Reducing image file sizes

[Brian Yennie]

If you're up for the programming headaches involved, one way to deal  
with very large images is to cut them up into tiles. For example,  
cutting each image into 4 tiles can saving them in JPEG format can be  
considerably smaller than the original image. I believe the  
effectiveness would depend on your content, and of course will only  
work in a compressed format like JPEG where each tile has a chance to  
be optimized by the compression algorithm separately. You could  
potentially load the tiles into a group of image objects and then  
manipulate the whole group at once.

If this is going on a CD, can you not literally use Graphic Converter?  
I believe it is scriptable. If you cut the resolution in half (which  
will double the dimensions), THEN scale to 50% you should end up with  
the original image size with half the resolution.

One last thought, you could attempt to use imageData -- skip every  
other pixel to get "half" resolution and see how the quality turns out.

Hope that helps...

> mark at marksmith.on-rev.com wrote:
>> Will increasing the jpeg compression do it? ie. set the jpegQuality  
>> to 1 -> export img....as jpeg
>
> Maybe... I'll have to see if using such a low quality would destroy  
> the image entirely. The docs indicate anything under 50 isn't going  
> to look too great, but I'll experiment. Thanks for the idea.
>
> -- 
> Jacqueline Landman Gay         |     jacque at hyperactivesw.com
> HyperActive Software           |     http://www.hyperactivesw.com
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