Re: compression strategy
- Subject: Re: [iris-photos] compression strategy
- From: Cathy <email@example.com>
- Date: Mon, 28 Jun 2004 08:10:31 -0700
In a message dated
6/27/2004 10:23:30 PM Central Daylight Time, firstname.lastname@example.org
JPEG compression formulas don't produce linear results. The scale you
see as you save an image to JPG is a quality index scale. The fewer the
actual shades of color in the image the smaller the file will be after
conversion. a megabyte file compressed at an index of 50 can vary in
size fron 50 to 100kb's depending on the actual number of shades.
small images were compressed to 38-40 and larger images (1500 x 1000)
were compressed to a quality index of 49.
For web use 72 dpi and the color palette of 214? "websafe" colors would
be standard. There are a number of batch resizing programs that will
convert 100's of images to a certain dpi, color palette and compressed
file size. I haven't used any of them so don't have any recommendations.
John mentioned Adobe's SaveForWeb function which is the easiest way I
know to get web ready photo's for websites and Iris-Photos. I believe
it also in Adobe elements II at $29.99.
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