Canon printer PIXMA MG6821 User Manual
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Brightness Adjust the image brightness. Move (Slider) under Brightness to the left to darken and right to brighten the image. You can also enter a value (-127 to 127). DarkenedOriginal imageBrightened Note
Adjusting HistogramYou can adjust the image color tone by using a graph (histogram) showing brightness distribution, via (Histogram) in ScanGear (scanner driver)'s Advanced Mode tab. Note
(1) Bright area(2) Dark area(3) Whole imageMore data is distributed to thehighlight side.More data is distributed to the shadow side.Data is widely distributed between thehighlight and shadow. Adjusting Histograms (Using the Slider) Select a Channel , then move (Black-point Slider) or (White-point Slider) to specify the level to be set as the shadow or highlight.
Moving the Mid-point SliderMove the Mid-point Slider to specify the level to be set as the middle of the tonal range. Images with more data distributed to the highlight side Move the Mid-point Slider toward the highlight side. Images with more data distributed to the shadow side Move the Mid-point Slider toward the shadow side. Adjusting Histograms (Using the Droppers) When you select a Channel and click the Black-point, Mid-point, or White-point Dropper, the mouse pointer on the preview image changes to a dropper. Click a Dropper displayed below the histogram to change the setting.
Adjusting Tone CurveYou can adjust the brightness of an image by selecting the type of graph (tone curve) showing the balance of tone input and output, via (Tone Curve Settings) in ScanGear (scanner driver)'s Advanced Mode tab. Note
Adjusting Tone Curve In Select Tone Curve , select a tone curve from No correction, Overexposure , Underexposure , High contrast , Reverse the negative/positive image , and Edit custom curve . No correction (No adjustment) Overexposure (Convex curve) The midtone data of the input side is stretched toward the highlight of the output side, resulting in a bright- toned image when viewed on a monitor. Underexposure (Concave curve) The midtone data of the input side is stretched toward the shadow of the output side, resulting in a dark- toned image when viewed on a monitor. High contrast (S curve) The highlight and shadow of the input side are enhanced, resulting in a high-contrast image. Reverse the negative/positive image (Downward-sloping line) The input and output sides are reversed, resulting in a negative-positive inverted image. 737
Edit custom curve You can drag specific points on the Tone Curve to freely adjust the brightness of the corresponding areas. 738
Setting ThresholdYou can sharpen text in a document or reduce show-through in newspapers by adjusting the threshold level via (Threshold) in ScanGear (scanner driver)'s Advanced Mode tab. Note
ScanGear (Scanner Driver) Screens Basic Mode Tab Advanced Mode Tab Input Settings Output Settings Image Settings Color Adjustment Buttons Preferences Dialog Box Scanner Tab Preview Tab Scan Tab Color Settings Tab 740