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ntsc2rgb

Convert NTSC values to RGB color space

Syntax

rgbmap = ntsc2rgb(yiqmap)
RGB = ntsc2rgb(YIQ)

Description

rgbmap = ntsc2rgb(yiqmap) converts the m-by-3 NTSC (television) color values in yiqmap to RGB color space. If yiqmap is m-by-3 and contains the NTSC luminance (Y) and chrominance (I and Q) color components as columns, then rgbmap is an m-by-3 matrix that contains the red, green, and blue values equivalent to those colors. Both rgbmap and yiqmap contain intensities in the range 0 to 1.0. The intensity 0 corresponds to the absence of the component, while the intensity 1.0 corresponds to full saturation of the component.

RGB = ntsc2rgb(YIQ) converts the NTSC image YIQ to the equivalent truecolor image RGB.

ntsc2rgb computes the RGB values from the NTSC components using

[RGB]=[1.000  0.956  0.6211.0000.2720.6471.0001.106  1.703][YIQ].

Class Support

The input image or colormap must be of class double. The output is of class double.

Examples

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This example shows how to convert an image from RGB to NTSC color space and back.

Read an RGB image into the workspace.

RGB = imread('board.tif');

Convert the image to YIQ color space.

YIQ = rgb2ntsc(RGB);

Display the NTSC luminance, represented by the first color channel in the YIQ image.

imshow(YIQ(:,:,1))
title('Luminance in YIQ Color Space')

Convert the YIQ image back to RGB color space.

RGB2 = ntsc2rgb(YIQ);

Display the image that was converted from YIQ to RGB color space.

figure
imshow(RGB2)
title('Image Converted from YIQ to RGB Color Space')

Introduced before R2006a

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