Developer Reference

  • 2020
  • 07/15/2020
  • Public Content
Contents

ColorTwist32f

Applies a color twist matrix to an image with integer pixel values.

Syntax

Case 1: Not-in-place operation on pixel-order data
IppStatus ippiColorTwist32f_<mod>(const Ipp<datatype>*
pSrc
, int
srcStep
, Ipp<datatype>*
pDst
, int
dstStep
, IppiSize
roiSize
, const Ipp32f
twist
[3][4]
);
Supported values for
mod
:
8u_C3R
16u_C3R
16s_C3R
8u_AC4R
16u_AC4R
16s_AC4R
Case 2: Not-in-place operation on planar data
IppStatus ippiColorTwist32f_<mod>(const Ipp<datatype>*
pSrc
[3], int
srcStep
, Ipp<datatype>*
pDst
[3], int
dstStep
, IppiSize
roiSize
, const Ipp32f
twist
[3][4]
);
Supported values for
mod
:
8u_P3R
16u_P3R
16s_P3R
Case 3: In-place operation on pixel-order data
IppStatus ippiColorTwist32f_<mod>(Ipp<datatype>*
pSrcDst
, int
srcDstStep
, IppiSize
roiSize,
const Ipp32f
twist
[3][4]
);
Supported values for
mod
:
8u_C3IR
16u_C3IR
16s_C3IR
8u_AC4IR
16u_AC4IR
16s_AC4IR
Case 4: In-place operation on planar data
IppStatus ippiColorTwist32f_<mod>(Ipp<datatype>*
pSrcDst
[3], int
srcDstStep
, IppiSize
roiSize
, const Ipp32f
twist
[3][4]
);
Supported values for
mod
:
8u_IP3R
16u_IP3R
16s_IP3R
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.
pSrcDst
Pointer to the source and destination image ROI for the in-place operation.
srcDstStep
Distance, in bytes, between the starting points of consecutive lines in the source and destination image for the in-place operation.
roiSize
Size of the source and destination ROI in pixels.
twist
The array containing color-twist matrix elements.
Description
This function operates with ROI (see Regions of Interest in Intel IPP).
This function applies the color-twist matrix to all three color channel values in the integer source image to obtain the resulting data in the destination image. For example, the conversion from the
RGB
to the
YCbCr
format can be done as
Y = 0.299*R + 0.587*G + 0.114*B
Cb = - 0.16874*R - 0.33126*G + 0.5*B + 0.5
Cr = 0.5*R - 0.41869*G - 0.08131*B + 0.5
which can be described in terms of the following color twist matrix:
0.29900f 0.58700f 0.11400f 0.000f -0.16874f -0.33126f 0.50000f 128.0f 0.50000f -0.41869f -0.08131f 128.0f
Color-twist matrices may also be used to perform many other color conversions.
Return Values
ippStsNoErr
Indicates no error. Any other value indicates an error.
ippStsNullPtrErr
Indicates an error condition if
pSrc
,
pDst
, or
pSrcDst
is
NULL
.
ippStsSizeErr
Indicates an error condition if
roiSize
has a field with a zero or negative value.

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804