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Reduce file size of images exported through iPhoto
Authored by: rushmoom on Aug 07, '03 11:42:29AM

When I first read this hint I wanted to kick myself for not knowing this sooner. It wasn't more than a few minutes before I had apt-get'd my way to image optimization bliss. The files sizes of the photos in my online photoalbums was nearly halved!

Then, as I looked through them I thought to myself "I don't remember my photos looking this crappy." An a/b comparison proved my fear - imagemagick was doing more than removing profile info.

My assumption is that it's also affecting the "quality" of the image, perhaps setting it to the default, 75%. I tried setting the quality to 100%, but that only increased the file sizes (most of my images are around 90%).

I have no idea why the quality would be affected without specifying the quality arg. A look at the man page and some cursory tests didn't reveal anything to me.

I'd love to see if anybody has any additional insight?



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Reduce file size of images exported through iPhoto
Authored by: jim3e8 on Oct 13, '03 07:33:21PM

This is an old thread, but I hope this comment will be seen.

convert and mogrify will recompress your image, no matter what options you give it; AFAIK you can't get around it. So, the majority of the 20-100K savings people are getting probably come from reducing the iPhoto exported image from quality 95+, to the imagemagick default of 75. Quality 100 does reduce picture quality, by the way. I think this is a misfeature [you can't even add a comment without losing image quality].

You can check the actual size of the profile data with 'identify -verbose filename.JPG'.



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