Changing Intensity

How can I manually change image intensity on this version? I’m using an iMac.

Operating system: Mac
Slicer version:4.11

If you mean adjusting window/level for better contrast, you can do that through the window/level tool of the mouse modes. See more information at

Otherwise you can see a number of filters in SimpleFilters (rescale intensity, intensity windowing) filters to modify the intensity distribution of your image.

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Thank you! It was really helpful.