Already downloaded the help package at gimp.org. havent read it thoroughly tho, but so far I havent find any clue on doing those in GIMP. GIMP’s help are more to user manual rather than like other softwares’ (blender’s documentation project for example).
See in photoshop I use alpha channel alot, one of those technique i use is to copy a layer, tone the brightness/contrast to full black/white, then I just copy it to alpha channel. But I can’t find a way to do this in GIMP. Any idea?
How about the gimp forum? searched google, but no luck.
The gimp it’s a Photoshop clone, almost all the basic operations can be
made with…but sometimes with a quite different aproach
I don’t know why you use this technique
But you can save in a alpha chanel of course
But you must have a selection before
So copy your layer, make it balck and white than select ( the black and white?) and
in the menu Selection -> Save in a Channel ( not sure of name my Gimp is french )
Well, the reason I use copied layers as alpha channel I can gain the layer’s antialiasing level and also the black/white gradient levels. Thus when used in 3D softwares the transparency can be soft, just like the image in the layer. Using selection I need to re-adjust the feather, aliasing and stuffs, and often don’t appear quite soft as the original layers.
Thanks for reply and the super cool link!
Not english forum, but lots speaks english there anyway. I also found alot forum but none in english. Is GIMP so unpopuler in US or british or anywhere near that?
I haven’t access to Gimp here at school, but if I remember right:
Select the grayscale image and copy to clipboard. Click on the image to modify (so that it is active). Open the layer’s dialogue. Right click and create an alpha mask layer (make sure you’re modifying the image to add the alpha mask to). Paste from clipboard. Right click on the new (alpha) layer and select the option to apply (I don’t remember how it’s worded, sorry) – when you’re done you should not have a separate alpha layer.
I like the pre-Gimp 2.0, so if you’ve got 2.x things might be moved/named slightly differently, but they should still all be there.
I’m using 2.28 now. I think I’ve tried that before, copied the layer (to the clipboard) but when I clicked new channels then use paste, it pasted into layers, instead of the new channel. Not sure about right clicking stuff. I’ll go and check it out again. Thanks.