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Get Color Pixel Line (G Dataflow)

Last Modified: June 25, 2019

Extract a line of pixels from a color image.

This node returns an array of either unsigned 32-bit integers or clusters of four unsigned 16-bit integers, depending on the bit depth of Image. You can convert an array of 32-bit integers into an array of clusters coding the three color values as either (R, G, B), (H, S, L), (H, S, V), or (H, S, I) using the Integer To Color Value.gvi node.

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image in

Reference to the source image.

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line coordinates

Numeric array that specifies the start x, start y, end x, and end y coordinates of the two end points of the line to extract.

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Note

A line designated by the coordinates [0, 0, 0, 255] consists of 256 pixels. The output Pixels Line contains the values specified by this line. Any pixel values outside the image automatically are set to 0 in Pixels Line.

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error in

Error conditions that occur before this node runs.

The node responds to this input according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Default: No error

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image out

Reference to the source image.

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U32 pixel values

Numeric indicator that returns the pixel values as a 1D array of unsigned 32-bit integer indicators.

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U64 pixel values

Numeric indicator that returns the pixel values as clusters of four unsigned 16-bit integers.

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Plane 1 (Red)

Value of the red plane.

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Plane 2 (Green)

Value of the green plane.

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Plane 3 (Blue)

Value of the blue plane.

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Plane 4 (alpha)

Value of the alpha plane.

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error out

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported

Web Server: Not supported in VIs that run in a web application


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