Hi Norman,

On Sun, Apr 27, 2008 at 6:47 PM, norman wrote:

I have a photograph of a black hexagon on a white background and I would like to make the background transparent so that I can lay this onto another image. I have tried and not made much progress and would be grateful if some kind person could please point me in the right direction.

'Color to Alpha' should do what you want. In the layers->transparency menu IIRC.

Norman

norman wrote:

I have a photograph of a black hexagon on a white background and I would like to make the background transparent so that I can lay this onto another image. I have tried and not made much progress and would be grateful if some kind person could please point me in the right direction.

Norman

Convert the image to RGB mode if it's not already. Select the white region by color. In the Layer -> Transparency menu, add an alpha channel. In the same menu, set "Color to alpha". This should make the white background to transparent.

Jon

Convert the image to RGB mode if it's not already.

However, the set Colour to Alpha setting remained greyed out of action. What have I missed, please?

Norman

Are you in RGB mode? You can check it in Image->Mode.

Daniel

Like he said, changed it to RGB if it's not already. in the layers toolbox, right click on the layer and in the menu that comes up click "add alpha channel". Then use the eraser tool on the area you want erased just to see if it works.

On Sun, Apr 27, 2008 at 12:01 PM, norman wrote:

Convert the image to RGB mode if it's not already. Select the white region by color. In the Layer -> Transparency menu, add an alpha channel. In the same menu, set "Color to alpha". This should make the white background to transparent.

I selected the white region by colour and in the Layer-> Transparency menu added an alpha channel. However, the set Colour to Alpha setting remained greyed out of action. What have I missed, please?

Norman