On Monday, 22. July 2013 08:38:00 Alex Vergara Gil wrote:
Hello GIMP developers: I am working on a project where I need to set all pixels below a level as alpha channel, is there a quick way to achieve this? The level can be both set a priori or adjusted dinamically, the second way is prefered. Right now my workflow includes: 1. duplicate layer. 2. use color level in duplicate layer, in menu COLOR -> LEVEL. 3. add alpha mask to original layer 4. copy duplicate layer into the alpha mask of the original. 5. delete duplicate layer. 6. If result is not ok then return to 1. As you can see this workflow is a headache, specially point 6 which is often achieved. Any thoughts
1. Create a channel mask from the grayscale value. 2. On the channel mask, use the threshold tool. Voilà! -- Mein öffentlicher Schlüssel / My public key: 4096R/600ACB3B 2012-04-01 Fingerabdruck / Fingerprint: 9902 575B B9A0 C339 CFDF 250B 9267 CA6B 600A CB3B Runterladen z.B. bei/ Get it e.g. from: pgp.mit.edu, subkeys.pgp.net, pgp.uni-mainz.de, pool.sks-keyservers.net, ...
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