Hi,
I am using intel IPP library for decompressing the JPEG. Internally I am using "ReconstructMCURowLS" method of the the class "jpegdec.cpp" for reconstructing the JPEG. Reconstruction is successful but while converting 16bit signed to 8bit unsigned, I am geting all the "pDst8u" 0xff instead of 0x00. And resulting all colours(near to black) becomes white.
Below is the code path which is getting executed......
{
......
......
.......
if(m_dst.precision <= 8)
{
dstStep = curr_comp->m_cc_step;
pDst8u = curr_comp->GetCCBufferPtr(thread_id);
}
.......
..........
............
........
status = ippiReconstructPredRow_JPEG_16s_C1(
ptr,pPrevRow,pCurrRow,m_dst.width,m_ss);
.........
............
..........
..........
........
status = ippiConvert_16s8u_C1R(pPrevRow,m_dst.width*sizeof(Ipp16s),pDst8u,dstStep,roi);
........
........
}
Here I am not getting the expected result i.e. status should be "zero".
I have doubt here, am I using the wrong method to convert from 16s to 8u? or anything wrong I am doing?
Can someone please help me in this topic?
Thanks and Regards
Krushna
