ptag is a high speed image viewer, with the ability to adjust EXIF ratings, captions and orientation. No direct image manipulation is done - only EXIF data is modifed.
The EXIF data can be stored in different formats or files e.g embedded in the image file itself, or in sidecar files.
ptag will preload images ready for viewing so that image display is fast.
The fyne toolkit is used for window management and display, and the vips library for image handling. The exiv2 tool is used to read and save the EXIF data.
Run ptag --help to get the usage and keyboard shortcuts supported.