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Canon 4.1 User Manual
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52S T E P 3Adjusting the Threshold ValueWhen the scan mode is set to black and white, the image brightness can beadjusted. The threshold value setting determines whether a halftone will beexpressed as a black or a white data point. The possible threshold values rangebetween 0 and 255. Below a given threshold value, all data is converted to black.Likewise, all data with a value above the threshold is converted to white.Accordingly, higher threshold values produce darker images while lower thresholdvalues result in brighter images.To Set the Threshold ValueWhen the scan mode is set to black and white, click the [ToneAdjustment] button or pull down the Image menu and select [ToneAdjustment].Threshold Value = 128 (Standard) Threshold Value = 70Threshold Value = 180Click the [OK] button.The preview image will change to reflect the new settings.Drag the slidebar left or right to adjust thethreshold setting.After adjusting the threshold value, you cansave the setting to a file under a file name andload the file again whenever you want to usethe setting.Click the up or down arrow to increase ordecrease the entry in the text box, or enter thevalue (0~255) directly from the keyboard.To restore the threshold setting to its default value, click this button. |
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