This section explains how to use a scanner with Kooka and GIMP. Please refer to Section 9.8, “Installing and Sharing Scanners” for instructions on how to set up your scanner.
Choosing the Scanning Media Device. The first time you launch Kooka, a dialog prompts you to choose the scanning device to use. Check the box to always use this device.
Most modern scanners boast high resolutions, such as 1200, 1600 or 2400 DPI (Dots Per Inch). But it would be a mistake to perform all of your scanning at the maximum available resolution. You will notice very little — if any — quality difference between a 300 and a 600 DPI image scan, but the file size will grow exponentially, up to many MBs of disk space for a single image file.
The resolution value should be chosen according to the device on which the image is to be reproduced. For images to be viewed on computer monitors, e.g. for web sites, the resolution should be close to typical monitor resolution values, between 70 and 100 DPI. Higher values will result not only in bigger images, but the dimensions will also increase, so that an image scanned at 160 DPI instead of 80 will be about twice as large .
Higher values should be chosen only for specific uses, such as enlarged images on very high quality printers, or quality scans of black and white originals. You will have to experiment a little until you're satisfied with the results.
By installing the
ocrad package, you will be able to use
Kooka to perform OCR tasks.
The Figure 5.12, “Scanned Document in Kooka” shows Kooka
with a document scanned as explained in Section 5.3.1, “Scanning Documents with Kooka”.
 However scanning at a higher resolution and then reducing the resulting image size using graphic manipulation software such as GIMP is one method often used to obtain better results than directly scanning at the desired final resolution.