Gimp - 2.4 Guía Del Usuario
GNU Image Manipulation Program
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Figure 8.29: Multi layer example
GIMP also has similar modes which are used for the painting tools. These are the same twenty-one modes as the layer modes,
plus an additional two modes which are specific to the painting tools. You can set these modes from the Mode menu in the Tools
option dialog. In the equations shown above, the layer you are painting on is the ‘lower layer’ and the pixels painted by the tool
are the ‘upper layer’. Naturally, you do not need more than one layer in the image to use these modes, since they only operate on
the current layer and the selected painting tool. The two additional painting modes are described here.
plus an additional two modes which are specific to the painting tools. You can set these modes from the Mode menu in the Tools
option dialog. In the equations shown above, the layer you are painting on is the ‘lower layer’ and the pixels painted by the tool
are the ‘upper layer’. Naturally, you do not need more than one layer in the image to use these modes, since they only operate on
the current layer and the selected painting tool. The two additional painting modes are described here.
Behind
The Behind mode is only available from the Toolbox options, not as a layer mode from the Layers dialog. When you paint
with a tool in ‘Behind’ mode, it paints behind objects that are already painted on the layer. That means that this mode
only makes sense when you are painting on a layer that has transparent areas, otherwise you wouldn’t be able to see any
difference in the resulting image.
with a tool in ‘Behind’ mode, it paints behind objects that are already painted on the layer. That means that this mode
only makes sense when you are painting on a layer that has transparent areas, otherwise you wouldn’t be able to see any
difference in the resulting image.
In the example image, Wilber is on the top layer, surrounded by transparency. The lower layer is solid light blue. The
Bucket Fill tool was used, with an Affect mode of ‘Selection’, and the entire layer was selected. A pattern was used to
paint with the Bucket Fill tool.
Bucket Fill tool was used, with an Affect mode of ‘Selection’, and the entire layer was selected. A pattern was used to
paint with the Bucket Fill tool.
Color Erase
The Color Erase mode is only available from the Toolbox options, not as a layer mode from the Layers dialog. When you
paint with a tool in ‘Color Erase’ mode, it finds areas in the layer which have the current painting color and erases them,
turning those areas transparent. The layer must have an alpha channel (so that transparency is allowed) for an effect to be
seen.
paint with a tool in ‘Color Erase’ mode, it finds areas in the layer which have the current painting color and erases them,
turning those areas transparent. The layer must have an alpha channel (so that transparency is allowed) for an effect to be
seen.
In the example image, the color of the Bucket Fill tool was white, so white parts of Wilber were erased and the blue
background shows through.
background shows through.
8.3
Creating New Layers
There are several ways to create new layers in an image. Here are the most important ones:
• Selecting Layer → New Layer in the image menu. This brings up a dialog that allows you to set the basic properties of the new
layer; see the
section for help with it.
• Selecting Layer → Duplicate Layer in the image menu. This creates a new layer, that is a perfect copy of the currently active
layer, just above the active layer.
• When you ‘cut’ or ‘copy’ something, and then paste it using Ctrl-V or Edit → Paste, the result is a ‘floating selection’, which
is a sort of temporary layer. Before you can do anything else, you either have to anchor the floating selection to an existing
layer, or convert it into a normal layer. If you do the latter, the new layer will be sized just large enough to contain the pasted
material.
layer, or convert it into a normal layer. If you do the latter, the new layer will be sized just large enough to contain the pasted
material.