From blue sketch to digital in Krita

image data/images/blog/2014/08/removing-blue-sketch-lines-krita_00_by-David-Revoy.jpg
Spanish version available on Chalo Blogg.

This is a tutorial about the "traditional to digital" topic. You'll see all the step I use for drawing, scanning and cleaning my webcomic Pepper&Carrot
In the first part of the tutorial, I'll show you my choice for sketching, and 'inking' with pencil.
In the second part, we will scan the lines, and clean them in Krita to keep only the pencil artwork.
In the last part, I'll show how to tint the lines, and make them transparent to be ready to receive a full color work later.

The following tutorial is released under a Creative Commons Attribution License , and indirectly sponsored by my Patreons.

1. Warming up

I start every day with a sheet of A4 sketch at the same time I drink coffee at morning. I usually draw facial expression, then poses and sometime thumbnails. It's not meant to look 'good sketch'. I do it to be in sync with my volumes, and also break the stress to draw badly later on the day. This morning, a little thumbnail catch my attention [ under, outlined in orange ]. It's certainly a classic composition, or something a bit cliché for a run and jump pose ; but I wanted to see this one done with more details.

2. Guidelines

I take my reference on the side of my desk [1] and with a new sheet of paper I start drawing guidelines [2] . I keep them very light and subtle, with minimal pressure on my blue pen. I use Pentel Blue lead in 0.5mm. I tested also many other brands, and the Pentel are the one who suit more my taste and drawing style. You can see I trace large arc ; and keep the whole things undetailed. I'm looking for composition, and energy. My gesture are large, and I handle the pen also differently than usual to not draw with the wrist or finger, but involve the whole arm in the gesture.

3. Blue sketch

I keep drawing with my blue pencil, and add details. I'm doing my best to build the main volumes. I usually keep the shapes simple. I need to let room for still getting a bit of freedom on the next step. The goal is not to make a perfect blue sketch, then to just overwrite each one of lines. That would be just boring.

4. Erasing

With my kneaded eraser, I soft erase my blue sketch. Pentel blue lines are really hard to erase, so you don't risk to loose a part of the drawing definitely anyway. The purpose of this step is simple : make the sketch line easier to remove with Krita later, because they will be less dark ; and also bring comfort to my inking process. With a bright sketch, it's easier to see the rendering of your dark pencil lines.

5. Inking... well, without ink

I 'ink' my drawing with Stabilo lead pencil 0.5mm B , it's soft on my Bristol paper ; and allow me dark and light grey variations. it's also very precise.
Note : my Cintiq 21UX don't allow me to draw with this same precision. That's why I'm not using it. Pixels are too big, stylus too far from the surface, and stylus nib impact this glass at 5mm over the real surface. So impracticable for my style of inking.

'Inking' is over !

6. Scan

I scan on my Xubuntu 14.04 Linux desktop with Xsane, from the default package.
Note my super compact dark windows border theme for Xfce , I share it on my Github. My file manager is Nemo.
I can setup Xsane to just grab all the surface of the scanner, and save them as PNG 300dpi in color automatically on my disk.

7. Krita

I open my file in Krita ( version 2.8.5 from the Kubuntu update ppa ). The only modifications I made on my Krita install is the usage of a dark theme, and for the presets my last brushkit. Note for tester or developers : The raw scanned file is available at the end of this tutorial.

8. Cropping

I rotate my Image with Image > Rotate > Rotate image 90° to the right .
Then, I select the crop tool , and in the tool options ; I activate the 'Thirds' Decoration. This lines helps me to setup a better cropping.
I added over the screenshot here under green line to show you the composition lines I'm looking for.

9. Filter : Color Adjustment curves

Open Filter > Adjust > Color Adjustement curves, [1] and flatten the channel RED and GREEN [2] , [3] . Don't touch the BLUE one [4].
You should get a full Blue picture. By doing this, you'll merge the blue datas of your sketch into this ocean of blue ; and so, sort of removing them.

Protip :  Accelerate your workflow, save a preset for your filters the next time you need to use them. It works for all the filter in Krita. Press 'Edit Presets' on the top-right corner [1]. And then 'Bookmark current' [2]. Your preset will be added to the list [3] . You can also rename the item with a right-click (eg. here : "RGB->Blue only" is my name for this preset ).

