Canon scanner CanoScan FB 630U User Manual
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Top Page Glossary Contents Index 71 Glossary Black-point The darkest portion of an image scanned as Color or Grayscale. When you click on the image with the Black-point eyedropper, all tones darker than the selected sample tone are adjusted to black. See also Mid-point, White-point. Brightness The overall amount of lightness or darkness in an image. An image with maximum brightness tends toward white; an image with minimum brightness tends toward black. While contrast refers to the range and number of tones in an image, brightness refers to the intensity of tones. Calibration For scanning, calibration refers to the adjustment of color processing for input and output devices on a computer, so that the colors match throughout the process. For example, calibration ensures that the color image scanned on a scanner matches the original image when it is displayed on the computer monitor, as well as printed on a color printer. Canon ColorGear Color Matching CanonÕs process of matching the color profile of the input device (scanner) with the color profile of the output device (monitor), to yield the most accurate color image. Canon ColorGear Color Matching is compliant with ICC (International Color Consortium) guidelines. ICC is a group of hardware and software companies which developed cross-platform, industry-standard guidelines for color devices. Canon ColorGear Color Matching is also compatible with the ICM (Image Color Matching) component of Windows 98.
Top Page Glossary Contents Index 72 Glossary Canon ImageTrust CanonÕs process of converting grayscale image (8 bits per pixel) to a black and white image (1 bit per pixel) to yield a more effective scan for optical character recognition (OCR) applications. Channel See Color Channels. Clear button The button that removes the current image from the Preview Area. CMY An acronym for cyan, magenta, and yellow, the color complements to red, green, and blue. CMYK An acronym for cyan, magenta, yellow, and black, the four-color process used in most commercial printing. (The black ÒKÓ stands for ÒBlacKÓ.) Color Channels The red, green, or blue components of a color image. Color images contain 8 bits per pixel each for red, green, and blue channels, therefore each pixel has 24 bits. If you are scanning a color image, you can change the brightness and contrast of the individual red, green, and blue tones in your image. The Master channel is a combination of the three.
Top Page Glossary Contents Index 73 Glossary Color Matching The range of colors your scanner can see may not match the range of colors your video monitor can produce. Color matching lets your system display colors so that the color on your monitor and printer matches the colors scanned. See also Canon ColorGear Color Matching. Complementary colors Red, green, and blue can be thought of as complementary colors to cyan, magenta, and yellow. These colors cancel each other out when combined in equal amounts. Similarly, adding a small amount of one color reduces its complement by that amount. Contrast Contrast refers to the difference between the lightest light and the darkest dark in the image. A low contrast value indicates that the difference between dark shades and light shades is not very great. A high value indicates a great difference between dark and light shades. While brightness refers to the intensity of tones in an image, contrast refers to the range and number of tones in an image. Crop The action of selecting part of an image. The Crop button on the ScanGear CS main window lets you select part of a preview image and re-preview or scan only that selected part. Curve chart The graph displayed in the Tone sheet settings for the Auto Tone, Contrast/Brightness, Gamma, Histogram, and Special Tone Curves features. This graph describes the relationship between the color characteristics of the previewed image and the available feature settings.
Top Page Glossary Contents Index 74 Glossary Curve file A file containing Special Tone Curve settings. (Tone sheet-Special Tone Curves) Custom curves A user-defined Special Tone Curve that may be saved in a file. (Tone sheet-Special Tone Curves) Custom Resolutions The Custom Resolutions dialog box lets you create a scan resolution not found in the preset list, but supported by the input device. Default The preset factory settings on hardware or software. Digitizing The process of converting an image into computer-usable (digital) information that can be saved as a file, printed, faxed, or otherwise manipulated on your computer. dpi The abbreviation for dots per inch. The resolution of a monitor or printer is measured in how many dots per horizontal inch it can display or print. See also Pixel, Optical resolution, Resolution. Driver The software that lets you run a peripheral device such as a printer, scanner, video monitor, and so on. ScanGear CS is a scanner driver.
Top Page Glossary Contents Index 75 Glossary End points The points at each end of a preset or custom tone curve. The curve end points cannot be deleted. If they are dragged to or past an edge, they remain on the edge. Add points to the curve by clicking anywhere in the curve box. (Tone sheet - Special Tone Curves) Exective A U.S. standard paper size measuring width x height:7.25 x 10.5 in. (184.2 x 266.7 mm) Eyedropper A Histogram tool used to sample the Black-point, Mid-point, and White-point areas in the previewed image. (Tone sheet - Histogram) Full Platen The maximum scannable area on the scannerÕs document glass, 8.5 in. x 11.7 (width of U.S. Letter and length of A4 paper sizes). Gamma Curve Tool The Gamma Curve Tool lets you change the midtones of colors to increase the contrast between colors, and enhance the overall image. When you increase the Gamma value, light colors are made lighter, and dark colors are made darker. The graphed curve represents the relationship between input and output values for the midtones of the preview image. Gamma correction The process of adjusting the midtones to improve an image.
