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Grayscale and alpha layers

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Grayscale and alpha layers Psiweapon 21 Oct 08:04
  Grayscale and alpha layers yahvuu 21 Oct 09:48
  Grayscale and alpha layers Ofnuts 21 Oct 23:59
  Grayscale and alpha layers Richard Gitschlag 22 Oct 12:05
Psiweapon
2012-10-21 08:04:41 UTC (about 12 years ago)

Grayscale and alpha layers

Is there any way I can directly make a grayscale image into an alpha transparency channel?

I mean, NOT involving selection? Because selection by color to layer mask, is really fucking up what I need to do thanks to the selection threshold.

Why is it damn easy to turn an alpha channel into a grayscale image but not the reverse?

yahvuu
2012-10-21 09:48:24 UTC (about 12 years ago)

Grayscale and alpha layers

Am 21.10.2012 10:04, schrieb Psiweapon:

Is there any way I can directly make a grayscale image into an alpha transparency channel?

did you try Colours->Colour to Alpha?

Or, with a layer mask as intermediate step: 1) Add Layer Mask... Initialise Layer Mask to: [x] Greyscale copy of layer 2) Apply Layer Mask

BR,
peter

Ofnuts
2012-10-21 23:59:47 UTC (about 12 years ago)

Grayscale and alpha layers

On 10/21/2012 10:04 AM, Psiweapon wrote:

Is there any way I can directly make a grayscale image into an alpha transparency channel?

I mean, NOT involving selection? Because selection by color to layer mask, is really fucking up what I need to do thanks to the selection threshold.

Why is it damn easy to turn an alpha channel into a grayscale image but not the reverse?

With the grayscale image visible, open the Channels list and on any of the color channels: right-click+Channel to selection Back on layer, add layer mask and initialize to selection

Richard Gitschlag
2012-10-22 12:05:25 UTC (about 12 years ago)

Grayscale and alpha layers

Date: Sun, 21 Oct 2012 10:04:41 +0200 From: psiweapon@gmail.com
To: gimp-user-list@gnome.org
Subject: [Gimp-user] Grayscale and alpha layers

Is there any way I can directly make a grayscale image into an alpha transparency channel? I
mean, NOT involving selection? Because selection by color to layer mask, is really fucking up what I need to do thanks to the selection threshold.

Why is it damn easy to turn an alpha channel into a grayscale image but not the reverse?

The fastest way is to perform a Color to Alpha transition (under Layers > Transparency) using black as the background color.  Black becomes transparent, white becomes opaque.

-- Stratadrake
strata_ranger@hotmail.com
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