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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