Re: best compression strategy

Harold,

First of all, anything greater than 72 dpi just makes the picture 
bigger on the screen. Virtually all computer monitors are 72 dpi.

Then decide what size in inches by inches you want the image to appear 
on the screen.

So that gives you your basic file size. The only other way to make the 
files size smaller is the compression ration you choose when you save 
the file as a JPEG. Of course the greater the compression, the lower 
the quality of the picture. But more often than not, you can't really 
tell the difference. You don't want to try and use the same file for 
any print work.

Photoshop has a great facility called "Save For Web". It automatically 
converts files to 72 dpi and allows you to try several different 
compression ratios and will display the compressed file size for you.

Most other programs don't give you the file size until you save it and 
check for yourself.

John


On Jun 27, 2004, at 10:16 AM, Harold Peters wrote:

> Hopefully there are some computer  image experts lurking on this 
> group. I am scanning 5" x 7" photos at 150 dpi for a web site. File 
> sizes are 75 to 100 kb range. I need the file size to be 25 to 35 kb 
> without cropping. Is there a best strategy for getting this reduction 
> while maintaining a good to excellent image quality and the best 
> image size for the viewers?  
>  
> Harold Peters
> Beautiful View Iris Garden
> 2048 Hickok Road
> El Dorado Hills, CA 95762
> harold@directcon.net  www.beautiful-view-iris.com
>  
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John                | "There be dragons here"
                          |  Annotation used by ancient cartographers
                          |  to indicate the edge of the known world.

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