On Mon, 14 Jun 2010 21:17:11 -0700
[email protected] wrote:
| >Hello,
| >
| >Apologies if I'm missing something obvious, I'm trying to work out
| >how to convert an image to a single colour - much like grayscale but
| >colorised. Effectively what I'm trying to do is replicate the effect
| >of Photoshop's Screen blending mode when the top layer is a solid
| >color. I've put up an example to compensate for my inability to
| >articulate this properly here: http://sho.ch/otterconvert.jpg
| >
| >I can do a duotone easily enough but this has me stumped. It would
| >also make my life notably easier if it was a single invocation of
| >convert.
| >
| >Any guidance would be greatly appreciated.
|
|
| see -tint and related techniques at
| http://www.imagemagick.org/Usage/color/#tinting
|
| also if you are on unix, see my script tintilize at
| http://www.fmwconcepts.com/imagemagick/index.php
|
|
| Fred
|
|
| P.S. On second thought after re-reviewing your example, a better
| method would appear to be
|
| +level-colors blue,white
|
| see http://www.imagemagick.org/Usage/color/#level-colors
Note you should greyscale the image first then apply +level-colors
Remember +level-colors is still a -level operator, just getting its
values (+level -> map black and white to given levels) from the colors
you have specified. each channel will still be modified individually.
So use...
-colorspace Gray +level-colors blue,white
You can also use -gamma afetr the -colorspace operator to adjust the
mid-tone brightness, if you want to.
Anthony Thyssen ( System Programmer ) <[email protected]>
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Base 8 is just like base 10 really...
...if you're missing two fingers. - Tom Lehrer
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