Any idea what's the difference between those two tga images? test.tga displays correctly in my image viewer, and t_c.tga is corrupted somehow. I got test.tga by opening and resaving t_c.tga with gimp.

I suspect that this is the cause:

https://en.wikipedia.org/wiki/Truevision_TGA#Specification_discrepancies

>The older version of the TGA file format specification
>"The packet may cross scan lines"
>TGA v2.0 specification states the exact opposite
>"Run-length Packets should never encode pixels from more than one scan line."

Not sure how to check it at the moment.

found this in test.tga, offset 0x586f6

ff 00000000 d8 00000000 ff 00000000 ff 00000000

it's confirmed, gimp saves according to the newer specification.




The strange thing is, t_c.tga starts with many zeroes and ends with garbage, while for test.tga it's opposite. Did gimp also flipped the image or something?

Yeah, t_c.tga is flipped. Offset 0x11, bit 5 is set, image is flipped vertically.




Not sure if I should try to fix the image generator, or search for a different image viewer. Not sure why I even bother.

Why even use tga? Isn't png superior compression-wise?

png is slower to decompress, and also is more complex. Not sure if that matters.