Farid Elyahyaoui on wrote...
|
| Hi,
|
| I'm relatively new to imagemagick so sorry if this question sounds
| stupid to you. I tried to search for an answer on the internet but
| couldn't get a good answer to this question:
|
| How can I get the colours from an image?
A number of ways
1/ You can use
identify -verbose image.png
This fails for images with more than 1024 colors though.
It will output the images color table and color histogram.
NOTE: an image may not completely use all the colors defined in its
color table.
2/ You can get a histogram...
See IM Examples on "histogram:"
http://www.cit.gu.edu.au/~anthony/graphics/imagick6/files/#histogram
Basically it is the text header of the "histogram:" MIFF format image
Just ignore the binary image data.
convert image.png histogram:- | \
sed -n '/^Comment={/,/^}/{ s///; /^$/q; s/^ *//; p; }' \
> color_table.txt
This also tells you how many pixels use each color in the image.
3/ You can use the (NEW for IM v6.2.8-8) -unique-colors operator.
this replaces each image in the current image sequence with a new
image containg one pixel for each unique color found, in the order
they are found during a by a row by row search through the image.
The result is a 1 pixel high image with the image length being the
number of unique colors. You can output the colors to the screen
using the txt:- (IM text image format)
convert image.png -unique-colors txt:-
You can also save those colors to use with the -map operator
convert image.png -unique-colors image_colormap.png
| I'm trying to create a color palette generator based on an image such as here:
| http://www.degraeve.com/color-palette/
|
Looks like you wanted the new -unique-colors operator and merge the
output image with its 'txt' version (comment part of the file format)
| I know I can reduce the number of colors to six or so, but I don't know how
to extract the colors so I can save them in a text file.
Reduce them using -colors 6 you may need to specify the colorspace
for the reducion, however this is currently under development, though
-quantize is the current way to do this.
See color reducion, colorspaces
http://www.cit.gu.edu.au/~anthony/graphics/imagick6/quantize/#quantize
(as mentioned things are in flux)
Anthony Thyssen ( System Programmer ) <[EMAIL PROTECTED]>
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Don't explain computers to laymen. Simpler to explain sex to a virgin.
--- Robert Heilein, "The Moon is a Harsh Mistress"
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Anthony's Home is his Castle http://www.cit.gu.edu.au/~anthony/
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