⚠️ Note: This project is work in progress.

imj

An image library.

Features

• Full PNG support.
  • Without Adam7 interlacing.
  • Without CRC checks.
• Full BMP support.
  • Without embedded PNGs and JPEGs.
• Full GIF support.
  • Without animations. Only 1st frame is read.
• Full QOIF support.
• Full PNM support.

TODOs

• Use goto for error handling.
• JPEG support.
  • Baseline DCT
  • Progressive DCT
  • Understand the spec. (I had implemented a LONG time ago and forgot everything.)
  • Reset marker
• Fix includes in all files (some files have extra or deficient headers).
• Add support for following formats (in order of priority) -
  • WebP
  • ICO
  • PAM
• Add MSVC compilation support.
• Add Linux compilation support.

PNG

• All PNG bit-depths.
• CRC check.
• Fix memory leaks (if any).
• Adam7 interlacing.
• All bit-depths.
  • Generalized filtered stream reader.
    • Also handle 16-bit case.
• Proper transparency and alpha handling.
  • Fix broken alpha channel in 32-bit RGBA PNGs.
  • tRNS chunk.

BMP

• OS/2 BMP support.

QOIF

• edgecase.qoi fix.

GIF

• Ability to get all frames.

Exotic Image Formats to Learn About

• TIFF
• PCX
• ILBM
• TGA
• DDS
• SGI RGB
• OpenEXR
• YCbCr Raw
• YUV4MPEG
• CIE Lab TIFF
• Farbfeld
• PIC
• Radiance HDR
• JPEG variants -
  • JPEG LS
  • JPEG 200
• HEIF/AVIF