Specifies attributes of non-rectangular ROI associated with an image.
| IG_CONTROL_NR_ROI_DIB | The value specified is a DIB to be used as a mask HIGEAR for the image. |
| IG_CONTROL_NR_ROI_REFERENCE_POINT | The value specified is a position within the HIGEAR image at which the upper-left corner of the masking HIGEAR should be placed. |
| IG_CONTROL_NR_ROI_CONDITION | The value specified indicates whether or not ImageGear should override the AT_RECT argument passed to its API. If TRUE then NRA ROI is used, otherwise the rectangular ROI is in effect. |
| IG_CONTROL_NR_ROI_REFERENCE_POINT_LEFT | The parameter specified is a mask reference point x component. |
| IG_CONTROL_NR_ROI_REFERENCE_POINT_TOP | The parameter specified is a mask reference point y component. |
| IG_CONTROL_NR_ROI_VALIDATE | The value returned specifies whether there is a valid mask associated with image. |
See IG_IP_NR_ROI_control_set description for more information.