10. Desaturate Max

Now, to remove all the blue in our artwork, call the Filter > Adjust > Desaturate , and use the 'Max' option in the list.

11. Tweak values with Levels

Open the levels, Filter > Adjust > Levels and move the little black triangle cursor where the histogram graph start to show datas [1] ; and clean all the white-grey noise [2]. When you scan paper, you usually get a little mountain in the histogram on the white part (right) to clean.
I also crop the black [3] because I want to avoid black pixels on my lines.

12. Manual cleaning

You have now time to just take a brush pick black or white color, and fix your artwork the digital way.  I don't use black, but a 90% black one, so I use my color history in the advanced color selector [1] to retrieve the color each time. I manually clean the dust, redo the line I didn't like, or deform and transform the whole drawing. I 'm drawing often with a little rake [3] and clean with a bigger preset, like my roller-brush [2]. For this artwork, I did only a classic dust-removal work, painting with white over all the little dark grayish stain .

13. Line-art coloring

Open the Filter > Adjust > HSV Adjustement, and start to click 'Colorize' [1] , then you can adjust the hue and the saturation [2]. I don't recommend to tweak the Lightness [3]. My taste here is for a dark Burnt Sienna . Save a Presets [read : chapter 9] if you need to find the exact same color setting next time.

14. Remove the white

In order to keep just our lines, we need to remove the white background. But our image is flat. A good filter to handle this is the Filter > Colors > Color to Alpha.
The default setting of this filter is to remove pure white, and the default threshold is perfect for this task.

15. Manage layers

We deleted the white background in our drawing and now we will create it again. But this time it will be on a separate layer under. For doing this, create a new layer, and put it just under our line-art. Fill it with White ( select white color, then go to Edit > Fill with foreground color ). Then rename the layers for making the project cleaner.

16. Save it

Just a little reminder : Save your artwork as *.kra .

17. Final line-art :

This is a low resolution of the cleaned line-art. If you want to get a look at the full resolution, download it (link at the end of the tutorial).

Summary :

This method to remove blue-lines looks maybe complicated and long because this tutorial is detailed with many notes and photos. But once you master it, it's a 3 min job. And you can repeat it easily across a pack of ten page of web-comics . The main infos to remind :
  1. Color adjustement curves and make Blue by flatting Red and Green channels ( 2 click with a preset )
  2. Desaturate Max ( 2 click with or without a preset )

Other part are just too easy in a workflow and make sens by themself  ( crop, contrast, remove alpha ).
From all the method I read (often about Gimp or Photoshop ) this is the fastest one for me, with the best results and centered around a single software, Krita. That's why I use it in production.

Conclusion :

Now our file is ready to receive a paint layer between our Bakground layer and our Lines.
Also, I have a method to color my artworks, but this will be for a next tutorial ! ( coming after Pepper&Carrot ep3 )

Source files :

* Raw scanner (PNG, 300dpi, Xsane)
* End *.kra files ready to color ( Krita 2.8.5, *.kra )
Download here : (11MB)

License :

This tutorial is indirectly sponsored by my 81 Patreons.
 Join them if you want to support me into the creation of free webcomics, free tutorials with cool license :-)

 Creative Commons License
This tutorial and the artwork is licensed under a Creative Commons Attribution 3.0 Unported License.

Links :

I recommend also you to read the exellent article : Removing blue lines from a drawing: The rise of the colour channels.  with Gimp and Krita by Wolthera van Hövell tot Westerflier.


  RamonMiranda - Reply

clap, clap, clap. Man i love your articles. Ellegance, easy to follow and well explained. chapeau

  Arn Sweatman - Reply

I've been following your amazing work for some time. And I believe you're getting EVEN BETTER!

  Dandy - Reply

Very nice! I've been meaning to do more sketching on paper lately, and this is a good encouragement.

I would like to download the source files to have a closer look (and perhaps have a try at painting with the finished lines, they look a lot of fun to work with) but it doesn't work for me. Is there somewhere else you could also upload them?
Thanks! :)

  Raghavendra Kamath - Reply

Thank you very much for this tutorial David,
i just switched to krita and was wondering how to lineart seperation.
thank you very much

  Andrew - Reply


nice tutorial! thank you!

