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Undo Layer Mask [For Green Screen Affect]

Aug 19, 2011, 11:08
Post: #1
Undo Layer Mask [For Green Screen Affect]
Hi Guys,

I'm using Gimp to acheive a green screen affect (have a picture of a person with a background, changing background). I've used the technique of applying a layer mask and masking over the background [if anyone can tell me a better method, please do, the picture has several different background colours unfortunatly]. The problem is that I have accidently gone over the person in some places and can't undo [i.e. ctrl+z] as have done a lot more masking after that.

Any suggestions on what I could do would be appreciated.

Thanks,

EdenC
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Aug 19, 2011, 11:13 (This post was last modified: Aug 19, 2011 11:14 by EdenC.)
Post: #2
RE: Undo Layer Mask [For Green Screen Affect]
(Aug 19, 2011 11:08)EdenC Wrote:  Hi Guys,

I'm using Gimp to acheive a green screen affect (have a picture of a person with a background, changing background). I've used the technique of applying a layer mask and masking over the background [if anyone can tell me a better method, please do, the picture has several different background colours unfortunatly]. The problem is that I have accidently gone over the person in some places and can't undo [i.e. ctrl+z] as have done a lot more masking after that.

Any suggestions on what I could do would be appreciated.

Thanks,

EdenC

Nevermind: Using the eraser tool works. However, I am still up for suggestions on an easier way of doing this [the green screen affect].

Thanks,

EdenC
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Aug 19, 2011, 11:16 (This post was last modified: Aug 19, 2011 12:10 by EdenC.)
Post: #3
RE: Undo Layer Mask [For Green Screen Affect]
Super sorry for the triple-post but I've just found out that the eraser doesn't really work all the time - help please!

EDIT: Fixed!
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Aug 19, 2011, 12:31
Post: #4
RE: Undo Layer Mask [For Green Screen Affect]
To edit the layer mask again, recreate a layer mask and initialize by transferring the alpha channel. Then use a black (transparent) or white (opaque) brush to edit it.

You can make a backup of the alpha channel: display only that layer, and in the Channels dialog, duplicate the Alpha channel. To restore, add a layer mask, and init to the saved channel then apply mask.

Now answering your questions on
https://Gimp-Forum.net
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