Re: lossless rotation in konqueror

[Magnus Pedersen <bofhenator@gmail.com>]

H.S. wrote:
> Nyizsnyik Ferenc wrote:
> > On Mon, 12 Nov 2007 11:05:53 -0500
> > "H.S." <hs.samix@gmail.com> wrote:
> >
> > > Hi,
> > >
> > > When I rotate an image in Konqueror, is the rotation lossless?
> > >
> > > I have a few gigs of photos which I cannot import as an album into my
> > > digikam (not enough space in /home). So I am trying to see if I can
> > > rotate the images in konqueror -- the images resize on a different
> > > partition at present.
> > >
> > > ->HS
> > I use gthumb, and it claims that 90-degree rotation of jpegs is
> > lossless. Since gthumb, digikam and konqueror all depend on libjpeg62,
> > "a library for handling JPEG files", I assume they all rotate them
> > lossless.
>
> Anyway to confirm it?
Hm, dunno if there is a certified way, but perhaps an md5 before you 
rotate, then rotate, save, rotate back and md5 again? I have no idea if 
some of the metadata in a jpeg will be changed by this.

/Magnus