Re: Jpeg optimization
From: Severian (severian_at_chlamydia-is-not-a-flower.com)
Date: 03/04/04
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Date: Thu, 04 Mar 2004 16:34:50 -0500
On Thu, 4 Mar 2004 11:06:06 -0800, "Will"
<anonymous@discussions.microsoft.com> wrote:
>hi all, I've written a module for uploading and resizing images and'
>I ran into problems with image quality. So I found some info on quantizing
>the image before I save it and I integrated this into my module, using
>octree quantization. Now when I upload/resize a gif it looks perfect,
>but when the image is a jpeg I lose more image quality than I was
>previously and I still have the dithering problems. What can I do to
>optimize the jpegs? Any help or links to articles would be great, thanks!
Images compressed by JPEG should be 24-bit continuous tone (photos).
Quantizing before compression will produce horrible-looking -- and
probably larger -- JPEG files.
To improve the quality of Jpeg files, use a higher Q factor and 1:1
sub-sampling.
-- Sev
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