Re: compression strategy
- Subject: Re: [iris-photos] compression strategy
- From: C* <k*@earthlink.net>
- Date: Mon, 28 Jun 2004 08:10:31 -0700
o*@aol.com wrote:
In a message dated 6/27/2004 10:23:30 PM Central Daylight Time, k*@earthlink.net writes: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.
FWIW: small images were compressed to 38-40 and larger images (1500 x 1000) were compressed to a quality index of 49.
Quality index?
Elaborate please.
Smiles,
BB
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.
Michael M.
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