Lossless JPEG Rotation not Lossless

[Jaff]

Let's take those options:


and this image (82x61):


after 90 degrees rotation it will look like this (48x82 instead of 61x82): O.o


ok... let's try again another 90 degrees rotate


(80x48) OMFG! loseless rotate becomes a only 8x8 block rotate deleting non full 8x8 blocks?!?

/edit IV 4.22 was used

[Bhikkhu Pesala]

This is not a bug. Lossless rotation is only lossless if the image is a multiple of 16 pixels as it says in the help file:

Note: Lossless JPG operations like flip or rotate work only if the image height is a multiple of 16 (JPG specification). If this is not the case, unused image lines will be removed.

[Jaff]

Lovely :X. Then a warn dialog if image will be cropped is needed. Almost no one will look at image dimensions to see if it will be rotated without losing data