Intel® Integrated Performance Primitives (Intel® IPP) Developer Guide and Reference

ID 790148
Date 3/22/2024
Public
Document Table of Contents

GrayToRGB

Coverts a gray scale image to RGB/BGR by copying luminance component to color components.

Syntax

IppStatus ippiGrayToRGB_<mod>(const Ipp<datatype>* pSrc, int srcStep, Ipp<datatype>* pDst, int dstStep, IppiSize roiSize);

Supported values for mod:

8u_C1C3R 16u_C1C3R 32f_C1C3R

IppStatus ippiGrayToRGB_<mod>(const Ipp<datatype>* pSrc, int srcStep, Ipp<datatype>* pDst, int dstStep, IppiSize roiSize, Ipp<datatype> aval);

Supported values for mod:

8u_C1C4R 16u_C1C4R 32f_C1C4R

Include Files

ippcc.h

Domain Dependencies

Headers: ippcore.h, ippvm.h, ipps.h, ippi.h

Libraries: ippcore.lib, ippvm.lib, ipps.lib, ippi.lib

Parameters

pSrc

Pointer to the source image ROI.

srcStep

Distance, in bytes, between the starting points of consecutive lines in the source image.

pDst

Pointer to the destination image ROI.

dstStep

Distance, in bytes, between the starting points of consecutive lines in the destination image.

roiSize

Size of the source and destination ROI, in pixels.

aval

Constant value to create the fourth channel.

Description

This function operates with ROI (see Regions of Interest in Intel IPP ).

This function converts a gray scale image to an RGB/BGR image by copying luminance component to color components.

Return Values

ippStsNoErr

Indicates no error. Any other value indicates an error.

ippStsNullPtrErr

Indicates an error when pSrc or pDst is NULL.

ippStsSizeErr

Indicates an error condition if roiSize has a field with a zero or negative value.

Example

The code example below demonstrates how to use the ippiGrayToRGB_8u_C1C4R function.

    const int WIDTH  = 2;
    const int HEIGHT = 1;

    Ipp8u pSrc[WIDTH * HEIGHT] = {
        113,113,
    };
    Ipp8u pDst[WIDTH * HEIGHT * 4];
    int srcStep = WIDTH, dstStep  = WIDTH * 4;
    IppiSize roiSize = {WIDTH, HEIGHT};
    IppStatus status = ippiGrayToRGB_8u_C1C4R(pSrc, srcStep, pDst, dstStep, roiSize, 0xFF);
    if ( status == ippStsNoErr) {
        printf("PASS:\n(%3d %3d %3d %3d), (%3d %3d %3d %3d)\n", pDst[0], pDst[1], pDst[2], pDst[3], pDst[4], pDst[5], pDst[6], pDst[7]);
    }
    else 
        printf("FAIL: status = %d\n", status);

Result:

PASS:
(113 113 113 255), (113 113 113 255)