Operators Dialog / Operator Details

10.4.26 - Force Dynamic

This will change the contrast of the selected area in such a way as to push the minimum and maximum measured levels to the minimum and maximum possible levels. You can use the sample tool directly or with the eyedropper to sample the area first, and then adjust a different area with this tool, or you can have the operator do the sampling directly.

The force dynamic operator

Force dynamic is a very interesting and useful operator. It is well worth the time it takes to get familiar with it. What it does is, based upon the contrast range in the sampled area (which can be the selected area, or an area you sampled previously), it adjusts the contrast so that the maximum possible dynamic range — that is, the brightest to the darkest possible values without damaging the color balance of the sampled area — is used by the selected region.

Forced dynamic can be used to bring up faint details in a controlled manner, to enhance astrophotos, radiological images, and increase clothing transparency in fashion and glamour shots.

See Also: Floor, Ceiling

One watt LED bulb, normal image

I've taken this image, un-checked  Take Sample From Area in the Forced dynamic operator, selected the Rectangle tool, clicked the Eyedropper tool, and pulled the rectangle around the barely visible structure at the center of the bulb. Once the sample is taken, the Operators dialog returns to the Forced dynamic operator. Then I selected the Entire image area tool, and clicked on the image; the result you can see below.

So what happened here is that the sample tool measured the maximum and minimum levels in the selected area (the rectangle) and then Force dynamic operator pushed the entire image so that those levels reached the maximum dynamic range possible, and in so doing, the inner structure of the LED bulb, previously of such low contrast as to be almost invisible, is revealed.

One watt LED bulb, forced image
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