TIFF reader: properly support ASSOCALPHA
we need to dis-associate the r/g/b values in this case.
Was spotted with this libwebp issue: https://bugs.chromium.org/p/webp/issues/detail?id=401 (see the test.tiff sample)
we need to dis-associate the r/g/b values in this case.
Was spotted with this libwebp issue: https://bugs.chromium.org/p/webp/issues/detail?id=401 (see the test.tiff sample)