CPC H03M 7/3059 (2013.01) [H03M 7/6005 (2013.01); H03M 7/6011 (2013.01); H04N 19/103 (2014.11); H04N 19/119 (2014.11); H04N 19/176 (2014.11); H04N 19/186 (2014.11); H04N 19/42 (2014.11)] | 20 Claims |
1. A lossy method of compressing data comprising:
for each of at least one sub-block of a block of pixels:
analysing an alpha channel value for each pixel in the sub-block to compress the sub-block using a compression mode which uses a fixed alpha channel value for pixels in the sub-block.
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