Canon printer PIXMA MG2920 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 • Highlights may be lost if you brighten the image too much, and shadows may be lost if you darken the image too much. Contrast "Contrast" is the degree of difference between the brighter and darker parts of an image. Increasing contrast will increase the difference, thus sharpening the image. Decreasing contrast will decrease the difference, thus softening the image. Move (Slider) under Contrast to the left to decrease and right to increase the contrast of the image. You can also enter a value (-127 to 127). Decreased contrastOriginal imageIncreased contrast Note • Increasing the contrast is effective in adding a three-dimensional feel to soft images. However, shadows and highlights may be lost if you increase the contrast too much. 501
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 • Click Defaults to reset all adjustments in the current window. Channel Each dot of an image is a mixture of Red, Green, and Blue in various proportions (gradation). These colors can be adjusted individually as a "channel." Master Adjust the Red, Green, and Blue combined. Red Adjust the Red channel. Green Adjust the Green channel. Blue Adjust the Blue channel. Note • Only Grayscale will be displayed in Channel when Color Mode is Grayscale . Reading Histograms You can see the histogram of a specified area for each Channel. The higher the histogram peak, the more data is distributed to that level. 502
(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. • All parts to the left of (Black-point Slider) will be black (level 0). • The parts at (Mid-point Slider) will turn to the color exactly between the black-point and white- point. • All parts to the right of (White-point Slider) will turn white (level 255). When Image Adjustment is set to anything but None, the adjustments shown below are performed automatically. Moving the Black-point and White-point SlidersMove the Black-point Slider or White-point Slider to adjust brightness. Images with more data distributed to the highlight side Move the Black-point Slider toward the highlight side. Images with more data distributed to the shadow side Move the White-point Slider toward the shadow side. Images with widely distributed data Move the Black-point Slider toward the highlight side, and White-point Slider toward the shadow side. 503
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. • The point clicked with (Black-point Dropper) will be the darkest point. You can also enter a value (0 to 245). • The point clicked with (Mid-point Dropper) will be the middle of the tonal range. You can also enter a value (5 to 250). 504
•The point clicked with (White-point Dropper) will be the brightest point. You can also enter a value (10 to 255).• Click (Dropper) for Gray Balance and click the area you want to adjust the color in the preview image. The clicked point will be set as the achromatic color reference, and the rest of the image is adjusted accordingly. For instance, if snow in a photo appears bluish, click the bluish part to adjust the whole image and reproduce natural colors. 505
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 • Click Defaults to reset all adjustments in the current window. Channel Each dot of an image is a mixture of Red, Green, and Blue in various proportions (gradation). These colors can be adjusted individually as a "channel." Master Adjust the Red, Green, and Blue combined. Red Adjust the Red channel. Green Adjust the Green channel. Blue Adjust the Blue channel. Note • Only Grayscale will be displayed in Channel when Color Mode is Grayscale . Reading Tone Curves With ScanGear, scanning images via a scanner is the input, and displaying to a monitor is the output. "Tone Curve" shows the balance of tone input and output for each Channel. 506
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. 507
Edit custom curve You can drag specific points on the Tone Curve to freely adjust the brightness of the corresponding areas. 508
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 • This function is available when Color Mode is Black and White . • Click Defaults to reset all adjustments in the current window. Adjusting Threshold The brightness of color and grayscale images is expressed in a value between 0 and 255. However, in creating black and white images, all colors are mapped to either black (0) or white (255). "Threshold" is the borderline value that determines a color as black or white. Move (Slider) to the right to increase the threshold value and thus increase the black areas. Move the slider to the left to decrease the value and thus increase the white areas. You can also enter a value (0 to 255). 509
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 510