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Manipulating Graphics with The GIMP 205
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custom template, select File > Dialogs > Templates and use the controls offered by the window that
opens.
In the Image Size section, set the size of the image to create in pixels or another unit. Click the unit
to select another unit from the list of available units. The ratio between pixels and a unit is set in
Resolution , which appears when the Advanced Options section is open. A resolution of 72 pixels per
inch corresponds to common screen display. It is sufficient for Web page graphics. A higher
resolution should be used for images to print. For most printers, a resolution of 300 pixels per inch
results in an acceptable quality.
In Colorspace , select whether the image should be in color ( RGB ) or Grayscale . For detailed
information about image types, see “Image Modes” on page 212 . Select the Fill Type for the new
image. Foreground Color and Background Color use the colors selected in the toolbox. White uses a
white background in the image. Transparent creates a clear image. Transparency is represented by a
gray checkerboard pattern. Enter a comment for the new image in Comment .
When the settings meet your needs, press OK . To restore the default settings, press Reset . Pressing
Cancel aborts creation of a new image.
14.3.2 Opening an Existing Image
To open an existing image, select File > Open or press Ctrl+O. In the dialog that opens, select the
desired file. You can also press Ctrl+L and type directly the URI of the desired image. Then click
Open to open the selected image or press Cancel to skip opening an image.
14.3.3 Scanning an Image
Instead of opening an existing image or creating a new one, you can scan one. To scan directly from
The GIMP, make sure that the package
xsane
is installed. To open the scanning dialog, select File
> Acquire > XSane: Device dialog .
Create a preview when the object to scan is smaller than the total scanning area. Press Acquire
preview in the Preview dialog to create a preview. If you want to scan only part of the area, select the
desired rectangular part with the mouse.
In the xsane dialog, select whether to scan a binary (black and white without shades of gray),
grayscale, or color image and the required scan resolution. The higher the resolution, the better the
quality of the scanned image is. However, this also results in a correspondingly larger file and the
scanning process can take a very long time at higher resolutions. The size of the final image (both in
pixels and bytes) is shown in the lower part of the dialog.
In the xsane dialog, use the sliders to set desired gamma, brightness, and contrast values. These
sliders are not available in binary mode. Changes are visible in the preview immediately. Once all
settings have been made, click
Scan to scan the image.
14.3.4 The Image Window
The new, opened, or scanned image appears in its own window. The menu bar in the top of the
window provides access to all image functions. Alternatively, access the menu by right-clicking the
image or clicking the small arrow button in the left corner of the rulers.
File offers the standard file options, such as Save and Print . Close closes the current image. Quit
closes the entire application.