Canon Pixma Mp550 User Guide
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Advanced Guide > Scanning > Scanning with Other Application Software > Correcting Images and Adjusting Colors with ScanGear (Scanner Driver) > Adjusting Brightness and Contrast Adjusting Brightness and Contrast In ScanGears Advanced Mode tab, click (Brightness/Contrast). Note Click (Down arrow) to switch to detailed view. Click (Up arrow) to return to the previous view. Click Defaults to reset all adjustments in the current wi ndow. 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. Page 611 of 877 pages Adjusting Brightness and Contrast JownloadedtfromtManualsPrinterFcomtManuals
Note Only Grayscale will be displayed in Channel when Color Mode is Grayscale. 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 an d 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 th ree-dimensional feel to soft images. However, shadows and highlights may be lost if you increase the con trast too much. Page top Page 612 of 877 pages Adjusting Brightness and Contrast JownloadedtfromtManualsPrinterFcomtManuals
Advanced Guide > Scanning > Scanning with Other Application Software > Correcting Images and Adjusting Colors with ScanGear (Scanner Driver) > Adjusting Histogram Adjusting Histogram In ScanGears Advanced Mode tab, click (Histogram). Note Click Defaults to reset all adjustments in the current wi ndow. 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 Co lor Mode is Grayscale. Reading Histograms You can open Histogram of a specified area for each Channel. The higher the Histogram peak, the more data is distributed to that level. Page 613 of 877 pages Adjusting Histogram JownloadedtfromtManualsPrinterFcomtManuals
(1) Bright area(2) Dark area(3) W hole image More data is distributed to the highlight side. More data is distributed to the shadow side.Data is widely distributed between the highlight and shadow. Adjusting Histograms (Using the Slider) Select a Channel, then move (Black-point Slider) or (W hite-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 (W hite-point Slider) will turn white (level 255). Image Adjustment is Auto by default. Adjustments sh own below are automatically performed. Moving the Black-point and White-point Sliders Move the Black-point Slider or W hite-point Slider t o adjust brightness. Images with more data distributed to the highlight side Move the Black-point Slider toward the highlight si de. Images with more data distributed to the shadow sid e Move the W hite-point Slider toward the shadow side. Images with widely distributed data Move the Black-point Slider toward the highlight si de, and W hite-point Slider toward the shadow side. Page 614 of 877 pages Adjusting Histogram JownloadedtfromtManualsPrinterFcomtManuals
Moving the Mid-point Slider Move 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 sid e Move the Mid-point Slider toward the shadow side. Adjusting Histograms (Using the Droppers) W hen you select a Channel and click the Black-point , Mid-point or W hite-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. Y ou can also enter a value (0 to 245). - The point clicked with (Mid-point Dropper) will be the middle of the tona l range. You can also enter a value (5 to 250). - The point clicked with (W hite-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 appea rs bluish, click the bluish part to adjust the whole image and reproduce natural colors. Page top Page 615 of 877 pages Adjusting Histogram JownloadedtfromtManualsPrinterFcomtManuals
Advanced Guide > Scanning > Scanning with Other Application Software > Correcting Images and Adjusting Colors with ScanGear (Scanner Driver) > Adjusting Tone Curve Adjusting Tone Curve In ScanGears Advanced Mode tab, click (Tone Curve Settings). Note Click Defaults to reset all adjustments in the current wi ndow. 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 Co lor Mode is Grayscale. Reading Tone Curves W ith ScanGear (scanner driver), scanning images via a scanner is the input, and displaying to a monitor is the output. Tone Curve shows the balance of to ne input and output for each Channel. Page 616 of 877 pages Adjusting Tone Curve JownloadedtfromtManualsPrinterFcomtManuals
Adjusting Tone Curve In Select Tone Curve, select a tone curve from No correction, Overexposure, Underexposure, High contrast, Reverse the negative/positive image and E dit custom curve. No correction (No adjustment) Overexposure (Convex curve) The midtone data of the input side is stretched tow ard 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 tow ard 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 enhance d, resulting in a high-contrast image. Reverse the negative/positive image (Downward-slopi ng line) The input and output sides are reversed, resulting in a negative-positive inverted image. Page 617 of 877 pages Adjusting Tone Curve JownloadedtfromtManualsPrinterFcomtManuals
Edit custom curve You can drag specific points on the Tone Curve to freely adjust the brightness of the corresponding areas. Page top Page 618 of 877 pages Adjusting Tone Curve JownloadedtfromtManualsPrinterFcomtManuals
Advanced Guide > Scanning > Scanning with Other Application Software > Correcting Images and Adjusting Colors with ScanGear (Scanner Driver) > Setting Threshold Setting Threshold The brightness of color and grayscale images is exp ressed in a value between 0 and 255. However, in creating black and white images, all colors are mapped t o either black (0) or white (255). Threshold is the borderline value that determines a color as bla ck or white. By adjusting the threshold level, you can sharpen text in a document or reduce show-through in ne wspapers. This function is available when Color Mode is Black and W hite. In ScanGears Advanced Mode tab, click (Threshold). Note Click Defaults to reset all adjustments in the current wi ndow. Adjusting Threshold 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 i ncrease the white areas. You can also enter a value (0 to 255). Page top Page 619 of 877 pages Setting Threshold JownloadedtfromtManualsPrinterFcomtManuals
Advanced Guide > Scanning > Scanning with Other Application Software > ScanGear (Scanner Driver) Screens ScanGear (Scanner Driver) Screens The following sections describe ScanGears screens and functions, and how to use ScanGear (scanner driver). Basic Mode Tab Advanced Mode Tab Input Settings Output Settings Image Settings Color Adjustment Buttons Auto Scan Mode Tab Preferences Dialog Box Scanner Tab Preview Tab Scan Tab Color Settings Tab Page top Page 620 of 877 pages ScanGear (Scanner Driver) Screens JownloadedtfromtManualsPrinterFcomtManuals