[magick-users] Ordering of colors after MagickUniqueImageColors

[Anthony Thyssen]

"Jonathan Halterman" on  wrote...
| I'm using MagickUniqueImageColors to determine the set of colors used
| in an image, but a problem (for me) is that the resulting Image always
| has its unique colors ordered from darkest to lightest.
|
Actualy it is not even that.  I do not think it is even defined what the
ordering is.

For example in IM examples I get the unique colors from a 'tree' GIF image.
   http://imagemagick.org/Usage/quantize/#extract

the color order definatally has one green which is lighter that the two
greens on either side of it.


| For my particular application, MagickUniqueImageColors is great, but I
| also need to know which colors were the most prominent in the original
| image and it would help if the resulting image ordered its colors from
| the most prominent color (existed in the most pixels) to the least
| prominent.
| 
You want a histogram.  As such output the image comment from the
"histogram:" image...

For example...
    convert  tree.gif  -format %c histogram:info:-

See
   http://imagemagick.org/Usage/files/#histogram

If you want to ensure the quality depth of the results
or combine all 16bit colors down to 8bit colors
use a -depth setting.

| Is something like this possible via any other means? Should I submit a
| feature request for this? Would it actually be fulfilled?
| 
It is present.  You just needed to look a bit further in IM Examples.

  Anthony Thyssen ( System Programmer )    <A.Thyssen at griffith.edu.au>
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         Black holes are merely where God divided by zero
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     Anthony's Home is his Castle     http://www.cit.gu.edu.au/~anthony/