Re: [Gimp-user] Invert alpha channel

2013-07-13 Thread Ville Pätsi
On 2013-07-12 22:43, Mikael Ståldal wrote:
 Is there an easy way in GIMP to invert the alpha channel of an image? 
 Transparent should be opaque, opaque should be transparent, almost 
 transparent should be almost opaque, etc.

Quickest way is to right click on the layer and choose Add Layer Mask.
From there choose Transfer layer's alpha channel. Then select the
newly created mask and do Invert from the Colors menu. You can then
apply the mask if you want.

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Ville Pätsi

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[Gimp-user] Invert alpha channel

2013-07-12 Thread Mikael Ståldal
Is there an easy way in GIMP to invert the alpha channel of an image? 
Transparent should be opaque, opaque should be transparent, almost 
transparent should be almost opaque, etc.

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Re: [Gimp-user] Invert alpha channel

2013-07-12 Thread Pat David
Layer - Transparency - Alpha to Selection.
Save as channel.
Apply as layer mask.
Invert.
Does that help?


On Fri, Jul 12, 2013 at 3:43 PM, Mikael Ståldal mik...@staldal.nu wrote:

 Is there an easy way in GIMP to invert the alpha channel of an image?
 Transparent should be opaque, opaque should be transparent, almost
 transparent should be almost opaque, etc.
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Re: [Gimp-user] Invert alpha channel

2013-07-12 Thread Eduard Braun

Am 12.07.2013 22:43, schrieb Mikael Ståldal:
Is there an easy way in GIMP to invert the alpha channel of an image? 
Transparent should be opaque, opaque should be transparent, almost 
transparent should be almost opaque, etc.

Yes, there is:

1. Choose Colors - Components - Decompose from the menu and set
   Color model to RGBA.
2. A new image is opened with all color channels (including alpha
   channel) decomposed as single layers.
3. Select the layer alpha and choose Colors - Invert from the menu.
4. Choose Colors - Components - Compose from the menu, set Color
   model to RGBA and make sure the layers are correctly mapped to
   the channels (should be given if you did not reorder the layers)

Regards
Eduard

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