Are you using Xubuntu regularly now? I remember that your os of choice was ubuntu gnome. :-)

  Adrienn Ecsedi - Reply

It was good to see your process. I like that you talk about even the smaller steps. Krita sadly is not running smoothly on my laptop, but I will give it an other go once I will have a new computer. I like the way I can paint with it.

I will try out the morning sketch routine you mentioned, it sounds good. :)

  Zubr - Reply

Now David Revoy with xubuntu and xfce?

  David REVOY OP , - Reply

@RamonMiranda : Thanks Ramon !

@Arn Sweatman : Oh good ! I'm working hard sketching every morning to still work on my skill. It's a long long work. I'm happy result start to be noticable. :-) thanks !

@Dandy : Source files are hosted on deviantArt Stash service ; it's usually a mainstream platform , does your country has restriction with deviantArt ? Sorry, sources files are big and I don't own a lot of room on my server to host them here.

@Raghavendra Kamath : Your welcome

@Andrew & @Zubr : True , Xubuntu since June 2014. UbuntuGnome 14.04 was a disaster for my use, because they ship a frankensteinish GNOME 3.10 with configpanel of 3.8 ; a big regression. And running the ppa for updating to 3.12 was really really unstable... I might be back to GNOME ; but it will be on Fedora or Manjaro. Xfce let me really fine tuning the desktop to my liking ; but I also need to do a lot of scripts to load advanced features manually ( xsetwacom , dispcal , dispcalGUI , wmctrl , etc... ). Not for beginner users :-)

@Adrienn Ecsedi : Ha, true Krita low CPU can be slow. Morning sketch routine is really a happy routine. Prepare to be invaded by drawings ! ( but it feels good to have a desk with a lot of drawing ). When I don't know what to draw ; I simply redraw something I already drew before, and try to improve pause, view angle, expression. Good luck!

  Zubr - Reply

David, write please install notes for xfce. Do you can install gnome-settings in xubuntu and use GUI for your wacom?

  David REVOY OP , - Reply

@Zubr : Oh, I already wrote them should be easy to translate them to an online document. ( I take my notes while installing my main workstation to boost my laptop install and also media center, and few PC around I admin )
No, I can't use Gnome-setting in XFCE ; the method might work while GNOME is 3.8 ( the one Unity, Mint and Ubuntu GNOME use ) but it will broke as soon as it will update to 3.10. This is because ; in my opinion ; GNOME team broke a UNIX rules somehow ; the one of modularity. In order to display full screen this beautifull widget to configure Wacom on Gnome 3.10 and after ; now Gnome settings require also the Compositor of GNOME ( I think Mutter ).
Here I use a plain *.sh script loaded at startup to load my wacom. It's based on xsetwacom command-lines and works good, because even if it 's more a pain in the ass to setup , it's has definitely more option than any GUI.
For color calibration, I use DispcalGUI a GUI for the dispcal cool module of the huge ArgyllCMS software. This also was a pain to learn. But now, I'm really 'desktop' independent.
14.04 is still a good base for package and hardware support ; and I feel the care in the update and support to make a long term support Linux. Xfce also don't change a lot ( other tweak , I use Nemo filemanager in Xfce ). The result is really really stable.
I would probably need to make "xsetwacom for cats" and "color-calibration with dispcalGUI for cats" before doing my release notes ; it's a big work. With my freelance clients, Pepper&Carrot and Gooseberry art-direction, I'm already completely mad about my schedule. I'll try to manage something.

  Zubr - Reply

And what about last version of cinnamon?

