Hugemann on wrote...
| For test purposes you may establish any other color weighting by use of
| the -fx operator, for instance:
|
| convert -fx '0.3*r+0.4*g+0.3*b' rgb.gif gray.jpg
|
First. Read the image before you process it ;-)
get into the habit of doing this and you will not get into the
trouble that existed with IM v5.
For speed and larger images I suggest you linit that to just one
channel, and then separate that channel as a greyscale image. :-)
convert rgb.gif -channel R -fx '0.3*r+0.4*g+0.3*b' -separate grey.gif
With a very large image the above will be at least twice as fast.
Anthony Thyssen ( System Programmer ) <[EMAIL PROTECTED]>
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Anthony's Home is his Castle http://www.cit.gu.edu.au/~anthony/
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