Selecting Parts Of Images - Novell LINUX ENTERPRISE DESKTOP 11 - APPLICATION GUIDE 17-03-2009 Application Manual

In the dialog that opens, enter the new size. By default, the width and height maintain
the same proportions as the current image. To change this, click the chain icon.
After adjusting the size, determine how the existing image should be positioned in
comparison to the new size. Use the offset values or drag the box inside the frame at
the bottom. When satisfied with the changes, click Resize to change the canvas size.
Click Reset to restore the original values or Cancel to cancel the canvas resize.

20.5.2 Selecting Parts of Images

It is often useful to perform an image operation on only part of an image. To do this,
the part of the image with which to work must be selected. Areas can be selected using
the select tools available in the toolbox, using the quick mask, or combining different
options. Selections can also be modified with the items under Select. The selection is
outlined with a dashed line, called marching ants.
Using the Selection Tools
The main select tools are rather easy to use. The paths tool, which can also be used for
more than selecting, is more complicated so is not described here. In the tool options
for the other select tools, use one of the icons in the Mode row to determine whether
the selection should replace, be added to, be subtracted from, or intersect with an existing
selection.
Rect Select
This tool can be used to select rectangular or square areas. To select an area with
fixed aspect ratio, width, height or size, activate the Fixed option and choose the
relevant mode in the Tool Options dialog. You can also activate the Fixed option
by holding Shift while selecting a region.
Ellipse Select
Use this to select elliptical or circular areas. The same options are available as with
rectangular selection. The Fixed option or holding Shift during selection can be
used to produce a circle.
Free Select (Lasso)
With this tool, you can create a selection based on combination of freehand drawing
and polygonal segments. To draw a freehand line, drag the mouse over the image
with the left mouse button pressed. To create a polygonal segment, release the
Manipulating Graphics with The GIMP 213