On Tue, 27 Jul 2004, George N. White III wrote:

> For images that will be displayed only at low resolution it may be useful 
> to downsample the original image to reduce the size.  For example you 
> might have a 2 inch by 2 inch image scanned at 400 dpi.  This image would 
> have 800x800 pixels.  For screen display you might prefer to have a 
> 200x200 pixel image (or 100 dpi for 2 inches).  Downsampling refers 
> to the process of reducing an 800x800 pixel image to 200x200 pixels.
> ways to reduce image size (lossy compression, colorspace changes,
> even converting certain images to line art).

Quite soon, I'm going to convert the degrade LaTeX-package
(CTAN: graphics/degrade) to ConTeXt. It permits to down-sample JPEG images on
the fly to a given resolution.
Cheers, Peter

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