Indexed and RGB
Sophisticated tool to do image enhancing manipulations in either indexed or RGB (true color) images.
- Adjust the contrast and brightness of the displayed image by manipulating the window over the histogram in the Adjust Contrast tool. The tool provides several ways that you can modify the size and position of the window interactively:
- By grabbing one of the vertical sides of edges of the window and dragging it. You can also change the position of the window by grabbing the center line and dragging the window to the right or left.
- By specifying the size and position of the window in the Minimum and Maximum fields. You can also define these values by clicking the dropper button associated with these fields. Position this cursor over the pixel in the image that you want to be the minimum (or maximum) value and click the mouse button.
- By specifying the size and position of the window in the Width and Center fields.
- By automatically scaling the display range to match the image data range. For example, with the pout.tif image, if you select the Match data range option, the window changes from the default display range (0 to 255) to the data range of the image (74 to 224).
- By automatically trimming outliers at the top and bottom of the image data range. If you select the Eliminate outliers option, the Adjust Contrast tool removes the top 1% and the bottom 1%, but you can specify other percentages. When you specify a percentage, the Adjust Contrast tool applies half the percentage to the top and half to the bottom.
To see what the effect of changes made using one the possibilities above hit the Contrast Stretch button. Another way to enhance the true-color composite is to use a decorrelation stretch, which enhances color separation across highly correlated channels. Use Decorrelation Stretch button to perform the decorrelation stretch. You can have a pretty good idea of what happened if you plot the Scatter Plot before and after the decorrelation stretch.
Copyright © <2010>, <Joaquim Luis>
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