User:0mtwb9gd5wx/JPEG image Lossless Transform

• Why You Should Always Rotate Original JPEG Photos Losslessly. PetaPixel (2012-08-14).
• en:XnView: has lossless rotation, freeware for private, educational and non-profit use
• en:FastStone Image Viewer: has lossless rotation, freeware for personal and educational use
• en:IrfanView can rotate losslessly, needs plugins installed, Proprietary, free for non-commercial use [1]

• check for plugin:

• Help -> Installed PlugIns
• look for JPG_TRANSFORM.DLL

• use lossless rotation with IrfanView:

• Options -> JPG Lossless Rotation
• (or press Shift+J)

• use lossless Crop with IrfanView:

• Options -> JPG Lossless Crop
• (or press Control+Shift+J)

• en:ExifTool has lossless rotation, en:free and open-source software

• exiftool -n -Orientation={n} image.jpg # Where {n} is a number between 1 and 8
• Orientation: 1 2 3 4 5 6 7 8 (Image)
• 1 = Horizontal (normal) en:Identity function [2]
• 2 = Mirror horizontal yaw axis en:Yaw (rotation)
• 3 = Rotate 180 roll axis
• 4 = Mirror vertical pitch axis
• 5 = Mirror horizontal and rotate 270 CW
• 6 = Rotate 90 CW
• 7 = Mirror horizontal and rotate 90 CW
• 8 = Rotate 270 CW

• en:jpegtran: en:free software permissive BSD attribution by Independent JPEG Group

• jpegtran -rotate 90 -copy all OLD.JPG > NEW.JPG
• -copy all (to include all EXIF data)

• programs that rotate JPEGs losslessly