Table of Contents
Advertisement
Changing the Canvas Size
Changing the canvas size is like putting a mat around an image. Even if the mat is
smaller, the rest of the image is there, but you can only see part of it. If the mat is larger,
you see the original image with extra space around it. To do this, select Image > Canvas
Size.
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.
18.5.2 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. In the tool options, select
among Free Select, Fixed Size, and Fixed Aspect Ratio to control the shape and
size of the selection. To make a square selection in the free select mode, hold Shift
while selecting a region.
Manipulating Graphics with The GIMP
245
Advertisement
Table of Contents
Troubleshooting
