UMAX Technologies Astra MX3 Owner's Manual

Contents

UMAX Technologies Astra MX3 Owner's Manual Manual pdf 34 page image

34Using the Contrast BarThis setting controls the difference between light and dark areas in an image.Moving the slider on the scroll bar to the right decreases the gray shadesbetween light and dark areas. Moving it to the left increases the gray shadesbetween light and dark areas. The default setting is zero 0. The maximumcontrast setting is 100. The minimum setting is -100.Highlight BarThis setting defines the lightest (whitest) tones in the scanned image. If youbroaden the range that includes the highlight points, the pixels within thenewly specified range are remapped allowing you to see more details in acolor/gray image.Moving the slider on the scroll bar to the left increases the brightness. Movingit to the right decreases the brightness. The default setting is 255. Themaximum highlight setting is 255; the minimum setting is 1 (white).Shadow BarThe Shadow bar defines the darkest tones in the scanned image. Moving theslider on the scroll bar to the right decreases the brightness in shadowed areas.Moving it to the left increases the brightness in shadowed areas. The defaultsetting is 0. The maximum shadow setting is 254 (black); the minimumsetting is 0.Gamma BarThe Gamma bar alters the mid-range gray tones in the scanned image. Alloptical devices, such as monitors and scanners, have some variation in theirlight sensitivity characteristics. To get a scanned image with good results,VistaScan provides gamma adjustment capabilities so you can compensate forthis variation in your scanner.Moving the slider on the scroll bar to the right increases the brightness of themid-range gray tones. Moving it to the left decreases the brightness of the mid-range gray tones. The default setting is 1.5.Reset ButtonClick on the Reset button to cancel any changes you made and return thevalues to the default setting.Adjusting the Image TonesThe Curve command is another way to make precise adjustments in thehighlight, midtones, or shadow levels in your images. Using this feature