On Sun, Aug 2, 2009 at 12:23 AM, Jay Smith <j...@jaysmith.com> wrote:

> On 08/01/2009 08:37 AM, Martin Nordholts wrote:
> > On 08/01/2009 01:05 PM, photocomix wrote:
> >>   i never noticed a similar bug, even if i used Gimp to save as copy
>  thousands
> >> of jpeg, and i would never believed this possible, but i have to face
> >> evidence
> >>
> >> to the point image dimensions: 90x116 Size: 547KB
> >>
> >> And what is really weird is that seems impossible , re-saving from gimp
>  as
> >> jpg reduce the file size...even at quality 1 ( !!) i can't shrink it
> >
> > The JPEG has an embedded ICC color profile which GIMP ignores since it's
> > a CMYK profile, but it keeps it around anyway and writes it to the JPEG
> > if you resave it.
> >
> > To see the size of the attached color profile, first extract it:
> >
> >    $ exiftool -icc_profile -b -w icc lightbulb.jpg
> >
> > Then look at how big it (and the image) is:
> >
> >    $ du -hb lightbulb.*
> >
> > which gives the output
> >
> >    557168  lightbulb.icc
> >    560484  lightbulb.jpg
> >
> > / Martin
>
> Martin,
>
> Very "enlightening".
>
> In normal use of the program, how would the user known that there was
> such an embedded ICC color profile and thus to use the technique you
> outlined?


Alt+Enter (Image Properties) shows whether there is an ICC profile attached
(and what it describes itself as).
Perhaps it should also mention the size of the profile

David
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