[Digikam-users] How to crop a jpg lossless?

[Gerhard Kulzer]

On Friday 09 May 2008 Andreas Borutta wrote:
> Hi,
> 
> in the preferences of DigiKam 0.9.3 I see, that the kipi module for
> lossless editing is checked.
> 
> But I cannot find a command for lossless cropping of JPG.
> I remember that a feature of lossless cropping are 8px steps. Lossless
> cropping is not stepless.
> 
> Please could anyone give me a hint, how to crop lossless?
> 
> Another question:
> When I draw a frame for (normal) cropping: How could I move the frame.
> I do not want to change the size of the frame. It should just move.
> 
> Holding metakeys like shift, strg or alt or the right mouse key will
> do not allow to move the frame.
> Is there any way?
> 
> Thank you.
> 
> Andreas

Lossless cropping is not possible unless you crop to exactly 1/4 size or 1/16 and so on. This is a limitation of the underlying jpeg compression algo. Only lossless rotation is possible.

Best regards
Gerhard
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