[magick-users] how to avoid quantize()

[Anthony Thyssen]

On Thu, 12 Nov 2009 17:46:05 +0800
ZHOU Xiao-bo <zhxb.ustc at gmail.com> wrote:

| hi all:
| 
|      When I resized( actually shrinked it) a GIF using C++ interface, I got
| an output much larger than the original.
| I noticed that the output image's platte is 256, and I think it's the
| reason.(I am sure I compiled tiff with lzw.）
| 
|      So I must first use 'sample' to resize and then 'quantizeColors' and
| 'quantize' to reduce the colors to get a smaller
| output. But 'quantize' introduces a much longer time.
| 
|      How can I resize a GIF and avoid using 'quantize' to get an output
| image with the original platte?
| thanks a lot.
| 
Use sample so you don't generate colors when resizing.

Of course the quality is really bad, because you are not creating new
colors!




  Anthony Thyssen ( System Programmer )    <A.Thyssen at griffith.edu.au>
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   All these theories, diverse as they are, have two things in common.
   They explain all the observed facts and they are complete and utterly
                  WRONG.        -- Terry Pratchet, "The Light Fantastic"
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     Anthony's Home is his Castle     http://www.cit.gu.edu.au/~anthony/