Comment 20 for bug 118089

I did some investigating, not sure this info will help though, as I was unable to pinpoint the crucial difference.

Definitely doesn't affect it: Interlacing

The correct and incorrect images are actually quite different in composition. The correct one is:

- DirectClass
- Grayscale
- Gray alpha
- Has a white background color

While the incorrect one is:

- Pseudomap
- Grayscale
- Gray alpha
- Uses a colormap that's 256 large
- Has a non-standard resolution
- Has a rgb(1,1,1) background color.

The incorrect logo image is:

- Directmap
- RGB with 8-bit channels
- Transparent Alpha
- White background color

When I convert the logo image to grayscale using Irfanview, then the image prints properly. When I convert it to monochrome using ImageMagick, it still fails to print properly. I note that the latter used a colormap, the former did not. In fact, the monochrome version of the logo is extremely similar to incorrect image due as: both use PseudoClass and a color map. The only substantial difference is that while the incorrect image has 8-bit gray and 1-bit alpha, the incorrect monochrome logo image has 1-bit gray and 8-bit alpha.

Unfortunately, I still have been unable to get correct printing for RGB color PNGs with transparency. Can anyone else help?