[magick-users] smooter gradients

[Anthony Thyssen]

Bob Meetin on  wrote...
| I'm using the following to create a gradient:
| 
| convert -size 10x600 gradient:#000-#fff gradient.gif
| 
| It creates the image fine, but the transition is not smooth  See sample at:
| 
| http://dottedi.biz/codesamples/themes2/graphics/img.gif
| 
| I used 100x600 in this sample to make it easier to visualize the 
| problem.  What option do I use to make this a smoother transition gradient?
| 
This was a color quantization problem that was fixed in later IM's

Download and install the latest release.

In the latest IM
   convert -size 1x256 gradient: gradient.gif

will produce an image with 256 pixel, each a different color.
Using the 256 color limit of GIF file format.

EG this should produce the number 256 (color count)
  convert -size 1x256 gradient: gif:- | identify -format %k -


  Anthony Thyssen ( System Programmer )    <A.Thyssen at griffith.edu.au>
 -----------------------------------------------------------------------------
   The gods confound the man who first found out how to distinguish hours!
   Confound him, too, who in this place set up a sun-dial, to cut and hack
   my days so wretchedly into small portions.             -- Titus Plautus
 -----------------------------------------------------------------------------
     Anthony's Home is his Castle     http://www.cit.gu.edu.au/~anthony/