I added new feature to spray – spraying bitmap images (textures). Thanks to the KDE you can load plenty of image formats. It starts with Qt QImage supported file formats and continue with KDE supported file formats (psd, xcf to choose the most used ones). Let’s be the mentor for you for a while and teach you how can you do nice things. Let’s start with autumn wallpaper.
You need svn copy of Krita (how to build koffice ) and some leafs textures (e.g. I used this one , found in wikipedia by Kubuntiac ). The texture has alpha channel, it is png file. That is important so that it looks cool. I scaled that texture to 192×118 px and named it leaf2.png.
Spraying bitmaps works nicely with objects that are cut from some pictures, e.g. some kde hackers on planet have their faces properly cut from photos. It is good example object for spraying.
In Krita you select spray brush and go to options. In Particle Type you select Spray object to image. Then you select the image within the dialog (Open The File, locate leaf2.png on disk and click ok). In brush size you can specify with particle number — how many images will be sprayed per dab (something like per mouse move event:) ) but what I changed there is spacing to 1.0, so that the brush reacts quicker and with less density. In Color dialog check random HSV and move hue to value 40, saturation to -40 and value leave intact. Here you can experiment. Experiment with scale and brush size too. Brush size can be changed by pressing shift and moving with mouse left and right on the canvas. It was added lately and it is quite handy.
Let’s look at some pictures. This autumn image was made with the leaf texture I mentioned above and one other leaf texture. HSV trasformation nicely changes the texture so you get rich colorful image with just one or two textures.
Filters can be useful when painting, here is post-processed version (I used auto-contrast filter). It has different mood, more like some cartoon, illustration style
And one for upcoming winter. I did this one with snow flakes. Those are used as textures. Clouds done with feature I wrote about last time.
This feature is present in other apps in some ways too. I don’t have Photoshop or Corel Painter, I never used them before but Boud told me that similar feature is called image hose in Corel’s Painter. In GIMP similar feature is called brush pipe.
I have to polish the GUI, optimize the algorithm so that more and big images can be sprayed more faster. I plan to improve the particle settings, add more control to rotation to the user’s hands (tablet support, etc. )
How do you see it? Do you like it? What would you add to the spraying of bitmaps?