There is another issue about loseless jpeg: when I'm doing it, xnview tells me it gonna 'remove unused pixels) if its dimension is not a multiple of 8 pixels. But why to ask if the image IS a multiple of 8?
Thanks for the prog between
Let use jpeg loseless rotate every time it is possible
Moderators: helmut, XnTriq, xnview
Let use jpeg loseless rotate every time it is possible
I always used Shift+R to rotate a pic. Today I found another, jpeg losseless rotation with Ctrl+Shift+R. But why not to use this loseless rotation by Shift+R too? This will decrease count of entites in the program.
There is another issue about loseless jpeg: when I'm doing it, xnview tells me it gonna 'remove unused pixels) if its dimension is not a multiple of 8 pixels. But why to ask if the image IS a multiple of 8?
Thanks for the prog between
There is another issue about loseless jpeg: when I'm doing it, xnview tells me it gonna 'remove unused pixels) if its dimension is not a multiple of 8 pixels. But why to ask if the image IS a multiple of 8?
Thanks for the prog between
But...
If it is a jpg file, shouldn't the default rotation always be lossless? A warning about losing pixels and an opportunity to use "lossy" rotation is good, but I personally would never ever use "lossy" rotation.
So, my own preferred rotation logic for a single rotation command would be:
There could be an INI setting to "always perform lossless jpeg rotation" which would suppress the user prompt...
I think this is better for the casual unsophisticated user in order to protect the quality of the jpeg. Most users I know have no clue that jpeg is a lossy format or even what "lossy" or "lossless" mean.
If it is a jpg file, shouldn't the default rotation always be lossless? A warning about losing pixels and an opportunity to use "lossy" rotation is good, but I personally would never ever use "lossy" rotation.
So, my own preferred rotation logic for a single rotation command would be:
Code: Select all
If image is jpeg then
Evaluate jpeg lossless rotation
If jpeg lossless rotation causes lost pixels then
Explain and prompt user to choose lossless or lossy, etc.
Perform user choice
Else
Perform jpeg lossless rotation
Else
Perform "standard" rotationI think this is better for the casual unsophisticated user in order to protect the quality of the jpeg. Most users I know have no clue that jpeg is a lossy format or even what "lossy" or "lossless" mean.
John
Re: Let use jpeg loseless rotate every time it is possible
I agree with zencd's and JohnFredC's suggestion.
The rotation icons are still not the same as the "JPEG lossless transformation" => Rotate (a toolbar icon I discovered today), and I get the notification about 8-multiple trimming even for images with the proper dimensions that would need no trimming.
The rotation icons are still not the same as the "JPEG lossless transformation" => Rotate (a toolbar icon I discovered today
), and I get the notification about 8-multiple trimming even for images with the proper dimensions that would need no trimming.