Legacy ImageMagick Discussions Archive

Is it possible using command line scripts to do a color select of all the colors found in a gradient?

This relates to my posts about trying to black-fill the shadow area around the edge of scanned postage stamps that were scanned on a colored background. (Scanning on black background is not ...

Frank, Thanks. That's what I was afraid of.

- The scanning is done using Vuescan and is in whatever its internal format is prior to be saved as tiff. At no point is the image file intentionally (by me) any format other than tiff. Any irregularity may come from the texture of the green paper (though ...

Version: ImageMagick 6.6.2-6 2011-04-02 Q16 (as far as I can go on this OS)
Platform: Ubuntu Linux
API: shell command line

Thanks for the help with getting the black background right and the stamps not piling on top of each other....
http://www.imagemagick.org/discourse-server/viewtopic.php?f=1&t ...

Thanks Fred,

Per your suggestion I replaced (in the previously posted bg_removal.s script)

-background $background -alpha shape \

(The script was from the IM website; I had not modified it prior to this. Earlier in the script the background variable was being set to black. I have no idea what ...

I did not know about IM's dipslay. Thanks!

The answer is yes & no...

$ display result.tif

Shows the stamps positioned where they are supposed to be, but the background is checkerboard (which I am assuming is transparent). The background is supposed to be black and as mentioned above one viewer ...

I have now updated to what seems to be the most recent version that can be installed on our Ubuntu Linux 10.0.4 Lucid (which is old; I don't have a newer OS available).

I am now running: Version: ImageMagick 6.6.2-6 2011-04-02 Q16

There was no "immediate apparent" change in the result.... but the ...

Version: ImageMagick 6.5.7-8 2012-08-17 Q16
Platform: Ubuntu Linux
API: shell command line

I make very large quantities of images of postage stamps for illustration purposes. The final result images of the postage stamps need to be a black background, like this:
http://jsa.viewimage.net/jsa/web ...