Canon CanoScan FB 1200S User Manual - Page 52

Brightness Settings for Black & White Images (Threshold Value), To Set the Threshold Value

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STEP 4 Brightness Settings for Black & White Images (Threshold Value) When the scan mode is set to black and white, the image brightness can be adjusted. The threshold value setting determines whether a halftone will be expressed as a black or a white data point. The possible threshold values range between 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 threshold values result in brighter images. Threshold Value = 128 (Standard) Threshold Value = 180 Threshold Value = 70 To Set the Threshold Value When the scan mode is set to black and white, click the [Tone adjustment] button or pull down the Image menu and select [Tone adjustment]. Drag the slidebar left or right to adjust the threshold setting. Click the up or down arrow to increase or decrease the entry in the text box, or enter the value (0~255) directly from the keyboard. After adjusting the threshold value, you can save the setting to a file under a file name and load the file again whenever you want to use the setting. To restore the threshold setting to its default value, click this [Reset] button. Hint The changes will be reflected in the preview image. 52 52

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When the scan mode is set to black and white, the image brightness can be adjusted.
The threshold value setting determines whether a halftone will be expressed as a black or
a white data point. The possible threshold values range between 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 threshold values result in brighter images.
To Set the Threshold Value
When the scan mode is set to black and white, click the [Tone adjustment]
button or pull down the Image menu and select [Tone adjustment].
Hint
The changes will be reflected in the preview image.
Brightness Settings for Black & White Images (Threshold Value)
Threshold Value = 128 (Standard)
Threshold Value = 70
Threshold Value = 180
S T E P
4
Drag the slidebar left or right to adjust the
threshold setting.
After adjusting the threshold value, you can
save the setting to a file under a file name and
load the file again whenever you want to use
the setting.
Click the up or down arrow to increase or
decrease the entry in the text box, or enter the
value (0~255) directly from the keyboard.
To restore the threshold setting to its default value, click this [Reset] button.