[magick-users] -transparent on a range

[Christoph P. Kukulies]

When making a gif transparent, e.g. 

mogrify -transparent white image.gif

it would be sometimes desirable to specify a range for the rgb-value
to be take for transparency. E.g. you have a jpg which has some interpolation
in the white areas so that #fefeff and #ffffff are there but should be counted 
being white. Is there such as an option?

--
Chris Christoph P. U. Kukulies kuku_at_kukulies.org