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Image channel node

Converts rows and/or columns of pixels in an image to CHOP channels.

This CHOP converts rows and/or columns of pixels in an image to CHOP channels. It generates one CHOP channel per span of pixels in the image. Pixels, rows, columns or rectangular regions can be extracted from the image.

There is an optional input which supplies UV coordinates to sample the image. The input CHOP must contain two channels, one for U and one for V. The first channel is always assumed to be U. The channels produced (red, green, blue and alpha) will be exactly as long as the input channel’s length, with a value for each UV coordinate.

Parameters

Image

Source

Specify the COP Network, and the COP here as the source from which the image should be obtained.

Frame

The frame number from which to obtain the image.

Red, Green, Blue, Alpha

Creates a CHOP channel per scanline with the prefix specified here, starting at 0. For example, the default is “r” in the Red field. If the specified COP is a horizontal ramp that is 5 lines high, it creates five CHOP channels (r0 - r4) using the values of the red pixels in those scanlines.

RGBA Units

Scales the output to lie in the range 0-1, 0-255 or 0-65535.

Crop

Crop

Pixel (U.V)

Extracts a single pixel from the image.

Row (U)

Extracts a single row from the image. The V Start indicates the row to select, and the U Start and U End indicate the range to extract.

Column (V)

Extracts a single column from the image. The U Start indicates the column to select, and the V Start and V End indicate the range to extract.

Rows and Columns

Extracts an area from the image.

Full Image

Extracts the full image.

UV Units

Specifies the units for the following 4 parameters.

U Start

Starting point for sampling in U. Values outside the range of the image are determined by the image’s extend conditions, in the extend page.

U End

Ending point for sampling in U.

V Start

Starting point for sampling in V.

V End

Ending point for sampling in V.

Interpolate

Determines the interpolation method when UV sampling with an input CHOP is used.

Extend

Image Left

The image extend conditions when sampling the image with U less than 0.

Image Right

The image extend conditions for U greater than 1.

Image Bottom

The image extend conditions for V less than 0.

Image Top

The image extend conditions for V greater than 1. The extend conditions are:

Hold

Use the first or last pixel value.

Cycle

Loop back to the other side of the image.

Mirror

Zig-zap back into the image.

Default Color

Use a default color specified below.

Default Color

The color to use when outside the bounds of the image, and the Default Color extend condition is set.