Florent Monnier on wrote...
| > | Is it normal to get this result with:
| > | http://www.linux-nantes.org/~fmonnier/OCaml/ImageMagick/magick-logo.png
| > | BlurImageChannel(img, RedChannel, radius,sigma,exception);
| >
| > You are bluring only one channel...
| >
| > convert logo: -channel red -blur 0x20 result.png
| >
| > That is what I got. The red channel is black in the blue cloak of the
| > wizard, while it is 'white' or 'full on' elsewhere.
| >
| > The result the red seeps into the cloak, making it more purple,
| > and the black seeps out making the red surounding the close darker
| > resulting in a cyan (blue and green) shading.
| >
| > The stars and the title almost all 'full-on' in the red in thouse areas,
| > so the only chnage is the black borders of the stars becomming very red.
| >
| > As such YES this is the correct result!!!!
|
| I really don't understand, since I clearly see that the red channel is not
| blured with the text "ImageMagick" which is written in Red.
|
| And the clothes of the wizard which are Blue are blured!
|
Bluring individual color channels treats each channel as a grey scale
image. Blur has no sense of color, and an individual channel is only one
part of a color.
The color white is NOT really a color, but the composite of red, blue
and green combined to produce white. Just as black is really the absence
of these three colors.
As such red text on white is in the red channel, all on. No differences
and nothing to blur.
If you had blurred all the channels for red text on white, the blue and
green channels will spread, making the red text whiter (adding blue and
green) and the white areas redder (removing blue and green colors).
Blue on white however is if you look at the red channel, full-off red in
a field of full-on red. so a blur makes the blue areas red, as red is
spread into the blue region, and the white parts less red (cyan), as
thins the red channel out.
For a red area on black, then you will get the look you were trying to
get!!!
Anthony Thyssen ( System Programmer ) <[EMAIL PROTECTED]>
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The UNIX Project was the last best hope of defeating Microsoft. It Failed.
But in the Year of the Platform Wars, it became something greater...
Users last best hope for a open Operating System
The year is 1998. The place: Linux 5 -- Anthony Thyssen
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Anthony's Home is his Castle http://www.cit.gu.edu.au/~anthony/
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