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| Understanding Scanners/Image quality | Index | Home |
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Overall appearance of the scanned image is too dark |
Image with a dark cast |
When the imported image lacks overall brightness, it appears dark. This may be caused by the poor quality of paper used to display the original image or improper exposure during scanning. |
When a scanner is attached to a Macintosh but the image is viewed with a DOS-compatible monitor, the image frequently appears darker due to the difference in the two device's gamma value (tone adjustment). |
In order to brighten the imported image, use image editing software and make the necessary adjustment without disturbing the color balance. |
When the brightness is raised, its overall brightness is increased, which means its dark areas will also be made brighter. This tends to dilute the overall color of the image. To prevent this, use Photoshop to accent the tones of the highlighted and intermediate parts with the Levels dialog box or the curves dialog box. To open these boxes, select Adjust from the Image menu. |
To change the gamma value, move the triangles under the graph in the Levels dialog box. |
Correcting the level of darkness with image editing software |
Correcting the tone curve with image editing software |
Another way of coping with this problem is to use a greater amount of exposure. Note that overexposure causes increased contrast. |
The adjustments brighten the image |
Compare:Understanding Scanners/The scanned image is too bright |
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