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Invert alpha channel

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Invert alpha channel Mikael Ståldal 12 Jul 20:43
  Invert alpha channel Pat David 12 Jul 21:29
  Invert alpha channel Eduard Braun 12 Jul 22:15
  Invert alpha channel Ville Pätsi 13 Jul 06:41
   Invert alpha channel scl 15 Jul 15:19
Mikael Ståldal
2013-07-12 20:43:46 UTC (over 11 years ago)

Invert alpha channel

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.

Pat David
2013-07-12 21:29:59 UTC (over 11 years ago)

Invert alpha channel

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 Stldal 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. ______________________________**_________________ gimp-user-list mailing list
List address: gimp-user-list@gnome.org List membership: https://mail.gnome.org/**mailman/listinfo/gimp-user-** list 

pat david
http://blog.patdavid.net
Eduard Braun
2013-07-12 22:15:28 UTC (over 11 years ago)

Invert alpha channel

Am 12.07.2013 22:43, schrieb Mikael Stldal:

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

Ville Pätsi
2013-07-13 06:41:09 UTC (over 11 years ago)

Invert alpha channel

On 2013-07-12 22:43, Mikael Stldal 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.

-- Ville Ptsi

scl
2013-07-15 15:19:30 UTC (over 11 years ago)

Invert alpha channel

On 13.07.13 at 08:41 AM Ville Ptsi wrote:

Quickest way is to right click on the layer and choose "Add Layer Mask". From there choose "Transfer layer's alpha channel".

Then tick the 'Invert mask' checkbox in the 'Add Layer Mask' dialog and save the Colors/Invert step ;-)

You can then apply the mask if you want.

Kind regards

Sven