Top Page Glossary Contents Index 76 Glossary Grayscale Grayscale refers to a single-channel image made up of 256 shades of gray, ranging from white to black, that represent all tones in an image. Height The Height text box contains the height of the current selection, or, if there is no selection, the maximum vertical output size, based on the currently selected Paper Size. Histogram Tool The Histogram displays the distribution of bright and dark pixels for each color channel in the previewed image. The Eyedropper tool on the histogram graph lets you redefine the tonal profile. You can save the settings for Black-point, Mid-point, and White- point settings in a histogram file with the extension *.HST. Image Type The type of image, such as color or grayscale. JPEG file format An image file format developed by the Joint Photographic Experts Group, as a standard for storing color images in less space, with the file format .jpg. Keep Proportions button The Keep Proportions button affects the selection and the Width and Height text boxes. When you click the Keep Proportions button, the image size is maintained in the same proportion whenever you change either the width or the height.
Top Page Glossary Contents Index 77 Glossary Low contrast An image that has low contrast does not have many distinct differences between tones. Mid-point The midtone portion of the image scanned as Color or Grayscale. When you click on the image with the Mid-point eyedropper, all tones between the black-point and the white-point are adjusted in relation to the mid-point setting. Mid-tone Mid-tones are the middle range of tones in an image, between highlights and shadows. Midtones can be adjusted for color and grayscale images with the Gamma tool. Mode The type of scan used to scan an image, differentiated by the number of bits per pixel. ScanGear CS has the following Scan Modes: Color, High Definition Color, Grayscale, Text Enhanced, and Black and White. MoirŽ reduction MoirŽ reduction can be switched on with the Descreen button on the Scanner sheet. MoirŽ patterns are caused by poor dithering as a result of scanning images from published materials like newspapers, magazines, books, etc. When the Descreen feature is on, moirŽ reduction smooths the overall appearance of the image and enhances image quality.
Top Page Glossary Contents Index 78 Glossary OCR (Optical Character Recognition) OCR (Optical Character Recognition) software converts text images into actual text characters readable by a word-processing program or similar application. The Text Enhanced scan setting sharpens black and white contrast to assist in the accurate recognition of characters in OCR software. Optical resolution A scannerÕs resolution capability. See also dpi, Resolution. Output Dimensions The final dimensions of the scanned image, based on paper size, cropping, and scaling. Output file formats The format in which a file is saved to disk such as Windows Bitmap (*.bmp), Tagged Image File (*.tif), JPEG (*.jpg). Output size The size of the acquired image, calculated by multiplying the width and height by the scale percentage. Overexposed An image that was exposed to too much light while it was being photographed. Paper Size An option on the Scanner sheet that determines the initial scannable area. For flatbed scanners, standard paper sizes from B5 to A4 are available.
Top Page Glossary Contents Index 79 Glossary Pixel An acronym for Òpicture element,Ó a pixel is the smallest element used to create a screen image. It can contain up to 24 bits of color information. Platen The scannerÕs document glass, where originals are placed for scanning. Preset Curves A set of curves designed to fix common photographic image problems such as underexposure, overexposure, or low contrast. Preview Area The area located to the left of the ScanGear CS main window where the image is displayed before the scan occurs. When you click the Preview button, the image on the scanner is scanned into the Preview Area, but not acquired by the application. Preview Image Cache When the preview image cache feature is switched on, the image in the Preview Area is saved and displayed the next time ScanGear CS is launched from the parent software application. To switch this feature on and off, open the Preferences sheet and click the button for ÒSaved image will be displayedÓ. Proportion The ratio of width to height. When you click the Keep Proportions button, the image size is maintained in the same proportion whenever you change either the width or the height.
Top Page Glossary Contents Index 80 Glossary Resolution The degree of detail, translated into the number of pixels or dpi, which a device such as a scanner, video monitor, printer, or other image-displaying device, can display or reproduce. See also dpi, Pixel, Scan Resolution. RGB RGB is an acronym for red, green, and blue, the onscreen color complements to print colors cyan, magenta, and yellow. Rotate Left The Rotate Left tool rotates the preview display 90 degrees counterclockwise. If the Preview Area is in portrait orientation, it becomes landscape and vice versa. Rotate Right The Rotate Right tool rotates the preview display 90 degrees clockwise. If the Preview Area is in portrait orientation, it becomes landscape and vice versa. Sampling In scanning, sampling is the process of measuring and recording the tonal or color value in an image and converting it to digital information. Scale The Scale setting lets you specify an output size for the selected image as a percent of the original width and height. Scan Button Clicking the Scan Button scans the original and sends it to the parent software application.