On Sun, Aug 2, 2009 at 12:23 AM, Jay Smith <[email protected]> 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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