  David REVOY OP , - Reply

@Zubr : I tested during two days in mid august 2014 ; on Antergos ( Arch based ) so Cinnamon was really last package stable available vanilla. The last release posted on Segfault blog. I concluded I didn't like it for the reason Mint team forked the Wacom control center 3.8 , with all the bug and design issue about it ( can't assign a Shift or Ctrl or Super modifier to a button or stylus button, and problems with managing multi-monitors calibrations. ) . I waited years to see that being fixed in GNOME 3.10 / 3.12 ; so it's a bit a 'meh' problem to see this old problematic GUI back on the table and for Cinnamon own desktop environment , and for Unity too fork of Gnome Control Center.
Also, Cinnamon is not really flexible ( sure, more than GNOME ) and I found a lot of little details to be really workaround and features missing ( weird way to handle theme splitted between desktop and cinnamon ; problems with maintaining community themes , link broken ). I also saw the compositor or window manager to affect performance of digital painting ; just a little feeling to be 'off' while this similar issue was fixed in GNOME 3.10. So, I think Mint inherit from a lot of bad thing from the 3.8 GNOME period , and I'm not sure if they have the internal man power to fix it. They also don't really have an audience caring about gfx performance, color management, multi monitor and graphic tablet. So, not a lot of tester + dev team forking = risky , very risky to follow , in my opinion. Same for Unity.
I bug reported, to let hope the main issue will be fixed for a future use.
XFCE is a temporary solution. I made myself more like a DIY desktop, but I'm pleased with it , because it's stable, works, has good performance and got access to a pool of package interresting and easy to grab ( 14.04 ). I like the work done on GNOME ; and I'll probably switch to Fedora , because GNOME sounds problematic for a lot of distribution/respin to make it right ; Fedora is really starting to become GNOME OS, and that's not bad in a way.

  David REVOY OP , - Reply

@Zubr : Note about Cinnamon : I loved the 4 corner windows placement ( à la KDE ) and the option to put a permanent windows placed ( with Ctrl+Grab on a corner, if I remind well ) on a side of a screen. This is really cool windows management option. I had to add this to the previous post :)

  Zubr - Reply

I'm very like ubuntu and very like xfce. But i'm did not like xsetwacomsettings in console and wacom setting in gnome control center 3.12 is the best!

  David REVOY OP , - Reply

@Zubr : I *totally* agree. I love the Gnome-Control-Center ; and for Wacom, and for Color-management. It took me 4h to RTFM of Argyll and DispcalGUI and 2h to do various test to just get an idea of what setting I should enter and test variations of them.... while in Gnome, I color-calibrated my both screen in a brainless 20min ... ... Same for xsetwacom. That's why I doubt a 'xsetwacom for cats' is the right way. In a way , I prefer keep my workaroundish-xfce-buntu install for now and jump next Fedora and make a clean "Fedora install for digital painters" with Gnome 3.14. It can be better for community than showing again thousand of terminal lines of codes and workaround :-)

  Dandy - Reply

Thanks, I actually managed to download the file after a few days. I don't know why the problem happened.

As for desktop setups, I've recently been trying to go very minimal on my low-powered laptop, in an attempt to get more performance out of Krita (despite the laptop being below the recommended system specifications, it works OK), and I ended up using Openbox with just a few additions. I discovered that I can be lazy about tablet configuration because Krita handles it well enough on its own, although I don't get into colour management at the moment. How much extra use do you get from the more carefully configured approach?

  David REVOY OP , - Reply

@Dandy : Oh good for the file. This stash hosting file on my premium deviantArt account is really convenient for upload/download my source at the moment, and I was affraid to need to change service.

Openbox is a good choice, with really good performance and a lot of possibilities of customisation to setup the desktop in depht, and something I really like about it : even pixel-art precision desktop ( thin windows bar, sharp font, etc...). With wmctrl and script here and there ( community Manjaro open-box, or Archbang, or Crunchbang are famous to make top-notch Openbox cool scripts for windows placement, conky desktop decoration and other cool things with menu bars ).

Here, my extra configuration includes :
1. a wmctrl script to resize a windows on the fly to a bit less than 1/3 rd of the screen, and toggle to 2/3 ; I usually resize this way speedly references on side of the screen and keep 2/3 room for Krita to paint. It's a script I use mainly on laptop, on desktop workstation I added another screen.
2. my screen calibration are calibrated with dispcalGUI and the pantoneHuey colorimeter ; in a nutshell, I setup colors to be 6500K and Gamma 2.2. I played during a period to make the luminosity also constrain to 120 or 150 cd/m² ; but I saw my monitors were better using there native default luminosity/contrast setting ; so , they don't match about luminosity but match for the color temperature.
3. Xsetwacom ; I like to get ctrl or shift on the buttons, also / key ( it switch to previous preset used in Krita , and toggle to last used after, really time saving ) I also use the shortcut , comma for a color-selector.
4. A script to take screenshot with a crosshair on desktop, and save them on picture folder with YYYY-MM-DD_screenshot_HHMMSS.png name pattern.

