GammaInv
Converts a gamma-corrected R'G'B' image back to the original RGB image.
Syntax
Case 1: Not-in-place operation on integer pixel-order data
IppStatus ippiGammaInv_<mod>(const Ipp<datatype>*
pSrc
, int
srcStep
, Ipp<datatype>*
pDst
, int
dstStep
, IppiSize
roiSize
);
Supported values for
mod
:
8u_C3R |
16u_C3R |
8u_AC4R |
16u_AC4R |
Case 2: Not-in-place operation on integer planar data
IppStatus ippiGammaInv_<mod>(const Ipp<datatype>*
pSrc
[3], int
srcStep
, Ipp<datatype>*
pDst
[3], int
dstStep
, IppiSize
roiSize
);
Supported values for
mod
:
8u_P3R |
16u_P3R |
Case 3: Not-in-place operation on floating-point pixel-order data
IppStatus ippiGammaInv_<mod>(const Ipp32f*
pSrc
, int
srcStep
, Ipp32f*
pDst
, int
dstStep
, IppiSize
roiSize
, Ipp32f
vMin
, Ipp32f
vMax
);
Supported values for
mod
:
32f_C3R |
32f_AC4R |
Case 4: Not-in-place operation on floating-point planar data
IppStatus ippiGammaInv_32f_P3R (const Ipp32f*
pSrc
[3], int
srcStep
, Ipp32f*
pDst
[3], int
dstStep
, IppiSize
roiSize
, Ipp32f
vMin
, Ipp32f
vMax
);
Case 5: In-place operation on integer pixel-order data
IppStatus ippiGammaInv_<mod>(Ipp<datatype>*
pSrcDst
, int
srcDstStep
, IppiSize
roiSize
);
Supported values for
mod
:
8u_C3IR |
16u_C3IR |
8u_AC4IR |
16u_AC4IR |
Case 6: In-place operation on integer planar data
IppStatus ippiGammaInv_<mod>(Ipp<datatype>*
pSrcDst
[3], int
srcDstStep
, IppiSize
roiSize
);
Supported values for
mod
:
8u_IP3R |
16u_IP3R |
Case 7: In-place operation on floating-point pixel-order data
IppStatus ippiGammaInv_<mod>(Ipp32f*
pSrcDst
, int
srcDstStep
, IppiSize
roiSize
, Ipp32f
vMin
, Ipp32f
vMax
);
Supported values for
mod
:
32f_C3IR |
32f_AC4IR |
Case 8: In-place operation on floating-point planar data
IppStatus ippiGammaInv_32f_IP3R (Ipp32f*
pSrcDst
[3], int
srcDstStep
, IppiSize
roiSize
, Ipp32f
vMin
, Ipp32f
vMax
);
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 ROI in the pixel-order source image. Array of pointers to the ROI in each plane of the planar source image.
- srcStep
- Distance in bytes between starts of consecutive lines in the source image.
- pDst
- Pointer to the ROI in the pixel-order destination image. Array of pointers to the ROI in each plane of the planar destination image.
- dstStep
- Distance in bytes between starts 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 starts of consecutive lines in the source and destination image for the in-place operation.
- roiSize
- Size of the source and destination ROI in pixels.
- vMin,vMax
- Minimum and maximum values of the input floating-point data.
Description
This function operates with ROI (see
Regions of Interest in Intel IPP
).
This function converts a
gamma-corrected
R'G'B'
image back to the original
RGB
image. It uses the following equations:
for
R'
,
G'
,
B'
< 0.0812
R = R'/4.5
G = G'/4.5
B = B'/4.5
for
R'
,
G'
,
B'
≥
0.0812
Note that the channel intensity values are normalized to fit in the range of [0..1]. The gamma value is equal to 1/0.45 = 2.22 in conformity with
[ITU709]
specification.
Return Values
- ippStsNoErr
- Indicates no error. Any other value indicates an error.
- ippStsNullPtrErr
- Indicates an error condition ifpSrc,pDst, orpSrcDstisNULL.
- ippStsSizeErr
- Indicates an error condition ifroiSizehas a field with a zero or negative value.
- ippStsGammaRangeErr
- Indicates an error condition if the input data bounds are incorrect, that is,vMaxis less than or equal tovMin.