RFXL Images
RFXL stores images for games, interfaces and small rendering engines. It keeps the decoder integer-based and offers exact source colours or deliberately reduced colour precision.
A little technical detail
RGB24 or RGBA32, with alpha stored only when needed. The encoder chooses between palette, planar, raster and sparse-screen representations, using prediction, run-length coding, Rice codes or LZSS. Five profiles trade colour precision for size.
Format definitionHistoryPureBasic modulePureBasic source bundleC sourceC headerJavaScript sourceC / JavaScript bundlePort contracts
Comparison & examples
A synthetic 65 × 65 RGBA image from the release corpus. The pictures show the existing decoded outputs, not a browser implementation of RFXL. PNG is an exact, lossless reference. Results on this tiny fixture are not a general compression benchmark.
| Representation | Download / size | Decoded preview |
|---|---|---|
| Original RGBA | 16,900 bytes | |
| PNG reference | 1,498 bytes |  |
| Lossless | 367 bytes |  |
| Mid | 322 bytes |  |
| Crappy | 423 bytes |  |
Encode & decode
Lossless preserves the browser's decoded RGBA pixels, not the original PNG file or its metadata. Images smaller than 64 pixels on either axis retain source precision. Processing stays in your browser.
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