And a propos xsetwacom, here are my scripts ; they are *really* simple and short, and manage keeping ratio between my screen and my tablet, and configuring extra button or mapping tablet to the monitor I want.

xsetwacom scripts for my Intuos 3 L :
#! /bin/bash
# INTUOS 3 Large
# max area : 0 0 60960 45720
xsetwacom set "Wacom Intuos3 9x12 pad" Button 1 "key KP_Divide"
xsetwacom set "Wacom Intuos3 9x12 pad" Button 2 "key Shift_L"
xsetwacom set "Wacom Intuos3 9x12 pad" Button 3 "key Control_L"
xsetwacom set "Wacom Intuos3 9x12 pad" Button 8 "key comma"
xsetwacom set "Wacom Intuos3 9x12 stylus" Button 2 "key ctrl"
xsetwacom set "Wacom Intuos3 9x12 stylus" MapToOutput "HEAD-0"
xsetwacom set "Wacom Intuos3 9x12 eraser" MapToOutput "HEAD-0"
xsetwacom set "Wacom Intuos3 9x12 pad" MapToOutput "HEAD-0"
areaY=$(( $screenY * $areaX / $screenX ))
xsetwacom set "Wacom Intuos3 9x12 stylus" Area 0 0 $areaX $areaY
xsetwacom set "Wacom Intuos3 9x12 eraser" Area 0 0 $areaX $areaY

xsetwacom scripts for my Intuos 4 Medium :
#! /bin/bash
# INTUOS 4 Medium
# max area : 0 0 44704 27950
xsetwacom --set "Wacom Intuos4 6x9 pad" Button 1 "key exclam" #ring
xsetwacom --set "Wacom Intuos4 6x9 pad" Button 2 "key z"
xsetwacom --set "Wacom Intuos4 6x9 pad" Button 3 "key y"
xsetwacom --set "Wacom Intuos4 6x9 pad" Button 8 "key colon"
xsetwacom --set "Wacom Intuos4 6x9 pad" Button 9 "key semicolon"
xsetwacom --set "Wacom Intuos4 6x9 pad" Button 10 "key w"
xsetwacom --set "Wacom Intuos4 6x9 pad" Button 11 "key shift"
xsetwacom --set "Wacom Intuos4 6x9 pad" Button 12 "key e"
xsetwacom --set "Wacom Intuos4 6x9 pad" Button 13 "key m"
xsetwacom set "Wacom Intuos4 6x9 stylus" button 2 "key Control"
areaY=$(( $screenY * $areaX / $screenX ))
xsetwacom set "Wacom Intuos4 6x9 stylus" Area 0 0 $areaX $areaY
xsetwacom set "Wacom Intuos4 6x9 eraser" Area 0 0 $areaX $areaY

xsetwacom scripts for my Cintiq 21UX : ( note: with auto shutdown laptopscreen )
#! /bin/bash
# max area : 0 0 87200 65600
xsetwacom set "Wacom Cintiq 21UX pad" Button 1 "key KP_Divide"
xsetwacom set "Wacom Cintiq 21UX pad" Button 2 "key Shift_L"
xsetwacom set "Wacom Cintiq 21UX pad" Button 3 "key Control_L"
xsetwacom set "Wacom Cintiq 21UX pad" Button 8 "key comma"
xsetwacom set "Wacom Cintiq 21UX stylus" Button 2 "key ctrl"
xsetwacom set "Wacom Cintiq 21UX stylus" Area 327 374 86436 65171
xsetwacom set "Wacom Cintiq 21UX eraser" Area 327 374 86436 65171
xsetwacom set "Wacom Cintiq 21UX stylus" MapToOutput VGA1
xsetwacom set "Wacom Cintiq 21UX eraser" MapToOutput VGA1
if xinput --list | grep -q Cintiq; then
echo "*Note : Cintiq connected, shutting laptop screen"
xrandr --output LVDS1 --off
echo "*Note : NO Cintiq connected"

