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zaokeng_slope.png (16,283 bytes) slope.png (17,410 bytes) |
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Well, "identify" is right and wrong. The second file is not rgba, it is rgb with extra transparency information in a "tRNS" chunk. Effectively this means that both files contain alpha info, but they are encoded differently. file(1) only looks at the IHDR section and does not do further processing to see if there are any other chunks. While we can make file(1) smarter about png files by parsing more of the png-file and all the additional chunks, and print additional information about it, it hardly seems worth-while. For reference: https://en.wikipedia.org/wiki/Portable_Network_Graphics |
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(I was trying to scan for all files that would trigger https://bugs.chromium.org/p/chromium/issues/detail?id=991197 .) (OK, as you understand the issue perhaps you should file an Imagemagick bug.) |
- Anonymous
