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838 are stored in the same format/depth as the image data in a bKGD or tRNS
860 transparency information in a tRNS chunk. This is most useful on
879 added. It expands the sample depth without changing tRNS to alpha.
885 the tRNS chunk is present, A means an alpha channel is present, and O
886 means tRNS or alpha is present but all pixels in the image are opaque.
935 alpha channel (or the tRNS chunk data) after it's read, so that 0 is
947 If you do this, any input with a tRNS chunk will be expanded to
2191 other transformations because in the case of paletted images the tRNS
2192 chunk data has to be inverted before the tRNS chunk is written. If
2193 your image is not a paletted image, the tRNS data (which in such cases
2470 structure and continue to use the PLTE, tRNS, and hIST data in the write
2974 tRNS chunk to alpha. The png_set_gray_1_2_4_to_8() function is
3037 which also expands tRNS to alpha was replaced with