gimp/help/C/dialogs/layers/add_layer_mask.html

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>Add Layer Mask</TITLE
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>Add Layer Mask</A
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><A
NAME="AEN1741"
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><P
> Will add a layer mask to the currently active layer. A layer mask
is a one to control the transparency of the current layer . The
mask itself is a grayscale "image" where black pixels will make
the layer totally transparent and white pixels will make it
opaque.
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> Adding a mask to a layer has the same effect like if you could
add a second <A
HREF="../../layers/add_alpha_channel.html"
>Alpha
Channel</A
> for that Layer. In fact, both are applied to the
layer in the same way, first Alpha, then Mask.
</P
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><P
> The <SPAN
CLASS="QUOTE"
>"Fill"</SPAN
> frame enables you to choose the initial
fill of the layer mask. Black which will make the layer totally
transparent, White which will make the layer totally opace or the
alpha channel of the layer. When you choose the alpha channel the
transparency of each pixels will be mapped to a grayscale value in
the mask. If you want to further manipulate the transparency in a
layer this can be a very good option (e.g. maybe you have softly
erased some parts of the image and want to continue to manipulate
the transparency).
</P
><P
> To paint on the layer mask you have to activate it, you do that by
clicking on the thumbnail image of the mask. However you will not
see the mask, you will just see the result of your mask applied to
the layer. To see the mask you have to
<B
CLASS="KEYCAP"
>Alt</B
>-<SPAN
CLASS="MOUSEBUTTON"
>click</SPAN
> on the thumbnail. If
you want to see you layer without the mask applied,
<B
CLASS="KEYCAP"
>Ctrl</B
>-<SPAN
CLASS="MOUSEBUTTON"
>click</SPAN
> on the mask
thumbnail. Remember to click once again with the same modifier
key to exit the current "preview" state.
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