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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: 0.001s | 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. mavhc ◴[21 Nov 25 14:40 UTC] No.46005034[source]▶
Depends on whether the number of pixels is a multiple of the block size

https://www.betterjpeg.com/lossless-rotation.htm