BNG

Better Network Graphics / Borg Network Graphics

Under development

BNGView GUI for viewing (as well as exporting images to) BNG images
Layer compositing not implemented yet
Complete code refactoring and cleanup due
Low free memory modes utilizing temp files for processing as well as automatically reduced number of processing threads
Inter frame prediction for animation frames

Milestones

Multi threading completed. Will be optimized more, though.
Core components completed, except layer compositing.
GUI is available, but very bare and cannot save BNG yet. Only opening BNG files works (and it uses too much memory).

Supports:

Pixel formats: Gray/Alpha only, Gray with Alpha, RGB, YCrCb, CMYK, RGBA, YCrCbA, CMYKA
Bit depths: Integer(8, 16 BE, 16 LE) per channel, IEEE Float(32, 64) per channel
Animations with up to 2,147,483,648 frames with optional inter-frame prediction
Up to 2,147,483,648 named layers each frame with description for extended notes or others
Image data partitioning in tiles for files that don't fit in memory (NASA, hobby astronomy, etc.)
Compressed header and indexes
Compressed image data using PNG like predictors / pre-filters and entropy encoders (Brotli, LZW, ZSTD)
Multi threaded encoding and decoding using tiles
Fast save and load (depending on the compression used as well as image size, platform and processing power of the platform)

Issues

BNGView cannot open images with more than 8 bits per channel.