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arrow edited this page Jun 7, 2026 · 8 revisions

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WIMF: Worst IMage Format

This project is an image format that seems to have no use for now. It is built for people who want high-precision data storage, even if no standard software opens it yet

How does it work?

It uses actual math instead of just guessing pixels:

  • Haar Wavelet Engine: Multi-level frequency layers. It prioritizes image structure over noise. When you compress it too much, it fails with painterly blurs instead of square JPEG blocks
  • Reversible YCoCg-R: A high-efficiency color transform that provides better decorrelation and color accuracy than standard YCbCr
  • Variable Bit-Depth: Fully supports 8-bit, 10-bit, and 16-bit pipelines. Good for HDR10 and professional photography
  • LZMA Entropy Coding: Deep dictionary-based compression for maximum data density

Features

  • Progressive Loading: Chunked Bitstream structure allows for the low-resolution image to improve gradually as the file loads
  • Self-Healing (Anti-Rot): XOR parity blocks can repair the file if your hard drive starts dying
  • "True" ROI Decoding: Extract specific 512px regions from giant images without decoding the whole file
  • Chrono-Layers: Store your undo history in one file so you can see how an image changed over time
  • Watermarking: Hide invisible text secrets directly within the frequency layers

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