ASTC 6x6 HDR: astcenc ‐thorough ‐exhausive vs. basis universal comp_level 3

Each LDR sRGB test image was converted to linear light RGB (a sRGB->linear conversion), scaled to a luminance of 100 nits (typical SDR monitor brightness is 80-100 nits), saved as .EXR and then compressed with the two compressors (latest ARM astcenc command line vs. basisu ASTC HDR 6x6). Each compressor's ASTC output was then unpacked to half float and then converted back to SDR sRGB (by dividing by 100 nits and applying the linear to sRGB transfer function), then saved to .PNG for easy viewing on the web.

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ARM astcenc exhaustive:

basisu:

original image:

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ARM astcenc exhaustive:

basisu comp_level=0 (fastest):

original image:

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ARM astcenc exhausive:

basisu comp_level=0 (fastest):

original image:

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ARM astcenc exhaustive:

basisu:

original image:

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