Re: JPG Question

by "Travis Wall" <wallt(at)cadvision.com>

Date:	Mon, 16 Mar 1998 13:20:27 -0700
To:	<mgruenhagen(at)picinc.com>
Cc:	"HWG Graphics" <hwg-graphics(at)hwg.org>
	todo: View Thread, Original

"I have found that when I convert a gif to 16 million and do
a color count it has not changed the number of unique colors
in the image.  And has not changed the file size, it but it
does allow you to have anti-aliasing capabilities and other
image editing options that are not allowed for 256 color
pallet."

    That's because its an 8 bit file to begin with -
typically if you plan on using a JPEG output you do the work
in 24bpp color save it as a lossless raster file, reduce the
color depth (8-15bpp) and then JPEG compress it. At least
this is what I do - as for your GIF thats been updated to
24bpp it will only have its 256 color count as long as you
don't do anything with it, if you do a smooth filter (for
example) it increases the number of unique colors. And I
assure you a JPEG with 256 colors is much smaller than your
average 70 000 color 24bpp image.

-----
Travis Wall, Graphic Designer
Defiance Visual Industries

travis(at)dvi-online.com
"Design is tribute art pays to industry"
-----               (Paul Finch)

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