GIMP tools - BDA

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Name of the command
Layer to Image Size
Scale Layer
Add Layer Mask
Apply Layer Mask
Delete Layer Mask
Show Layer Mask
Edit Layer Mask
Disable Layer Mask
Mask to Selection
Add Alpha Channel
Remove Alpha Channel
Alpha to Selection
Merge Visible Layers
Flatten Image
Explanation
To make the layer of the same size as the image.
To resize a layer.
To add a mask to a layer.
To apply a mask to a layer.
To delete a layer mask.
To show a layer mask.
To edit a layer mask.
To disable a layer mask.
To convert a mask into a selection.
To add an Alpha channel.
To remove an Alpha channel.
To convert an Alpha channel into a selection.
To merge all visible layers into one layer.
To merge all visible layers into one layer and remove
transparency.
Masks
Sometimes you need to create a very complex selection, where the selection tools you
have cannot help you. Gimp has a special tool – a Quick Mask – to paint a selection.
When you select an object or an area in the image, the selection is framed by marching
ants, which is not a simple frame. It is a grayscale representation of a channel covering
the whole image. The value of each pixel (point) in the channel is between 0 and 255. If
a pixel is not selected, its value is 0, if selected – 255. If a pixel is semi-selected, its value
is lower than 255 and we see a frame of marching ants. The Quick Mask mode is often
used. When it is enabled, you can work on the selected part in the image in another
level, because editing operations are performed in the selection channel.
Quick mask
To access the Quick Mask, press the Toggle Quick Mask button that is on the bottom left
corner in the working window.