HP Scanjet 7450c HP Scanjet 7400C Series Scanner Mac - (English) User Manual - Page 117
m, n, o, noise reduction
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Back to TOC m maximum pixel depth This option enables higher bits per pixel when the scan is sent to the software. When it is off, 8 bits per pixel are returned for grayscale and 24 bits for color. When it is turned on, 16 bits per pixel are returned for grayscale and 48 bits for color. midtones The gray shades of an image. Midtones are usually between 30% and 70% black. Midtone control adjusts the brightness of gray levels in the image so that the lightest and darkest portions of the image can be properly displayed on your monitor. The higher the setting, the brighter the image appears on your monitor. millions of colors Color images that are composed of three 8-bit color channels. When combined, the red, green, and blue channels provide up to 16 million colors. Sometimes referred to as "true color" and "24-bit color." moiré An undesirable pattern in color printing that results from incorrect screen angles of overprinting halftones. Moiré patterns usually result when you scan a halftone, when you scan images taken directly from a magazine, or when you scale an image in an image editor after it is scanned. 117 n negative template The cutout that comes with the optional transparency adapter that is placed on the scanning glass. Negatives are then placed in the template. noise reduction This option reduces the noise (unwanted specks) in an image by applying software algorithms to minimize the effects of noise in the scanner electronics. o OCR See optical character recognition. optical character recognition Abbreviated OCR. A technology that recognizes letters in a scanned image and converts them into ASCII characters, or editable text. optical resolution The true resolution of a scanner, the resolution at which the scanner captures images. See also: interpolated resolution, resolution. optimized palette A palette or color table that contains the pixel colors present in an image.