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In the colour selection I have been searching for a transparent option, but I can't find one. How can I do it?

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In the 'what ever tool it is you're using settings', try to find the Opacity slider. That should be found from the Layers window as well. Of course the layer opacity controls the opacity of a layer where as opacity of a tool, controls the opacity that the tool will produce. –  Joonas Aug 12 '12 at 9:24
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3 Answers

What you'll want to do is create a layer and adjust that layer's opacity.

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Transparency is not a color. Its a property of the image.

There are many ways by which you can induce transparency in your image.

If you want for eg all the red regions in your image to be transparent, go to Layer -> Transparency -> ColorToAlpha and select red color in the 'From' box and click OK. You will obviously need to know the exact HTML-notation of the shade that you want to turn transparent.

If you want the whole layer to be transparent, then play around with the opacity slider as Brian puts it.

Let me know if you need any other help.

NOTE : Only png and gif support transparency. If you save your transparent image as a jpg, all transparent regions would be defaulted to white as jpg doesnt support it.

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Here is my way of converting the selection to transparent.

Just press Ctrl + x, so that the selection is cut.

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