The statistics can be the estimated stats by the function itself, or the statistics can be estimated by the software if you chose a layer.Ĭheck the Use Gamma check box if you want to apply a gamma stretch. Use Auto Gamma to calculate gamma from the statistics and histogram of the dataset. By default, the statistics are retrieved from the data however, any values you enter in this parameter will be used instead. You can enter your own statistics on the dialog box. This option is generally applied when the image will be published and used in a web app that cannot perform this type of stretch. If the stretch requires a histogram that doesn't exist, it will be estimated.Ĭheck the Dynamic Range Adjustment check box if you want the statistics calculated from only the pixels displayed on your screen. If this is checked and the raster has statistics, or you've entered values in the Statistics table, they will be used instead of estimating, unless the stretch requires a histogram. The estimated statistics are calculated from a 1000 by 1000 sampling from the center of the raster and used by the stretch. A high value such as 6 will use the entire curve, which tends to produce bold and sharp colors.Ĭheck the Estimate Statistics check box if you want to estimate your statistics. 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. Specify the percentage of the high values to exclude from the stretch. Specify the percentage of the low values to exclude from the stretch.
Mean value it is best when used on normally distributed data. Method is used to emphasize how much feature values vary from the The n value for the number of standard deviations to use. Set the highest pixel value for the histogram. The Output Minimum and Output Maximum will set the range of values that will then be linearly contrast stretched. Set the lowest pixel value for the histogram. Different stretches will produce different results in the raster display. For example, an 8-bit raster dataset or mosaic dataset will be stretched from 0 to 255. Stretching improves the appearance of the data by spreading the pixel values along a histogram from the minimum and maximum values defined by their bit depth. The stretch type defines a histogram stretch that will be applied to the rasters to enhance their appearance. Range, you can alter and visually enhance the appearance of the Stretching the values (shown in histogram B) across the entire The following images show an example of a stretch. Make sure statistics have been calculated. The mosaic dataset therefore, if you use this function, you must The Stretch function uses the statistics from the rasters within Such as brightness, contrast, and gamma through multiple stretch The Stretch function enhances an image by changing properties
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