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WPM Image
Robert Jordan edited this page Mar 17, 2020
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1 revision
The structure of this is not fully understood, or even encountered in the CatSystem2 assembly. This image format can be created from the WGC.exe in the CatSystem2 toolset.
| Data Type | Value | Description |
|---|---|---|
char[4] |
"WPM" | File Signature |
uint32 |
FileLength | Length of this file, excludes end padding |
uint32 |
Width | Width of the image |
uint32 |
Height | Height of the image |
uint32 |
CompressedLength | Compressed length of image data |
uint32 |
DecompressedLength | Decompressed length of image data |
| byte[CompressedLength] | ImageData | Zlib compressed image data, 1-byte blue channel |
| padding8 | Padding | Padding to 8-byte boundary of file end |
There seems to be nothing special about this image format. The uncompressed data contains just the blue channel bytes of the source image. Attempting to convert an image with all 0's in the blue channel will just yield black. There is no padding between scanlines.
It's possible using the blue channel is an old method for converting to grayscale. Because most images look fine when the blue channel is copied to red and green as well.