Adaptive Threshold uses an adaptive threshold to dynamically reduce the number of colors on an image.
As you move the sliders you will see the image changing in the Preview Window. We recommend you position the sliders as follows:
You may notice that areas of solid color such as arrowheads or thick lines become hollow.
If text characters start to “bleed” so that white spaces within them or between them become filled, move the Window slider back to the left a little.
Adjust the Window and Background values if necessary.
The Restore button resets the Window and Background values to the values they were set at when you entered the dialog.
Click to undo.
Once you have thresholded the image you may want to …
This is because thresholding reduces the number of colors on the image to black and white, but it does not reduce the image’s color depth to two colors (see Reducing colors vs reducing color depth).
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