| PNG Images |
| ========== |
| |
| Please run src/tools/resources/optimize-png-files.sh on all new icons. For example: |
| tools/resources/optimize-png-files.sh -o2 new_pngs_dir |
| |
| If this script does not work for some reason, at least pngcrush the files: |
| mkdir crushed |
| pngcrush -d crushed -brute -reduce -rem alla new/*.png |
| |
| ICO Images |
| ========== |
| |
| Windows ICO icons should be in the following format: |
| |
| * A square image of each size: 256, 48, 32, 16. |
| * The 256 image should be in PNG format, and optimized. |
| * The smaller images should be in BMP (uncompressed) format. |
| * Each of the smaller images (48 and less) should have an 8-bit and 32-bit |
| version. |
| * The 256 image should not be last (there is a bug in Gnome on Linux where icons |
| look corrupted if the PNG image is last). |
| |
| If you are creating an ICO from a set of PNGs of different sizes, the following |
| process (using ImageMagick and GIMP) satisfies the above conditions: |
| |
| 1. Convert each of the smaller images to 8-bit. With ImageMagick: |
| |
| for f in FILENAME-??.png; \ |
| do convert $f -dither None -colors 256 \ |
| png8:`basename $f .png`-indexed.png; \ |
| done |
| |
| 2. Combine the images into an ICO file. With ImageMagick: |
| |
| convert FILENAME-256.png FILENAME-{48,32,16}{-indexed,}.png FILENAME.ico |
| |
| 3. Unfortunately, the 8-bit images have been converted back into 32-bit images. |
| Open the icon in GIMP and re-export it. This will also convert the large |
| 256 image into a compressed PNG. |
| 4. Run src/tools/resources/optimize-ico-files.py on the resulting .ico file. |
| |
| You can also run src/tools/resources/optimize-ico-files.py on existing .ico |
| files. This will convert BMPs to PNGs and run a basic PNG optimization pass, as |
| well as fix up any broken image masks (http://crbug.com/534679). |