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,...
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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.
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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...
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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.
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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...
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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.
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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,...
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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
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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....
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Top Page Glossary Contents Index 1-60 chapter 6 Troubleshooting Pre-Scan Checklist How to Avoid Problems Troubleshooting