[gdal-dev] Possible RGB 16-bit PNG read error?

[Ray at Daylon]

I came across a 16-bit RGB PNG file that appears to read incorrectly in 
GDAL 3.11.3. I didn't see any changes in the readme's for later GDAL 
versions in regards to this.

The file content is okay but the colors are wrong. Looking at the band 
pixel data returned by GDAL, it might be similar to the endian issue 
that happened with 16-bit grayscale PNGs earlier, but applying endian 
corrections and RGB/BGR ordering on my end didn't help. Near as I can 
tell it looks like the channels are shifted in some other way.

An example file is available at
daylongraphics.com/download/test/gdal_png_issue/48bpp.png (554K)

For reference, a correctly read 8-bit version is available at
daylongraphics.com/download/test/gdal_png_issue/24bpp.png

Ray Gardener
Daylon Graphics Ltd.