Re: jpg quality question with imagemagick and Gimp

Fred Weinhaus wrote:
> Just use a lower quality value in IM. Quality can be different in 
> different programs.
>
> Another issue is the compile Q level of IM. If you are running Q16 
> IM, then try adding -depth 8. That will lower the file size in IM, 
> too.
>
> Other factors such as profiles and other header information can 
> contribute also. So as Bob Meetin said, you can also add -strip to 
> remove those.
>
> We don't know what you have done in GIMP or what GIMP does by itself. 
> So it is hard to say exactly what to do.
>
>
>   
>> How can I get the same result with imagemagick (convert, mogrify)
>>     
With GIMP when you go to save you get a slightly different dialogue if 
you are saving .jpg (quality in percent) or png.  If you want to save 
PNG-8 vs PNG-24 you have to go slightly out of your way before you opt 
to save.  IM is slightly easier in both respects.  It is many times 
faster to use IM to run a series of comparative tests of, say, 30%, 40%, 
50% ... 100% quality if you wanted to do that.  Different programs - 
different needs - different purposes.