Worker wgpu render pass → rgba32float readback. Nearest samples at origin, center and logical edge of every mip and cube face. Tolerance 1/255 per channel.
Non-4-aligned BC1 is a labelled synthetic 5×7 boundary, stored as 8×8. Shipped malformed logo_miles.dds is not uploaded or repaired. HDR readback is unclamped; display swatches clip.
| Source class | GPU format | Logical / storage | Layers / mips / probes | CPU RGBA | GPU RGBA | Result |
|---|
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