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Canon 4.1 User Manual
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Contents
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66GlossaryAuto Tone CorrectionA function that uses brightness/contrast and gamma value settings toautomatically analyze and adjust images.Bits/Bit NumbersEach dot of a 1-bit image is assigned either black or white according to thethreshold brightness value, resulting in the image being reproduced in justthose two colors. Each dot of an 8-bit grayscale image can be assigned any oneof 256 tones of gray, ranging from pure white to black. Each dot of a 24-bitcolor image can be assigned any one of 16.7 million colors since each of itscolor channels (red, green and blue) can be expressed in 256 distinct color tones(8 bits).Black and WhiteAn image mode used to reproduce images in two tones only: black and white.The brightness level at which a dot is determined to be either black or white iscalled the threshold value, which can be adjusted. See Threshold Value.Black Eyedropper ToolTool used to the select the darkest portion of an image in the preview area.Used with the Histogram function to adjust image brightness. When this tool isclicked on the image, all areas that are darker are set to pure black.BrightnessThe intensity of light in a scanned image. Raising an image’s brightnessincreases its overall brilliance, while decreasing it makes it darker.Color BalanceThe function in that enables you to adjust the blend of colors in a color image.You can adjust the color balance by altering the blend of the red, green andblue color set or the cyan, magenta, yellow and black color set.Color ChannelAny one of the red, green or blue elements of a color image. Since color imagesare assigned 8 bits per pixel for each of the red, green and blue channels, eachpixel is assigned 24 bits of data. The master channel is the composite of thesethree channels. In the Histogram and Tone Curve image adjustment functions,each channel can be separately or collectively adjusted. |
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