Hugemann on wrote...
| > If you want the alpha channel to contain the luMinosity yes.
| > make sure of your spelling ;-)
| >
| > You should also be able convert a 'clone' of the image to HSL format
| > (-colorspace HSL) and extract the "Luminosity" channel of the image.
|
| I tried to generate an alpha channel for my PNG but was only partially
| sucessful. Finally, I came back to my original plan - I wanted to
| overlay a black and white logo on JPEGs - and succeeded with
|
| convert -density 171 logo.eps logo.png
| composite logo.png photo.jpg -compose bumpmap -gravity southeast result.jpg
|
| Proceeding such, the white parts of the logo become totally transparent
| while the darker parts overlay the photograph. I took this trick from
| Anthony's webpage:
| http://www.cit.gu.edu.au/~anthony/graphics/imagick6/annotating/#overlay
|
| I also found his -density trick for vector graphics on his webpage:
| http://www.cit.gu.edu.au/~anthony/graphics/imagick6/formats/#vector
|
You can merge these command using...
convert -density 171 logo.eps photo.jpg +swap \
-compose bumpmap -gravity southeast -composite result.jpg
Anthony Thyssen ( System Programmer ) <[EMAIL PROTECTED]>
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Vorlons ask, "Who are you?"
Shadows ask, "What do you want?"
So I ask you -- Who are you? -- What do you want? -- Babylon 5
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Anthony's Home is his Castle http://www.cit.gu.edu.au/~anthony/
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