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EXIF orientation info in PNGs isn't used for image-orientation: from-image

(bugzilla.mozilla.org)
94 points justin-reeves | 1 comments | 21 Nov 25 13:29 UTC | HN request time: 0.327s | source
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donatj ◴[21 Nov 25 14:31 UTC] No.46004961[source]▶
Interesting. I was not aware that was a thing. Orientation info seems way less useful in a lossless format like PNG. It makes sense in JPEG for instance because rotating and re-encoding would be lossy and slightly degrade the image.
replies(6): >>46005026 #>>46005034 #>>46005049 #>>46005146 #>>46005413 #>>46010103 #
1. gpvos ◴[21 Nov 25 23:02 UTC] No.46010103[source]▶
JPEGs can be rotated losslessly as long as their size is a multiple of eight (or to be pedantic, the block size, which is usually eight).