xsetwacom scripts for my Bamboo fun A5 :
#! /bin/bash
# max area : 0 0 21648 13530
xsetwacom set "Wacom BambooFun 6x8 pad" AbsWUp "core key -"
xsetwacom set "Wacom BambooFun 6x8 pad" AbsWDn "core key +"
xsetwacom set "Wacom BambooFun 6x8 pad" button 1 "core key Control z"
xsetwacom set "Wacom BambooFun 6x8 pad" button 2 "core key e"
xsetwacom set "Wacom BambooFun 6x8 pad" button 3 "core key Control y"
xsetwacom set "Wacom BambooFun 6x8 pad" button 4 "core key b"
xsetwacom set "Wacom BambooFun 6x8 stylus" button 2 "core key Control"
areaY=$(( $screenY * $areaX / $screenX ))
xsetwacom set "Wacom BambooFun 6x8 stylus" Area 0 0 $areaX $areaY
xsetwacom set "Wacom BambooFun 6x8 eraser" Area 0 0 $areaX $areaY

  Dandy - Reply

Ah, of course, the buttons on the tablet! For whatever reason I don't usually find those to be in a convenient position, so I tend to forget they're there. The screen ratio is also a good point -- I'm probably causing trouble with my drawing by having a mismatch between my tablet and the screen. I'll have a go at setting mine up more properly, it doesn't look like it should be too difficult.

  Zubr - Reply

David, your wacom intuos 4 m is without led?

  David REVOY OP , - Reply

@Dandy : oh yes, a mismatch of ratio can affect drawing skill (eg. you draw a perfect circle on tablet, and an ellipse appear on screen. ) Having ratio matching is highly recommended :-)

@Zubr : The tablet has, and I was one of the first to get them to work on Linux even back in 2011 ; ( … -linuxmint ) . Nowaday, I don't really mind to see them turn-off ; but I love the way GNOME after 3.10 handle this automagically with cool labels. Another cool thing Ubuntu-Unity and Cinnamon-Mint ( and Elementary-Pantheon ) will never know because they lasy-forked an old 3.8 version and I guess they'll can't update to the 3.10 or 3.12 without breaking things on their side ; so they are in a bad situation about this. But , in my opinion the wacom audience is so little that having something semi-functionnal is OK for the dev teams :-/

  Leonardo - Reply

Hi :)
I fell so much in love with just this simple sketch that I tried to make a wallpaper out of it! Hope you like it :) … wallpaper/

  David REVOY OP , - Reply

@Leonardo : wow, that's a lot of colors :-) thank you for sharing the link, I like to see creative derivation from my artworks. And thank you for linking my sketch!

  Tharinda Divakara - Reply

Wow! It's very useful article. I tried to take my paper line work from my digital camera instead of using a scanner, but it has low DPI (72 Dots per inch). I think we need at least 300Dpi to create good painting.
It's glad to see another tutorial. Have a nice day!

  David REVOY OP , - Reply

@Tharinda Divakara :Thanks ! ha yes, digital camera produce too much noise to do clean result for artworks. By the way, my scanner is dying here ( a lot of band noise start to appear on my scan ) I have to replace it soon. It will be hard to find a cheap one with good performances and compatible plug&play with XSane.

  Aurélien - Reply

Thanks a lot for these detailed explanations!

I am curious about one thing though: why do you say in step 11 that you don't want black pixels?

  David REVOY OP , - Reply

@Aurélien : Hi Aurelien ! ;-)
There is often a large visual gap between 0% black pixels and 1% dark-dark-grey. It really makes the pure black pixels appear sometime to be outside the picture. Just a personal feeling. So, I prefer to keep my dark shade away from pure blacks when I start an artwork. It's easier to contrast later if I need to get rich black back.

  Aurélien - Reply

Interesting. I think I hit a similar issue while drawing for my game but since I mostly draw with flat shapes I ended up using darker versions of the shape color for the outlines. It's unfortunately a bit more painful to draw that way with Inkscape, I'll try dark-grey outlines next time :)

  David REVOY OP , - Reply

@Aurélien : oh, btw congratz for your game visual ; I follow the screenshot on G+ ; and you really improved a lot !

