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MultiCam Boards Documentation > MultiCam Documentation > MultiCam User Guide > The Channel Class > Understanding Grabber Specification > How to Control the Analog Offset on Domino Boards? > Offset Adjustment

Offset Adjustment

The offset is applied after the gain. This means that as a first step the gain control establishes a digitizing span, then as a second step the offset control moves this span over the clamped video signal.

The offset is adjusted through the Offset parameter, the value of which should be in a range depending of the hardware.

Increasing the offset value results into a brighter image, and reversely, decreasing the offset value results into a darker image.

An offset adjustment of 500 results in a digitizing span shift, which amounts to 50 % of the full digitizing span.

Once the common offset is chosen, it is still possible to trim an individual tap through the OffsetTrim<1,2,3> parameter.

The control resolution for OffsetTrim<1,2,3> is not specified. Each unit increment or decrement corresponds to the minimal amount of offset alteration the board hardware is supporting.

Setting the OffsetTrim<1,2,3> parameter to a positive value increases the offset for the relevant camera tap above the value established by the Offset common parameter. The correction induced by OffsetTrim<1,2,3> is simply added to the common Offset.

Setting the OffsetTrim<1,2,3> parameter to a negative value decreases the offset for the relevant camera tap below the value established by the Offset common parameter.

The minimal and maximal values for OffsetTrim<1,2,3> depend on the value assigned to Offset.