Select Applications Graphics XSane Image Scanner. On startup, the program in Java

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1. Select Applications Graphics XSane Image Scanner. On startup, the program
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will attempt to detect your scanner. If it finds a compatible model, XSane will start. If the scanner isn t recognized, a dialog box will appear telling you so.
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2. XSane consists of a handful of windows, including the main program window, the
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Standard Options dialog, the Histogram window, and the Preview window. You can close the Standard Options and Histogram windows for the moment and concentrate on the main XSane program window, which should be similar in appearance to the TWAIN scanner drivers you might have used under Windows.
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3. At the top of the window is the automatic document feeder option, where you can
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set the number of pages in the feeder to scan in one sitting. If your scanner does not have an automatic document feeder, you can do this manually by changing the paper yourself immediately after the previous paper has been scanned.
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4. Beside the automatic document feeder option is the XSane mode drop-down list.
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Here, you can select from a variety of scanning modes, such as those to scan documents for faxing. However, in most cases, the Save setting is best. This lets you preview your scans and then save them to disk if you re happy with them.
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5. Beneath this is the filename field. Here you should type the filename you wish to
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use for the scanned file. XSane can save in a variety of file formats, and it detects which you want to use from the file extension you choose. For example, typing picture.jpg will cause the picture to be saved as a JPEG image. Typing picture.tif will cause the image to be saved as a TIFF file.
6. Beneath the filename field, on the left, is the filename number count. This is used
if you wish to scan many images in succession a number is added to the end of the filename, and this control configures the increment. A setting of +1 is fine.
7. Beneath the filename field, and to the right, is the type drop-down list, by which
you can force a certain file type to be used when saving files. However, leaving this at the default By Ext is best. This means that, as mentioned previously, you can define the type of image saved by the filename extension.
8. Next down is the color/monochrome drop-down list. Here, you can select to scan
Lineart (binary), Gray (grayscale), Halftone, or Color. If you select anything other than Lineart, additional sliders will appear to let you control the gamma, brightness, and contrast of the scanned image, in that order. In addition, several other buttons will appear at the bottom of the program window, all of which you can leave at default settings. Remember that hovering the mouse cursor over each will explain what it does.
9. Next is the source medium type drop-down list. Here you can specify the type of
medium you are scanning whether it s a full-color picture, a slide/transparency, or a negative. For normal operations, select Full Color Range.
10. Next is the dots per inch (DPI) setting. Generally speaking, 300 DPI is acceptable
for scanned photos, while 150 DPI will be acceptable for artwork such as diagrams.
11. To scan a preview, click the Acquire Preview button within the preview window.
The results should be something similar to what s shown in Figure 8-11.
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Figure 8-11. The XSane program works a little like TWAIN drivers under Windows and makes
scanning easy.
12. When the preview scan has finished, you can adjust the brightness/contrast set-
tings using the sliders in the XSane program window (assuming you selected color scanning earlier). You should also click and drag to crop the image in the preview window, if XSane doesn t do so automatically.
13. When you re satisfied with the preview, click the Scan button in the main XSane
program window. The image will then be scanned at your chosen resolution and saved to your /home directory, using the filename you specified earlier.
Installing 3D Drivers and Activating Desktop Visual Effects
The modern trend is for operating systems to incorporate flashy graphical effects into ordinary desktop functions. For example, when windows are minimized in Windows Vista, they physically shrink and fade down to the taskbar. Under Mac OS X, program
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windows appear to be poured into the Dock when minimized. In Windows Vista, when you press Alt+Tab to switch through open programs, the program windows are previewed vertically in a graphical arrangement, and you can flick through them, rather like searching through a card index. These effects are achieved using the 3D processing power of the computer s graphics card, even though the effects aren t necessarily 3D in nature.
Note On a technical level, the technique is known as compositing. What you see on the screen is first
drawn in the graphics card memory and then transferred to the screen, rather than everything simply being drawn directly onto the screen.
Ubuntu includes similar desktop visual effects, courtesy of a system called Compiz Fusion (www.compiz-fusion.org). However, all desktop visual effect systems have a couple requirements, and these apply to Ubuntu as well: For desktop effects to work, your graphics card (or motherboard graphics chipset) must be comparatively recent. Examples include the ATI Radeon, nVidia GeForce, and Intel GMA product lines. Most graphics cards manufactured within the last two or three years with a graphics processing unit (GPU) should be adequate, and very recent models definitely will work. The correct graphics drivers must be installed. Some of Ubuntu s built-in graphics drivers lack the necessary 3D functionality to support desktop effects. Currently, Intel GMA and some ATI Radeon graphics cards are supported by default because Intel and ATI provide open-source 3D-capable drivers. For other hardware, including nVidia cards, you will need to manually install a proprietary driver, which is not difficult to do.
Note You only need to install the proprietary driver if you wish to utilize desktop visual effects. Ubuntu
includes a default 2D graphics driver that provides excellent functionality for everyday desktop use.
Some proprietary 3D graphics drivers are provided under Ubuntu, but only if opensource equivalents are missing. It is hoped that open-source drivers will one day replace the need for proprietary drivers. So do you actually need to install new drivers If you find that desktop effects are working, then the correct drivers are already installed. A good way to test this is to hold down Ctrl+Alt and then tap the left or right arrow key. This will switch to the next virtual desktop. If the entire desktop physically slides out of the way, then desktop effects are activated. If the desktop remains static and a small dialog box appears in the center of the screen to let you choose a virtual desktop, then desktop effects are not activated.
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