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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 raster
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 se-
lected 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
Section 14.5.2, "Selecting Parts of Images"
(page 247)). 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
Section "Changing the Canvas
Size"
(page 247).
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.
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GNOME User Guide
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