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Scanning 3.7 3 Scanning Balance Tab Color Channel The Color Channel radio buttons are used to specify the color channel in which to change the Highlight, Shadow and Midtone values. The only channel available to be selected when using your machine to scan is the Gray channel. Red, Green and Blue are used for scanners capable of scanning documents in color. Highlight The Highlight value represents the lightest value in an image. All pixels above this point will be rendered as pure white. If you subsequently broaden the highlight points on the Level Adjustment graph, the pixels will be remapped within the new range, thus allowing you to see more detail in the image. The Highlight scroll bar allows you to manually set a highlight level. The default for the Highlight settings is 255. You can increase or decrease the highlights in a particular image as needed by adjusting this scroll bar. The value in the adjacent box will change in the range 1 to 255 as the slider moves. Shadow The Shadow value represents the darkest value in an image. All pixels below this point will be rendered as pure black. If you subsequently broaden the shadow points on the Level Adjustment graph, the pixels will be remapped within the new range thus allowing you to see more detail in the image. The default value for Shadow is 0. You can increase or decrease the shadows in a particular image as needed by adjusting this scroll bar. 3.8 Scanning Midtone All optical devices such as monitors and scanners have some differences in their light sensitivity characteristics. Samsung TWAIN provides Midtone adjustment for you to compensate for these differences in your scanner, and it produces better scanned images. To change the Midtone value, move the slider to the left or right to change the values in the adjacent text box. The value in the adjacent box will change in the range 0.1 to 10.0 as the slider moves. Ordinarily, good results can be obtained from your machine by leaving the slider at its default value of 1.00. Advanced Selection The advanced selection will present features that allow you to modify the Level Adjustment and the Tonal Map of the document. For both the Level Adjustment and the Tonal Map functions, the window displayed contains small representations, known as thumbnail views, of the original and enhanced images (Samples 1 and 2). To activate the Level Adjustment or Tonal Map functions, click on the Advanced... button at the bottom of the Balance tab. When this button is selected, the Level Adjustment window is displayed by default. 3 Scanning Scanning 3.9 Level Adjustment The Level Adjustment dialog box shows the distribution of brightness levels in your image. To adjust the histogram plot, drag the triangles, located below the horizontal bar to the desired values. The left (black) triangle changes the shadow levels. The right (white) triangle changes the highlight levels. The middle (gray) triangle controls the midtone levels. Highlight control Shadow control Level Adjustment tab Midtone (Gamma) control By varying the Shadow and Highlight points you can change the relative shades and highlights of the image. The Shadow point represents the darkest value and the Highlight point is the brightest value. The Midtone point represents the Gamma setting for your particular screen. On the histogram, the Shadow and Highlight scales are divided into 255 units. Therefore, all pixels in the original that are darker than the current shadow point are now completely black in the enhanced image. Conversely, all pixels in the original that are brighter than the current highlight point are now completely white in the processed image. Setting the highlight point to 200 renders all pixels greater than or equal to 200, on the original, completely white in the processed image. Similarly setting the Shadow point to 200 renders all points less than or equal to 200, on the original, completely black in the enhanced image. Photographers often refer to these effects as Ohigh-keyO or Olow-keyO. High-key is an image pushed to the white end, and low-key is an image pushed to the black end of the tone curve. 3.10 Scanning The Midtone is a relative measure of the gamma of your monitor. The scale for Midtone ranges from 0 to 255. The gamma curve is a geometric series. This means that at a value of 255 it tends to infinity. The Midtone is bound by the Shadow and Highlight terms and cannot exceed them at any time. So, if the Highlight is set to 255 and the Shadow is set to 0, a gamma of 1 is equal to a Midtone of 128. Similarly, if the Shadow is set at 200 (lower boundary) and the Highlight is set at 220 (upper boundary), a gamma of 1 is equal to a Midtone of 210. Operation: 1. Select the Advanced... button on the Balance tab. This will display the Level adjustment window. 2. On the histogram, use the mouse key to click on the black, gray ,or white triangles to make changes to the Shadow, Midtone and Highlight respectively. 3. To see the changes and compare the...
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