Hotspot

This transformation compensates for the central bright spot that often occurs in IR (infrared) photography, especially with wide angle lenses, by darkening a circular area in the center of the image.

An overlay is displayed on the input image to show you the location and diameter of the hot spot. While initially located in the center of the image, you can move the hot spot to a different location by dragging the control point in the center of the circle.

Radius

The radius slider lets you select the size of the region to be darkened. As you vary the radius, the circle displayed over the input image changes size to show you what part of the input image will be affected. The radius is specified as a percentage of the longest dimension of the image.

Strength

The strength slider lets you select the amount of darkening applied to the central region. The lower the value you select, the less the center will be darkened.

Tips

The size and intensity of the hot spot often depends on the lens you are using as well as the f stop and focal length if it is a zoom lens. For this reason, you usually need to make individual adjustments on each image taken with a different lens or settings.