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This tool lets you extract the foreground from the active layer or from a
selection. It is based on the SIOX method (Simple Interactive Object
Extraction). You can visit its Web page at
[SIOX].
2.8.1. Directions for use
The creation of a selection with this tool works in a couple of steps:
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Roughly select the foreground you want
to extract. When you select this tool, the mouse pointer goes with
the lasso icon. It actually works like the Fuzzy Select tool.
Select as little as possible from the background.
As soon as you release the mouse button, the non selected part of
the image is covered with a dark blue mask. If the selection is not
closed, its ends will be linked automatically together by a straight
line. The mouse pointer goes now with the Paint-brush icon for the
next step.
-
Draw a line through the foreground: using the
paintbrush, whose size can be changed in options, draw a continuous
line in the selected foreground going over colors which will be
kept for the extraction. The color used to draw the line is of no
importance; not using the same color as foreground is better. Be
careful not painting background pixels.
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When you release the mouse button, all non-selected areas are in
dark:
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You still have to press the Enter key to get the
wanted selection:
![[Note]](images/note.png)
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Note |
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Until you press Enter, you can't undo this selection
by
Ctrl+Z nor by
→ ,
and the Undo History is not concerned. To delete this selection, you
must select another tool.
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2.8.2. Activating the Tool
You can activate the Foreground Select tool in two ways:
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by clicking on the tool icon
in the Toolbox,
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through
→ →
in the image menu.
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This tool has no shortcut, but you can set one using
→ → → → →
2.8.3. Key modifiers (Defaults)
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Ctrl
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By pressing the Ctrl key, you can switching
between foreground and background selection painting.
Normally, tool options are displayed in a window attached under the
Toolbox as soon as you activate a tool. If they are not, you can access
them from the image menu bar through
→ → which opens the option window of the selected tool.
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Mode; Antialiasing; Feather edges
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See Selection Tools
for help with options that are common to all these tools. Only
options that are specific to this tool are explained here.
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Contiguous
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If this option is enabled, only the area contiguous to the stroke
will be selected. Otherwise all the areas with same colors will be
selected.
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Interactive refinement
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Here are some options to work more precisely on your selection:
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Mark foreground
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default option. The foreground color of the Toolbox is used
to paint. Colors covered by the painted line will be used
for extraction.
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Mark background
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You can access this option either by clicking on the radio
button or, more simply, by pressing the Ctrl
key. The mouse pointer goes with a small eraser icon. The used color is the background color of
Toolbox.
The pixels of the selection which have the same color as the
“erased” pixels will NOT be extracted.
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Small brush / Large brush
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This slider lets you adapt the size of the brush used to
paint the line. A small brush fits well thin details.
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Smoothing
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The slider lets you remove small holes in your selection.
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Preview color
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You can select between Red, Green and Blue to mask the image
background.
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Color Sensitivity
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This option uses the
L*a*b color model. If your
image contains many pixels of the same color in different tones,
you can increase the sensibility of the selection for this
color.
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