Images grow in size on disk when shrinking dimensions

Excellent, thanks for the help Anthony!  The -map parameter
did exactly 
what I needed, reducing the image size of the scaled version
while 
maintaining an acceptable quality level. 

In this case file size was important because I am processing
and storing 
large numbers of images, but I understand how usually the
color table 
expansion is desirable when scaling. 

Thanks again,
Ben

Anthony Thyssen wrote:

>Ben Weintraub on  wrote...
>| Sorry for replying to myself,
>|
>| I've figured out using the 'identify' command that the
scaled version
>| of the image has 256 colors, while the original only
has around 30.
>| Setting the -colors parameter manually to equal the
number of colors
>| in the original fullsize image results in a
significantly smaller
>| scaled image.
>|
>| Is there some way to tell convert to automatically
keep the same
>| number of colors in the resizing process?
>|
>You do NOT want that.  Resizing images by default and
desirably, merges
>or blurs colors appropriateally to make the resized
image look sharp and
>good.  Reducing the number of colors is ONLY used to
reduce disk space.
>
>If that is what you want, use -colors, but it will not
and should not be
>the default.
>
>Also by using -colors  you many not get the smae color
set as the
>original image!!!  If that is what is wanted you you
should use -map
>with the original images file name (or a saved copy in a
'mpr:'
>register) to define the 'reduced color table' for the
final image.
>
>This is one area that I have not expanded on in the IM
examples.
>
>  Anthony Thyssen ( System Programmer )   
<A.Thyssengriffith.edu.au>
>
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