Table Of Contents

Merge Overlay (G Dataflow)

Last Modified: October 24, 2017

Makes a nondestructive overlay part of the image content.

This process creates a destructive overlay. The node then removes the nondestructive overlay. The resulting image is an RGB image.

connector_pane_image
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image src

Reference to the source image.

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image dst

Reference to the destination image.

If connected, image dst is converted to an RGB image. If not connected, image src is converted to an RGB image.

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group names

Array of strings consisting of the overlay group names to merge to the image.

If no names are specified, all available groups are merged.

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color palette

Option that applies a color palette to the image.

Color Palette is an array of clusters constructed by the user or supplied by the Get Color Palette.gvi node. This palette can be composed of up to 256 elements for each of the three color planes (red, green, and blue). If the array has less than 256 elements, the node maps all pixel values past the last element in the array to the associated grayscale value.

A specific color is the result of applying a value between 0 and 255 for each of the three color planes. If the three planes have identical values, a gray level is obtained (0 specifies black, and 255 specifies white). The default is a grayscale palette. The color palette can be used only for 8-bit images.

For best results, set your video adapter to high color or true color.

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Red

Value of the red color plane.

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Green

Value of the green color plane.

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Blue

Value of the blue color plane.

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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 dst out

Reference to the destination image.

If image dst is connected, image dst out is the same as image dst. Otherwise, image dst out refers to the image referenced by image.

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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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