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Stretch Histogram


Stretch Histogram


Allows to optimize contrast by selecting a lower and upper threshold value of pixel intensity.

Dialog box

The dialog box displays a histogram of pixel intensities. The upper and lower threshold values are represented by vertical red lines.

Histogram dialog

You drag the red lines to the required threshold values.

  • pixels with a pixel intensity less than the lower threshold value will be black.
  • pixels with a pixel intensity higher than the upper threshold value will be white.
  • the pixel intensity between the two threshold values will be stretched over the full range of possible pixel intensities.

Click Preview to judge the results.

Click OK to proceed.


Before: After:
Orignal image Image with stretch histogram applied

See also