This is IMHO the other vital change needed for EXIF rotation.
It is clear from the many Support and Bug postings on EXIFs that something is needed.
There are 4 EXIF orientation tags recognized by IV - Top Left (0 deg), Left Bottom (90 deg), Bottom Right (180 deg) and Right Top (270 deg). The Auto-rotate option correctly displays the image upright for each of these. The image can also be rotated manually using either Options>JPEG Lossless Rotations or Image>Rotate.
In all cases it should be possible to either save the correct new (rotated) tag or to keep the original one. This is what one might expect the "Reset EXIF orientation" checkbox in the "JPEG save options" to do.
In fact at present after a lossless rotation the tag is always saved as Top Left regardless of the real value or of the checkbox setting. After a normal rotation the tag remains unaltered and is saved as such if the box is unchecked but again changed to Top Left in all cases if checked.
This is not going to get rid of all the confusion unfortunately. The lossless function rotates the original image, saves automatically and re-displays the result, whereas the normal rotation saves the image as displayed (auto-rotated) when selected but does not then re-display. The orientation can be quite a surprise when the new file is re-loaded. It might be wise to advise users always to turn auto-rotate off before performing a manual rotation /save and then back on afterwards. Another good reason for my previous request for making it much easier to turn it on and off.
It is clear from the many Support and Bug postings on EXIFs that something is needed.
There are 4 EXIF orientation tags recognized by IV - Top Left (0 deg), Left Bottom (90 deg), Bottom Right (180 deg) and Right Top (270 deg). The Auto-rotate option correctly displays the image upright for each of these. The image can also be rotated manually using either Options>JPEG Lossless Rotations or Image>Rotate.
In all cases it should be possible to either save the correct new (rotated) tag or to keep the original one. This is what one might expect the "Reset EXIF orientation" checkbox in the "JPEG save options" to do.
In fact at present after a lossless rotation the tag is always saved as Top Left regardless of the real value or of the checkbox setting. After a normal rotation the tag remains unaltered and is saved as such if the box is unchecked but again changed to Top Left in all cases if checked.
This is not going to get rid of all the confusion unfortunately. The lossless function rotates the original image, saves automatically and re-displays the result, whereas the normal rotation saves the image as displayed (auto-rotated) when selected but does not then re-display. The orientation can be quite a surprise when the new file is re-loaded. It might be wise to advise users always to turn auto-rotate off before performing a manual rotation /save and then back on afterwards. Another good reason for my previous request for making it much easier to turn it on and off.
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