Add additional parameter to preserve png colormap.

[hicom150]

[BrunoCartier]

Hey,

Could you please explain what this feature does, why it is needed, and what are the consequences on the produced files?

Thanks.

[hicom150]

This option tells the PNG encoder not to optimize the palette and to preserve the exact colormap. In my case, I had a 32bit gray icon and the PNG encoder converted it to grayscale with not the exact same color. Thanks to this parameter I was able to get the correct output I was expecting.