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Manipulating Graphics with The GIMP 207
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To save the image in the chosen format, press Save . To abort, press Cancel . If the image has features
that cannot be saved in the chosen format, a dialog appears with choices for resolving the situation.
Choosing
Export , if offered, normally gives the desired results. A window then opens with the
options of the format. Reasonable default values are provided.
14.5 Editing Images
The GIMP provides a number of tools for making changes to images. The functions described here
are those most interesting for home users.
14.5.1 Changing the Image Size
Once an image is scanned or a digital photograph is loaded from the camera, it is often necessary to
modify the size for display on a Web page or for printing. Images can easily be made smaller either
by scaling them down or by cutting off parts of them. Making an image larger is much more
problematic. Because of the nature of pixel graphics, quality is lost when an image is made larger. It
is recommended to keep a copy of your original image before scaling or cropping.
Cropping an Image
Cropping an image works like cutting the edges off a piece of paper. Select the crop tool from the
toolbox (it resembles a scalpel) or with
Tools > Transform Tools > Crop & Resize . Click a starting
corner and drag to outline the area to keep.
A small window opens with information about the starting point and the size of the selected area.
Adjust these values by clicking and dragging a corner of the crop box or by adjusting the values in
the window.
From Selection adjusts the crop to fit the current selection (selections are explained in
“Selecting Parts of Images” on page 208 ). Auto Shrink makes the crop smaller based on color
changes in the image.
Press Cancel to abort the crop. Press Crop to crop the image. The results of Resize are identical to
those of Change Canvas Size , described in “Changing the Canvas Size” on page 207 .
Scaling an Image
Select Image > Scale Image to change the overall size of an image. Select the new size by entering it
in Width or Height . To change the proportions of the image when scaling (this distorts the image),
click the chain icon to the right of the fields to break the link between them. When those fields are
linked, all values are changed proportionately when the value in one of the fields is changed. Adjust
the resolution with
X resolution and Y resolution .
Interpolation is an expert option that controls the scale method. When finished adjusting the size,
press Scale to scale the image. Reset restores the original values. Cancel aborts the procedure.
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.