ROI Descriptor is a descriptor indicating the regions in the image whose color information you want to compare with the information in Color Spectrum. All region contours are considered to be external. If ROI Descriptor contains multiple regions, the color information in each region is compared with Color Spectrum individually and the match results are reported for each region. If ROI Descriptor is not connected, the VI considers the entire image as a single region.

	Global Rectangle contains the coordinates of the bounding rectangle.
	Contours are each of the individual shapes that define an ROI. ID refers to whether the contour is the external or internal edge of an ROI. Type is the shape type of the contour. Coordinates indicates the relative position of the contour.

Image is a reference to the color image from which you want to extract the color feature to compare with the color defined by the input Color Spectrum color feature array.

Color Spectrum contains information about the color to match. During the matching phase, the color information in each specified image region is compared with the information contained in this array.

Tip  You can ignore certain color components by replacing the corresponding component in Color Spectrum to –1. For example, by replacing the last component in Color Spectrum with –1, the white color is ignored during the color matching process. By replacing the second to last component in Color Spectrum, the black color is ignored during the color matching process.

Minimum Match Score is the smallest score a match can have to be considered valid. The data range for a match is between 0 and 1000.

error in (no error) describes the error status before this VI or function runs. The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.

	status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.
	code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
	source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.

Match Saturation Threshold specifies the threshold value to distinguish two colors with the same hue value. The default is 80. The value used here should be the same as that used in the IMAQ ColorLearn VI.

Match Flag is an array containing Boolean information that indicates whether there is a match between the input color information and the color in each specified region in the image. For each specified region in the image, the match flag is set to TRUE if its color information matches the input color information (for example, if Match Score is higher or equal to Minimum Match Score).

Match Score is an array containing the match scores for each region in the image. The match scores are represented on a scale of 0 to 1000 where 0 indicates no match and 1000 indicates a perfect match.

error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces. Right-click the error out indicator on the front panel and select Explain Error from the shortcut menu for more information about the error.

	status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.
	code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
	source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.