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alpha from image

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alpha from image erniew@comcast.net 24 Nov 17:07
  alpha from image Michael J. Hammel 24 Nov 18:13
   alpha from image erniew@comcast.net 24 Nov 18:36
erniew@comcast.net
2008-11-24 17:07:47 UTC (over 15 years ago)

alpha from image

I have an RGB image and a grayscale image of the same size. I'd like to use the grayscale image as the alpha channel of the RGB image. How can I do that?

- Ernie http://home.comcast.net/~erniew

Michael J. Hammel
2008-11-24 18:13:34 UTC (over 15 years ago)

alpha from image

On Mon, 2008-11-24 at 16:07 +0000, erniew@comcast.net wrote:

I have an RGB image and a grayscale image of the same size. I'd like to use the grayscale image as the alpha channel of the RGB image. How can I do that?

Open RGB image.
Add an alpha channel (Layers->Transparency->Add Alpha Channel) Add a layer mask (Layers->Mask->Add Layer Mask) Open grayscale image - copy into layer mask you just created (Edit->Copy in grayscale image, Edit Paste with Layer Mask active in the RGB image) Optionally, apply the layer mask (Layer->Mask->Apply Layer Mask).

erniew@comcast.net
2008-11-24 18:36:45 UTC (over 15 years ago)

alpha from image

Michael J. Hammel wrote:

Open RGB image.
Add an alpha channel (Layers->Transparency->Add Alpha Channel) Add a layer mask (Layers->Mask->Add Layer Mask) Open grayscale image - copy into layer mask you just created (Edit->Copy in grayscale image, Edit Paste with Layer Mask active in the RGB image) Optionally, apply the layer mask (Layer->Mask->Apply Layer Mask).

Thanks Michael, worked like a charm.

- Ernie http://home.comcast.net/~erniew