Note that the pixel data is stored upside-down. I see 07 wherever a transparent pixel would be, and the corresponding colour in the palette is #C0C0C0. I'm guessing that transparency is handled as you guessed. The 0x07 will make that pixel use the 8th colour in the palette, which is #C0C0C0 and the 0x18 will make that pixel use the 25th colour in the palette, which is #CECECE. For example, the first few bytes are 07 07 18 18. It's simple: one byte represents one index in the palette. Each colour is 4 bytes, in BGR_ format (the fourth byte isn't used if it was an alpha channel, you would see FF instead of 00). After the "BM" there is a 52-byte header, a palette of 256 colours, and the indexed pixel data. This is an 8BPP (8 bits per pixel) indexed bitmap. This is how the header of the first bitmap above looks:Īny idea? Just knowing what format this is would be enough. It is also fairly large, having more than 5 bytes per each pixel represented (!). (or, it has binary transparency, and #C0C0C0 means transparent). NewFile openFile saveFile saveAll closeFile closeAll Īs you can see, they have a grey matte, which makes me think the alpha channel is stored in the format in some non-standard way.
Sample of the bitmaps can be found in the Notepad++ repository: So I'd like to ask, which format are these files in, and how can I produce them? They seem to be in bitmap format, which is weird because they have transparency, and replacing them with any "Bitmap" ( BM header, "Windows Bitmap") format I know of doesn't work (the icon isn't shown). exe with Resource Hacker, and see where the icons were. However, I'd like to change its icons, just for customization sake really. I'm using Notepad++ to do most of my coding currently.
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