Dear, FLTK developers.

I've been found an issue for Fl_PNG_Image cannot read some PNG files of this condition with @fire-eggs with this issue ( rageworx/fl_imgtk#16 )

• If PNG is grayscale image up to 8bit depth with has alpha channel ( transparency bits ),
• Fl_PNG_Image recognized this image as 2 depth ( as RGB555, or RGB565 ).

So I tested with my own clonned Fl_PNG_Image to solve this issue here.

• https://github.com/rageworx/fltk-1.3.5-2-ts/blob/v1.4.0-dev/src/Fl_PNG_Image.cxx

If alpha channel existed, array converting to RGBA, then process to each graphics driver.
My Fl_PNG_Image may not the best choice, but it should be make it better to load PNG images.

Regards, Raph.K.

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