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.