Public bug reported:
Images rotated with jpegtran have rows or columns of pixels in the wrong place.
In particular:
- When rotating by 90 degrees some columns of pixels from the left are moved
to the right.
- When rotating by 270 degrees some rows of pixels from the top are moved to
the bottom.
- When rotating by 180 degrees both of the issues mentioned above affect the
output image.
Note that the words "top", "bottom", "left" and "right" always refer to
the image after the rotation.
Steps to reproduce:
1. Download a random jpeg image (e.g. the Ubuntu logo)
2. Rotate it with jpegtran (e.g. by 90 degrees)
3. The image is now rotated
Expected behavior:
4. Everything is in the right place
Actual behavior:
4. Some rows and/or columns of pixels are in the wrong place (as explained
above)
Tested package version: 2.0.3-0ubuntu1.20.04.1
System release: Ubuntu 20.04.1 LTS
** Affects: libjpeg-turbo (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1894403
Title:
Rows (or columns) of pixels appear in the wrong place after rotation
with jpegtran
Status in libjpeg-turbo package in Ubuntu:
New
Bug description:
Images rotated with jpegtran have rows or columns of pixels in the wrong
place.
In particular:
- When rotating by 90 degrees some columns of pixels from the left are moved
to the right.
- When rotating by 270 degrees some rows of pixels from the top are moved to
the bottom.
- When rotating by 180 degrees both of the issues mentioned above affect the
output image.
Note that the words "top", "bottom", "left" and "right" always refer
to the image after the rotation.
Steps to reproduce:
1. Download a random jpeg image (e.g. the Ubuntu logo)
2. Rotate it with jpegtran (e.g. by 90 degrees)
3. The image is now rotated
Expected behavior:
4. Everything is in the right place
Actual behavior:
4. Some rows and/or columns of pixels are in the wrong place (as explained
above)
Tested package version: 2.0.3-0ubuntu1.20.04.1
System release: Ubuntu 20.04.1 LTS
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/libjpeg-turbo/+bug/1894403/+subscriptions
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