  Aurélien - Reply

Thanks! Coming from you, it means a lot to me!

  Eswri - Reply

Good article, thanks !

  Tanjung - Reply

Thank you for the tutorial! It can be hard finding good Krita tutorials as good as yours.

Also, have you ever tried MyPaint for digital painting? It's also a free software that runs in Xubuntu. Krita has better features in my opinion, but I like MyPaint's unlimited canvas feature. Would really appreciate it if you could somehow make a tutorial using MyPaint! If not, I'm happy enough to keep stalking your Krita tutorials ;-)

  David REVOY OP , - Reply

@Tanjung : hey thanks ;-)
For Mypaint feel free to check 'Media attention' or also the about box of the software ;-) I had a quite long love affair with Mypaint.
You can find ressources on my blog ; type 'mypaint' in the search box , and you'll get article, brushes, video :)
Nowaday, the project is a bit sleepy and I prefer invest my time on Krita , also the GTK3 version of Mypaint UI removed a bit of the fun for me and broke features of the software. I guess on Xubuntu they still package the 1.1 version so it's fine.

  Kasha Norman - Reply

Thanks for the tutorial !

  Apropos of Nothing - Reply

This is one of the best tutorials I've come across to date. Thank you for sharing your process!

  Jannatul Shumi - Reply

I have a great fascination for sketching artwork! Oh now my duty is to follow your tutorial to make such sketch!

  enamul hoq - Reply

wonderful tutorial, thank you for sharing with us .keep it up

  Nahidul Ehsan - Reply

This is really great work. I have seen very few creative tutorial like this one. Thanks for sharing the tutorial.

  Mimosa - Reply

Dear David!
It is incredible how generous you are. Thank you for sharing your knowledge, you inspire me!
You're awesome

  Lorena - Reply

Hey, what if I use nankin instead of pencil? It could be a problem?

  David REVOY OP , - Reply

@Lorena : I'm not familiar with Nankin ; from a speed search it looks to be a black pen. No problem for black pen ; cleaning is even easier with the contrast than pencil.

  SAM - Reply

Wow! This was simply amazing. Thank you for sharing your positive feedback with us!

  Tents for sale - Reply

Amazing tutorial. thanks a lot for sharing

  Rakhibul - Reply

Great Tutorial! I'm sure you understand, sometimes you get into a rut where nothing works and everything looks awful.
This design was fantastic and opened my eyes to trying something different and unique.
The techniques you described were simple to implement but extremely effective and creative. Great job! I really loved it!!

  Md Razaul Karim - Reply

Your work is really awesome. Your method is easy to me and I follow this. Thanks for sharing.....................

  Mishkat Islam - Reply

Really you have done a good job. I am impressed , I will follow your tutorial. Thanks for sharing

  robert - Reply

Great Tutorial! I'm sure you understand, sometimes you get into a rut where nothing works and everything looks awful.
This design was fantastic and opened my eyes to trying something different and unique.
Great job! I really loved it!!

  Salim Ahmed - Reply

Really your tutorial help be success to related this work. Thanks for sharing a brilliant post. g

  Alex - Reply

Where do I get this pencil? I've looked online and I can't seem to find a .5mm B anywhere. Although I can find HB.

  David REVOY OP , - Reply

@Alex : Hi, I just checked on my desk ;

The mechanical pen I use Stabilo technic 0.5 :

( I put fabric-black-tape on it to improve the comfort )

The mechanical lead box I have got this on label ( french ) :
"STABILO mines B
0.5 60 mm x 12 pces"
I tried to google for them, and I didn't found them.
Probably something I bought to my local art store long time ago.
You can fallback on 'Staedler Mars micro carbon', I think it might even be better quality than Stabilo :

  Jack Hunter - Reply

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This is so amazing. Im still overwhelmed by all the info here, being a novice at digital painting sometimes instruction flies high above my head =P ... im just so thankful for people like you , who are willing to share their knowledge in such a generous manner. You have a fan for life!

  David REVOY OP , - Reply

@artfulbutterly : A big thank you !

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  زومر - Reply

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