A high value such as 6 will use the entire curve, which tends to produce bold and sharp colors. A low value such as 1 will only use the middle portion of the curve, which tends to produce dull and faint colors. The Strength Level determines how much of the sigmoidal function will be used in the stretch. This is an ideal stretch for almost any image and performs very well when there are clouds and water in the image. The result of this is less contrast in very bright and very dark areas, and more contrast in areas between these extremes. It places all of the pixel values along a sigmoidal function (an S-shaped curve). The Sigmoid contrast stretch is designed to highlight moderate pixel values in your imagery while maintaining sufficient contrast at the extremes. This method is used to provide a good overall stretch to imagery. ![]() ![]() It uses an S curve to find a mean and helps to prevent pixel values to be stretched to the extremes. The statistics and histogram are analyzed and a modified sigmoid stretch is applied. Valid values for the minimum and maximum are 0 to 100. You need to specify the minimum and maximum percentage values to exclude from the stretch. The minimum and maximum values of the calculated statistics will be used as the minimum and maximum values of the color ramp all values in between will be interpolated linearly.Īllows you to load an XML file containing a customized histogram.Ī stretch is applied without using the high and low extreme percent values. This method is appropriate when there are a lot of pixel values that are closely grouped together. This method is used to emphasize how much feature values vary from the mean value it is best when used on normally distributed data.Ī histogram equalization contrast stretch will be applied. You can also specify the n value for the number of standard deviations to use. Move them to the required location to stretch particular values.Ī standard deviation stretch will be applied. Add breakpoints to the graph line by clicking inside the histogram. The pixel values will be mapped from the possible minimum and maximum values of the data type and depth stored in the raster to the beginning and end of the color ramp.Ī customized histogram stretch can be specified by clicking the Histogram button.
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