[digikam] [Bug 320107] Flip/Mirror operation doesn't flip/mirror the entirety of the picture (there is a strip left unmirrored)

[Gilles Caulier-4]

https://bugs.kde.org/show_bug.cgi?id=320107

--- Comment #32 from Gilles Caulier <[hidden email]> ---
To Christoph Feck, comment #5,

Did you know an implementation which do the stuff already somewhere ?

As i explain in comment #29, following tips from libjpeg team, we need to
handle chroma sampling factor to check if JPEG can be processed lossless.  If
we only check if image size is divisible by 8 is not enough.

Nicofo,

I also check if libjpeg/jpegtran CLI tool check chroma sampling factor, and
it's not the case.

So, the libjpeg team said that client applications must do the stuff instead to
do it in library, but libjpeg CLI tool do not include at least this kind of
check. So do what i said, but not what i do (:-)))...

At least my whish to see an UPSTREAM report here is not false to 100%. jpegtran
CLI tool must be fixed in this way.

Gilles Caulier

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