Can someone help me report this bug?

[Drachenbauer]

(11-23-2022, 08:19 AM)Ofnuts Wrote: Probably not a bug. The color-indexed mode of Gimp is designed after the GIF standard, even if you export to PNG. So

1. Pixels are either opaque or transparent, there is no partial alpha while color-indexed PNG supports it a
   
2. There is an additional color in the palette that is flagged as the "transparent" color and all pixels that are encoded with the index of that color are assumed to be transparent. AFAIK this is inserted as the first color in the color map, with all RGB channels to 0, so it would be black if opaque.
   

So I assume that the additional color is the one added for transparency support.

to 1. i uns no semi transparencies in my actual graphics.
to 2. It looks like this extra color is somehow choosen somehow randomly and if it´s black, the black pixels in the graphic turn to transparent.

I noticed, even if gimp imports a graphic with black switched to transparent, another application shows the graphic correct.
So i think the issue must happen while importing it.

Why i use indexed png#s:
I like to have a specific set of colors in my pixelart, about 4-8 different precisely choosen colors.
if i now play around with a non indexed gimp, sometimes there appear extra colors, wich are slightly different to my wanted ones, wwat i can see on the index palette, if i activate this modus with the first option.
if i work with the indexed modus, i can prevent this from happening