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Images are converted to ARGB32 format, then each byte (ie: each pixel channel) in the read image is allowed to deviate by some specified amount from the corresponding byte in the expected image, to allow for rounding errors etc. By default, no deviation is permitted, but the XCF tests are allowed a deviation of 1, as the alpha blending can result in rounding errors (depending on whether hardware acceleration is used, for example). In the end, we are not too concerned about a small deviation that is invisible to the human eye. REVIEW: 116567