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May 9, 2017 at 9:57 comment added SztupY IrfanView also has an official lossless jpeg crop/rotate plugin
May 9, 2017 at 9:18 comment added Toby Speight For truly lossless transforms, you'll need to keep the output size to an exact multiple of JPEG's DCT cell size (8x8 pixels, I think). That's most important with rotations, as the cells are always aligned at (0,0), so you can't have a thin strip along the top or left edges - only the bottom or right.
May 9, 2017 at 5:51 history edited Dai CC BY-SA 3.0
added 100 characters in body
May 9, 2017 at 5:22 comment added llogan jpegtran is very useful. Also good for lossless optimization–sometimes with significant file size reduction.
May 9, 2017 at 4:01 history edited Dai CC BY-SA 3.0
added 55 characters in body
May 9, 2017 at 1:06 review First posts
May 9, 2017 at 3:43
May 9, 2017 at 1:05 history answered Dai CC BY-SA 3.0