To adjust brightness, color and tint 
PaperPort makes it easy to quickly improve the quality of an image by adjusting its sharpness, brightness, contrast, color, or tint.
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Display the image item in the Image View window and click the Page tab.
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Choose
Sharpen or click the arrow next to Enhance and choose from options
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Brightness & Contrast,
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Color,
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Tint.
For Sharpen, use a slider to blur or sharpen the image. For the three Enhance options, the Enhance Image dialog box displays the original image and eight different samples or variations of that image .
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In the Enhance Image dialog box, select Brightness & Contrast, Color, or Tint.
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Drag the slider to adjust the selected attribute. Notice that the eight images update relative to the current image.
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When you see the image you like best, double-click it. The image moves to the center pane and is displayed as the current image. If you do not like changes, click Undo or Reset.
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Click OK.
Tip
To ensure that your original image is unchanged, it is a good idea to make a backup copy of the image before you make adjustments.