PNG validator and fixer for pngs in the expansion

[hedara90]

Description

Currently gbagfx is generating errors bit continuing anyway if the errors don't affect the finished .4bpp image. Some images also contain unnecessary data such as EXIF and embedded thumbnails among others. EXIF data might also contain identifiable information about whoever created the png. All data except for the header, IHDR, PLTE, IDAT and IEND is extraneous and might hide problems with the image when opened in editors. For example the tRNS chunk might hide an improperly colored background.

Either integrating a validator/fixer into gbagfx or writing a new tool would work.

Things found so far in PNGs don't have to be there:

• Embedded thumbnails (larger than the actual image itself)
• Which editor/tool that created the PNG
• Excessive palette sizes
• tRNS chunks, transparency data
• orNT chunks, rotation data
• bKGD chunks, background color, not compatible with how background are handled

Discord contact info

hedara

[Bassoonian]

I think gbagfx improvements would be warmly welcomed over at pret