drawing in the alpha channel?
On Tue, Apr 05, 2005 at 09:00:45AM +0200, lode.leroy@advalvas.be wrote:
Hi folks,
I wonder how I can put things in the alpha channel...
I want to take an image (eg. screenshot) and paint
partial transparency into the resulting image.
if you are using a screenshot, first Layers -->Transparency -->Add Alpha
Channel.
after that, i suggest working with the eraser directly on the image to
see if that can do what you would like. you can adjust the transparency
in the tool options.
I found out that I can do "Layer -> Add Mask", then
paint (eg using gradients, with "multiply" ) and then
do "Layer -> Apply Mask" which gives me the desired
/visual/ result, but I would like to apply the mask
to the /alpha/ channel and not to the /r/g/b/ channels.
How would I do this?
where the layer mask is white, there is no transparency. where it is
black it is transparent. gray produces semi transparency. try by
adding a white layer mask, select an area on it and fill that with
black. paint a black to white gradient on the mask and it will be
transparent to opague according to how you painted the gradient.
carol
