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Canon 4.1 User Manual
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Contents
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68GrayscaleAn image mode that scans only the brightness data of an image and reproducesthe image in white, black and 254 shades of gray (256 tones or 8 bits).HistogramA graph indicating the distribution of brightness data in an image. A dot isassigned a brightness value ranging from 0 (shadows) to 255 (highlights). Thehistogram shows how much image data there is at each brightness value.Adjusting the histogram changes the image contrast.Image FileImages are expressed as collections of dots with varying color and brightnessvalues that are digitized in particular formats for processing by a computer. Atthe most basic level, an image file contains bitmap information, which is thecolor information for each dot in each column and row of an image. Thevarious file formats (TIFF, BMP, etc.) use different methods of storing andrecalling this information.MagnificationAn expression of the relationship between the scanning resolution and theoutput resolution stated as a percentage. If the output resolution is set to 720dpi and the scanning resolution to 360 dpi, then the magnification rate is 50%.MoiréThe patterns or lines created by overlapping dots in an image. Thisphenomenon is found when photographs or pictures are scanned from booksand magazines at low resolutions. The Descreen function helps to eliminatemoiré patterns.Optical ResolutionAn expression of the volume of data per inch (dpi) that can be sampled by ascanner. |
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