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Fix formatting and improve clarity in README.md

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Rich Geldreich
2026-02-26 20:31:59 -05:00
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@@ -98,13 +98,13 @@ The ASTC HDR decoder, used in the transcoder module, supports the entire ASTC HD
5. **UASTC HDR 6x6 Intermediate ("GPU Photo HDR")**: A custom compressed intermediate format that can be rapidly transcoded to ASTC HDR 6x6, BC6H, and various uncompressed HDR formats. The custom compressed file format is [described here](https://github.com/BinomialLLC/basis_universal/wiki/UASTC-HDR-6x6-Intermediate-File-Format-(Basis-GPU-Photo-6x6)). The format supports 75 unique ASTC configurations, weight grid upsampling, 1-3 subsets, single or dual planes, CEM's 7 and 11, and all unique ASTC partition patterns. One of the first HDR GPU texture codecs supporting the [delta E ITP (ICtCp) colorspace metric](https://www.portrait.com/resource-center/about-deltae-e/) and perceptual saliency maps.
6. **Standard ASTC LDR-4x4-12x12**. Supports all standard 14 ASTC block sizes. Transcodable from any ASTC block size to any other supported LDR texture format with adaptive deblocking, including BC7 using the [bc7f "one-shot" analytical BC7 encoder](https://github.com/BinomialLLC/basis_universal/wiki/Transcoder-Internals-%E2%80%90-Analytical-Real%E2%80%90Time-Encoders) (supporting all BC7 modes/features) and ETC1 (using etc1f, which also supports the entire ETC1 format).
6. **Standard ASTC LDR-4x4-12x12**. Supports all standard 14 ASTC block sizes. Transcodable from any ASTC block size to any other supported LDR texture format with adaptive deblocking, including BC7 using the [bc7f "one-shot" analytical BC7 encoder](https://github.com/BinomialLLC/basis_universal/wiki/Transcoder-Internals-Analytical-Real-Time-Encoders) (supporting all BC7 modes/features) and ETC1 (using etc1f, which also supports the entire ETC1 format).
The ASTC LDR decoder, used in the transcoder module, supports the entire standard ASTC LDR format (i.e. not just ASTC texture blocks generated using our encoder). The ASTC LDR transcoder can transcode any block size ASTC (4x4 - 12x12) to the other LDR texture formats.
7. **XUASTC LDR 4x4-12x12 ("GPU Photo LDR/SDR")**: Supercompressed ASTC with **Weight Grid DCT**, supporting all 14 standard ASTC block sizes, with adaptive deblocking when transcoding to other texture/pixel formats. Bitrates range from approximately 0.3–5.7 bpp, depending on content, profile, block size, windowed RDO, and Weight Grid DCT quality settings. Typical XUASTC LDR 4×4 (**8 bpp in memory**) transmission/on-disk bitrate with Weight Grid DCT (where it is least effective) is **1.15–3.5 bpp (typical ≈2.25 bpp)**, with larger block sizes achieving even lower usable bitrates, down to approximately 0.3 bpp. Like ASTC LDR, the XUASTC LDR transcoder can transcode any block size ASTC (4x4 - 12x12) to the other LDR texture formats, but with additional block-size specific optimizations.
Supports three profiles: context-based range/arithmetic coding (for higher compression ratios), Zstd (for faster and simpler transcoding), or a hybrid profile using both approaches. Transcodable to all other supported LDR texture formats, including fully featured (all 8 modes, all dual-plane channel configurations, all mode settings) BC7. Certain common block sizes (4×4, 6×6, and 8×6) have specializations for particularly fast transcoding directly to BC7, bypassing analytical BC7 encoding (using [bc7f](https://github.com/BinomialLLC/basis_universal/wiki/Transcoder-Internals-%E2%80%90-Analytical-Real%E2%80%90Time-Encoders)) entirely for the most common ASTC configurations (solid color and single-subset CEMs).
Supports three profiles: context-based range/arithmetic coding (for higher compression ratios), Zstd (for faster and simpler transcoding), or a hybrid profile using both approaches. Transcodable to all other supported LDR texture formats, including fully featured (all 8 modes, all dual-plane channel configurations, all mode settings) BC7. Certain common block sizes (4×4, 6×6, and 8×6) have specializations for particularly fast transcoding directly to BC7, bypassing analytical BC7 encoding (using [bc7f](https://github.com/BinomialLLC/basis_universal/wiki/Transcoder-Internals-Analytical-Real-Time-Encoders)) entirely for the most common ASTC configurations (solid color and single-subset CEMs).
Weight Grid DCT can be disabled; however, supercompression remains available with optional, configurable windowed RDO. Compatible with all major image and texture content types, including photographic images, lightmaps, albedo/specular textures, various types of normal maps, luminance-only maps, and geospatial mapping signals.