ImagePreviewFunction

is an option for CurrentImage and similar functions that specifies the function to apply to images before being displayed.

Details

Original images are stored in the buffer, and the function specified using ImagePreviewFunction is only applied to them before being displayed.
Use ImageCaptureFunction to process images before storing in the buffer.
Typical settings include:
Identity no processing

f an arbitrary function f

Examples

By default, the original captured image is displayed in the capture user interface:

Wolfram Language code: CurrentImage[]

Apply a function to the images before displaying:

Wolfram Language code: CurrentImage[ImagePreviewFunction -> ColorNegate]

Notice the values stored in the buffer are still the original captured frames:

Wolfram Language code: CurrentImage[3]

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	Identity	no processing
	f	an arbitrary function f