Canon scanner CanoScan FB 630U User Manual
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Top Page Glossary Contents Index 51 chapter 5 What is on the ScanGear CS Main Window? When the Gamma button is clicked, the Gamma sheet is displayed. Gamma refers to a process where mid-tones are shifted so that the lighter colors are lightened and darker colors are darkened. For example, let us say you scanned a photograph of a subject in a boat in a tree-lined lake and the shadows of the trees are dark enough and the white of the boat is light enough, but the blue in the sky, the blue of the water, and the blue of the subjectÕs clothing all look the same. By increasing the Gamma value of the image, the sky might become lighter and the water darker, giving a better contrast to the image. Gamma can be set even if there is no image in the Preview Area. The gamma setting will remain in effect for the next image previewing or scanning. Gamma Slide the Gamma slider to the left or right to set the gamma value or you can type the value directly into the box. The allowed range of values are 0.10 to 10.00, inclusive. Lager Gamma values darken the mid-tones of an image, and smaller Gamma values lighten the mid-tones. The shape of the tone curve changes to reflect the current gamma setting for the current Channel, and the image in the Preview Area changes to reflect the adjustment. Channel Click the Channel down-arrow and select one of the primary colors (Red, Green, Blue) for adjustment or leave the setting at Master to adjust all colors. Note
Top Page Glossary Contents Index 52 chapter 5 What is on the ScanGear CS Main Window? Reset Resets the default gamma setting. Histogram Sheet When the Histogram button is clicked, the Histogram sheet is displayed. Use the histogram to enhance an image when the image is either too light or too dark, like an overexposed or underexposed photograph. Increasing the darker tones with the histogram improves the contrast of the image.
Top Page Glossary Contents Index 53 chapter 5 What is on the ScanGear CS Main Window? Eyedroppers (Black-point, Mid-point, White-point) Click one of the three eyedroppers then click the portion of the image in the Preview Area that you want to sample, or enter values in the text boxes, or drag one of the three triangles at the bottom of the graph to adjust the value. The shape of the tone curve and histogram changes to reflect the current Histogram setting for the current Channel. A White-point value must be larger than a Black-point, and a Mid-point value must be between the Black-point and White-point. Channel Click the Channel down-arrow and select one of the primary colors (Red, Green, Blue) for adjustment or leave the setting at Master to adjust all colors. Load Loads a file with previously saved tone settings. Save Saves the current tone settings reflected in the histogram chart as a file so you can use the Load button to load the settings again whenever you need them. Reset Resets the default values: Black-point: 0 Mid-point: 128 White-point: 255 Note
Top Page Glossary Contents Index 54 chapter 5 What is on the ScanGear CS Main Window? Special Tone Curves Sheet When the Special Tone Curves button is clicked, the Special Tone Curves sheet is displayed. Channel Click the Channel down-arrow and select one of the primary colors (Red, Green, Blue) for adjustment or leave the setting at Master to adjust all colors.
Top Page Glossary Contents Index 55 chapter 5 What is on the ScanGear CS Main Window? Select Special Curve Click the down-arrow and select a setting from the drop-down list. These settings are designed to solve some of the most common problems with scanned images: overexposure, underexposure, or poor contrast: ¥ No correction ¥ Fix an image that is underexposed ¥ Fix an image that is overexposed ¥ Fix an image that is low contrast ¥ Fix an image automatically ¥ Edit custom curve Load Click to load a file with previously saved curve settings. Save Saves the current curve settings as a file so you can use the Load button to load the settings again whenever you need them. Reset Resets the default values for the curve.
Top Page Glossary Contents Index 56 chapter 5 What is on the ScanGear CS Main Window? Editing a Special Tone Curve Directly In the Special Tone Curves graph you can edit the curve directly. 1. Click on the curve and drag each curve anchor point until the desired effect is achieved. 2. To remove an anchor point altogether, drag the anchor point off the graph area.
Top Page Glossary Contents Index 57 chapter 5 What is on the ScanGear CS Main Window? Here are some hints for editing curves: ¥ Curve handles are drawn on a white background as a red dot to signify that they are editable. When the cursor is over the handle, it changes to a crosshair. ¥ Curve end points can be selected and dragged to any point in the curve but cannot be deleted. ¥ Up to 15 points can be added to a curve by clicking anywhere in the curve box. ¥ If you drag a point outside of a curve box, it will be deleted from the curve and a new curve will form with the remaining points. ¥ The X and Y axes on the curve chart represent the input image color and output image color. When you add a handle to the curve and drag that handle toward the white areas, the preview image tones are adjusted to reflect the change. ¥ More than one handle cannot be positioned on a vertical line but more than one handle can be positioned on a horizontal line so you can have several handles on a horizontal line.
Top Page Glossary Contents Index 58 chapter 5 What is on the ScanGear CS Main Window? The Scanner Sheet When you click on the FB630U/FB636U Tab, the Scanner sheet opens. Paper Size Click the down-arrow and select a paper size from the drop-down list. These sizes are available: Business Card, Statement, B5, Executive, A4, Letter, Full Platen. Changing the Paper Size will refresh the image in the Preview Area. Note
Top Page Glossary Contents Index 59 chapter 5 What is on the ScanGear CS Main Window? Threshold Threshold determines whether portions of an original are scanned as black or white. Drag the slider right to make the document lighter or drag it left to make the document darker. You can also enter the values directly into the entry box (range: 0~255). This feature is enabled only when the Scan Mode on the Main sheet has been set for Black and White. Otherwise, this slidebar is dimmed and disabled. Descreen Click this check box if you want ScanGear CS to conduct moirŽ reduction to improve the overall image quality. MoirŽ patterns are dot-like patterns that interfere with processing images for professional use and are usually caused by poor dithering resulting from scanning images from newspapers, books, magazines, etc. Test Scanner Click this button to open the Scanner Diagnostics dialog box. Click the Start button in the Scanner Diagnostics dialog box to test your Scanner. After the test is complete, a message is displayed to inform you of the results. If a problem is reported after the test, use your scanner manual to troubleshoot the problem. During the test, do not open the Document Cover of the scanner. Calibration Click this button to start calibration. Calibration is the adjustment of color processing for input and output devices so the colors in the scanned image match the colors you see on the computer screen and in the printed image. During calibration, do not open the Document Cover of the scanner.
Top Page Glossary Contents Index 1-60 chapter 6 Troubleshooting Pre-Scan Checklist How to Avoid Problems Troubleshooting