Re: [Gimp-user] how can I change the existing values of color and alpha ?

On 12/04/2013 12:04 PM, Cristian Secară wrote:
I have a plain rectangle with overall c09300c0 RGBA levels.
I want to change the alpha channel value from c0 (193) to some other
value, for the whole image at once. Or some other color channel.

How can I change the absolute value of a channel ? The color menu has
only relative adjustments.

Thank you,

To change the alpha value, add a layer mask (initialize by transferring the layer's alpha channel), and bucket fill with the required value.

To change a color channel (say, red): use the Levels tool, select the red channel, and set it value to 0 everywhere by dragging white handle on the bottom scale fully to the right. Then add a layer, set it to "Addition" mode, and paint on it using colors with only a red component.

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