This is a great discussion. I'm always interested in other's approaches...
--- Ken Wimer said: --- 1) Create a basic 640x480 pic with the correct branding, etc. as vector. 2) scale that down to 640x400 3) add extra highlights, glow and shadows as appropriate 4) save a pic as 24bit png 5) change to indexed color (no dithering), 15 colors if you need to add a white or red for text purposes...save the file 6) open the colormap dialogue and swap colors where necessary to make it fit to the code...note that your pic starts looking funky really quick - save that with another name 7) open the pic without the adjusted colormap from step 5, select all, copy, and paste into the one from step 6 - gimp adjust the index stuff automagically 8) touch it up per hand as necessary (didn't go this far yet on the pics I posted on the wiki) --- Step 5 is possibly a weakness as well. While it seems logical to approach it this way, you are relying 100% on software to do the color crunch to 16 colors. You _might_ want to put in two repeating steps here and see if your quality increases: 5) Crunch 24 bit PNG to an indexed color image of varying size. If your image contains careful gradients and antialiasing colors (experience will tell), try shifting to indexed colors in phases. For example, you might try going to a 256 indexed color image, flip back to 24 and remove the anomalies. Then crunch to a 128 color, flip back to 24 bit and again touch up. Work your way down to 16 colors. It should almost always yield better results because you are using a human eye to firmly seat the image. 5.1) Once you get your image down to a 16 color palette, do the color mapping dialogue and shift your indexes so that they match up with the proper pre-defined usplash indexes. ( https://wiki.ubuntu.com/USplashCustomizationHowto?highlight=%28usplash %29 for more information.) 5.2) Take a step back to your original 16 color png, and re-adjust it via the mode dialog using the new palette. That theoretically SHOULD leave you with the best image possible. That said, you might hit the little compile bug that I have been getting. We should probably wikifize this once there is enough information gathered. --- Étienne Bersac said: --- 1. Create a 640x480 picture with Gimp 2. Export it to PNG. Convert it to 16 colors with Gimp (don't know how to order colors in the palette with the Gimp). Be careful about flat surface. manual retouch. etc. 3. Resize it to 640x400 with convert (i wish it keep the palette, but not sure) 4. pngtobogl it 5. build, link it, etc. --- Again, the step 3 relies on software to effectively try to 'guess' the best antialiasing color set. It might be more effective to work in a non square pixel environment (via the DPI settings) and visually ensure that the pixels are anti-aliasing efficiently. -- ubuntu-art mailing list ubuntu-art@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-art
