HG‐X ProcessImage

Encoding: HG Image

The HG image encoding used by the HG-3 and HG-2 formats (.hg3, .hg2).

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The encoding process is a bit lengthy, and shares some similarity to the PSVita CSX image formats. The primary methods used are:

• Zlib compression
• Elias Gamma coding
• Zero-run length encoding
• Weighted table normalization
• Absolute signed values
• Delta filtering
• Image slicing (never used, but supported by HG-3)

In addition, the following are used before the encoding or after the decoding process.

• Crop transparent borders
• Vertically flip pixel data (as used in Bitmap image format)

This is the method used to convert standard HG-2 and HG-3 image unrle data and cmd bits into pixel buffers.