Layer Mask
A layer mask defines how much, and which parts, of a layer will be visible. It is actually a black-and-white image, like a channel or the QuickMask. It represents the “alpha channel” of the layer. The whiter the mask is, the more the affected layer shows through—the less transparent it is. Wherever the channel mask is dark, the image will appear transparent.
Let us see how a layer mask works in GIMP.
1. Open a new image file.
2. Duplicate the layer by right clicking on the layer.
3. Now add layer mask by right clicking on the duplicate layer and turn off the original layer.
4. Select ‘ White (full opacity) ’ option from the ‘ Add layer mask ‘ window
The red highlighted area in the above image, shows the layer mask (white square in layer)
5. Select a brush of your choice.
6. Switch the foreground colour to black.
7. Paint the area you want to remove, using the brush tool.
If an area gets removed by mistake, you can re paint it by selecting white as the foreground colour.
8. Once the desired area is removed, you can convert it into a selection by right clicking on the layer and selecting ‘Mask to selection‘ from the drop down menu.
Now you can use this alpha image as and when required.
A layer mask defines how much, and which parts, of a layer will be visible. It is actually a black-and-white image, like a channel or the QuickMask. It represents the “alpha channel” of the layer. The whiter the mask is, the more the affected layer shows through—the less transparent it is. Wherever the channel mask is dark, the image will appear transparent.
Let us see how a layer mask works in GIMP.
1. Open a new image file.
2. Duplicate the layer by right clicking on the layer.
3. Now add layer mask by right clicking on the duplicate layer and turn off the original layer.
4. Select ‘ White (full opacity) ’ option from the ‘ Add layer mask ‘ window
The red highlighted area in the above image, shows the layer mask (white square in layer)
5. Select a brush of your choice.
6. Switch the foreground colour to black.
7. Paint the area you want to remove, using the brush tool.
If an area gets removed by mistake, you can re paint it by selecting white as the foreground colour.
8. Once the desired area is removed, you can convert it into a selection by right clicking on the layer and selecting ‘Mask to selection‘ from the drop down menu.
Now you can use this alpha image as and when required.
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