| >Hello,
| >
| >I have gray images and I want to transform intervals
| >of gray values to transparent with PerlMagick, lets say
| >[rgb: 0 0 0 0 ... rgb: 45 45 45 0]. I have tried it with
| >
| >for ($j = 0; $j <= 45; $j++) {
| > $rgb_gray = 'rgb:' . ' ' . $j . ' ' . $j . ' ' . $j . ' ' . '0';
| > $image->Transparent(colors=>"$rgb_gray");
| >};
| >
| >but it seems that only 0 0 0 0 will be transformed to
| >transparent (even if I choose an interval where
| >black is not included). How can this task be done?
| >Thank you!
|
Fred Weinhaus on wrote...
| I am not sure I understand what you are trying to do. But process
| your grayscale image without transparency to the form you want, then
| add that processed image to your original as the alpha channel.
|
| See copyopacity
|
| http://www.imagemagick.org/Usage/compose/#copyopacity
|
It may also be that you need to use rgba: rather than rgb:
Sorry for the delay, I have been on vacation in china for 5 weeks.
However if the image is already a greyscale image (not just data)
then it is probably faster to do it within IM as Fred described.
If you just have a pure text data file, then there are methods to
convert it to a greyscale image using say a PbmPlus type of image file
format. That format has a minimal text header followed by either binary
or text numbers. The image can be bitmap, greyscale or RGB, though not
RGBA. You say its grey scle, so a PGM image format may be best, then
you can use Im to convert that into transparency masks.
Anthony Thyssen ( System Programmer ) <[EMAIL PROTECTED]>
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Anthony's Home is his Castle http://www.cit.gu.edu.au/~anthony/
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