On Friday 16 May 2008, Lap1994 wrote:

Hello. I want to draw a image with a 50% opacity border. When I change the opacity of the pencil and use it, the selected color and the color where I use the pencil, combine itself. I do not want it, I want draw a pixel with exact 50% of alpha and the color selected. Like a bitmap with a alpha channel.

Do not want: black pixel + %50 opacity, white color = silver Want: black pixel + %50 opacity, white color = 50% opacity white pixel

Hello!

How about a lyer mask made of white (for the opaque parts) and 50% grey (for the 50% transparent parts)?

Daniel

Quoting Lap1994 :

Hello. I want to draw a image with a 50% opacity border. When I change the opacity of the pencil and use it, the selected color and the color where I use the pencil, combine itself. I do not want it, I want draw a pixel with exact 50% of alpha and the color selected. Like a bitmap with a alpha channel.

I can't think of a direct way to do that but it can be accomplished with a few extra steps.

* Duplicate your original layer (this will let you see the image as you paint).
* Add a black layermask to the duplicate layer. * Apply the layermask. (The layer will become transparent, but the original color data is still there.) * Choose your paint tool and set the Opacity slider (in the Tool Options) to the level of _transparency_ which you desire. If you want the border to end up with 20% opacity then set the slider to 80% (fifty percent opacity means fifty percent transparency). * Paint the duplicate layer. (You can toggle the visibility of the original layer to see how the semi-transparent result of your painting will appear; however, the unpainted regions will not be visible.) * Add a layermask to the duplicate initialized to "Transfer the layer's alpha channel" with the "Invert" box checked. * Hide or delete your original layer.

saulgoode@flashingtwelve.brickfilms.com said on May 17, 2008 7:31 -0400 (in part):
I'm not sure why you need the layer masks? Won't the following work a little more simply or does method you suggest do something I've missed ... 1. Create new transparent layer, select it, leaving background visible. 2. Make rectangular selection to leave the border width desired (say 50 pixels) and invert ctrl+I
3. (optional) Select-feather choosing width half border width (say 25 pixels)
4. Select foreground color desired and drag to image. (will leave a solid (optionally feathered) border) 5. Drag opacity slider to 50% or to taste. 6. If "happy" merge visible.

Quoting Lap1994 :

Hello. I want to draw a image with a 50% opacity border. When I change the opacity of the pencil and use it, the selected color and the color where I use the pencil, combine itself. I do not want it, I want draw a pixel with exact 50% of alpha and the color selected. Like a bitmap with a alpha channel.

I can't think of a direct way to do that but it can be accomplished with a few extra steps.

* Duplicate your original layer (this will let you see the image as you paint).
* Add a black layermask to the duplicate layer. * Apply the layermask. (The layer will become transparent, but the original color data is still there.) * Choose your paint tool and set the Opacity slider (in the Tool Options) to the level of _transparency_ which you desire. If you want the border to end up with 20% opacity then set the slider to 80% (fifty percent opacity means fifty percent transparency). * Paint the duplicate layer. (You can toggle the visibility of the original layer to see how the semi-transparent result of your painting will appear; however, the unpainted regions will not be visible.) * Add a layermask to the duplicate initialized to "Transfer the layer's alpha channel" with the "Invert" box checked. * Hide or delete your original layer.

Regards ... Alec -- buralex-gmail

On Sunday 18 May 2008, Lap1994 wrote:

Let make things more simple to understand.

If I draw a %50 opacity white pixel above one black pixel with the pencil it becomes silver. But I want the pixel WHITE AND WITH %50 OF OPACITY. I simply want to change the alpha when I draw and not how much the color change.

Let's try a step by step solution so that your chances of mistake are diminshed:

1) open layers dialog (ctrl + l) 2) right click on layer, select "Add layer mask" 3) on the dialog that apears, choose "White (full opacity) 4) Pick the pencil, black color, choose 50% opacity an start painting - you will be cretaing gray colr on the mask, which means your image, at the corresponding pixels, will be translucent. That will be depicted by a gaye checkered pattern you will be able to notice in the places you are painting 5) Before saving, click on the layer thumbnail on tehlayers dialog, so that it becomes the active drawable. Otherwhise, you will be saving only the mask itself
6) Be sure to save he file ina file format which accepts translucency - such as .png (don't try .jpg or .gif)

Happy gimping!

js ->

Von: Lap1994

Hmm... There is no button to do this? Only ways using features that are not made exactly for it? Developers read this mail list? Can I suggest this? A simple toogle box that change mix opacity to exact opacity.

What exactly do you use this for?

Michael

El dg 18 de 05 de 2008 a les 23:03 -0300, en/na Lap1994 va escriure:

Let make things more simple to understand.

If I draw a %50 opacity white pixel above one black pixel with the pencil it becomes silver. But I want the pixel WHITE AND WITH %50 OF OPACITY. I simply want to change the alpha when I draw and not how much the color change.

Starting from one layer:

Add a new transparent layer.

Set the transparency to 50% in the tool options, not in the layer options.

Draw on this layer the things you want, when finished, select by color transparent on this layer (threesold 0), invert the selection.

Go to the original layer, cut, then flat the layers.

Hope this helps Pere