Color-depth list box: this option specifies the color depth of the scanned image. The default setting is 8 bit for each RGB channel. 16-bit and 16-bit linear can be made. Because 16 bit linear color depth does not make any gamma corrections, the scan of a negative will produce a negative image. 16-bit and 16-bit linear images can only be saved in the TIFF file format. Auto Dust Brush cannot be used with 16-bit linear color depth. Pixel Polish cannot be used with 16-bit and 16-bit linear color depth. Some image-processing applications including Photoshop Elements cannot open 16-bit image files.
Multi-sample list box: a multi-sample scans reduces random noise in the image by analyzing the data of each sample scan; 2, 4, and 8 samples can be made. The more samples taken, the less random noise in the image and the longer the scanning time.
Auto Dust Brush level slider: this slider adjusts the degree of retouching in three levels. The level is initially set to medium. The effect of the Auto Dust Brush cannot be evaluated in the pres- can image. This function is activated with the Auto Dust Brush button in the main window (p. 39).
Index-scan-priority radio button: this option allows the selection of high-speed index scans or a quality index scans with prescans. Simply click the appropriate radio button.
The speed setting allows faster index scans. Only index thumbnails are created with this setting. The scanner will make separate scans when prescans are required. The autofocus function is dis- abled during the index scan.
The quality setting makes an index thumbnail and prescan of each image. Double clicking on the index thumbnail immediately displays the larger prescan image. Prescan images are easier to use to make critical decisions over image quality. Image corrections can only be applied to prescans. The setting increases index scanning time.
Color-matching:this option turns color matching on. For more information, see the color match- ing section on page 60.
Rotate-all-frames-180-degrees check box: this option rotates all APS index frames 180 degrees in the index scan window.
Cancel button: to cancel any settings made and close the window.
Help button: to open the help window.
OK button: to apply the preference settings and close the window.