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It turns out that LBerger was on the right track. You have to use

cv::ocl::attachContext(PlatformName, platforms[0], context(), devices[0]());  // C++

or for C code of OpenCL:

cv::ocl::attachContext(PlatformName, platform, context, device);   // C

to use the context created by OpenCL, I was able to do it using the c++ code from my comment and I had to borrow some code to get the first 2 values, I'm sure there is a more efficient method (and one that doesn't assume you only have 1 platform):

// C Code Changes from my original Question
    cl_image_desc desc_src;
    desc_src.image_type        = CL_MEM_OBJECT_IMAGE2D;
    desc_src.image_width       = mat.cols;
    desc_src.image_height      = mat.rows;
    desc_src.image_depth       = 0;
    desc_src.image_array_size  = 0;
    desc_src.image_row_pitch   = mat.step[0];
    desc_src.image_slice_pitch = 0;
    desc_src.num_mip_levels    = 0;
    desc_src.num_samples       = 0;
    desc_src.buffer            = 0;

    size_t sz = 0;
    clGetPlatformInfo(platform, CL_PLATFORM_NAME, 0, 0, &sz);
    char PlatformName[sz+1];
    clGetPlatformInfo(platform, CL_PLATFORM_NAME, sz, PlatformName, 0);
    cv::ocl::attachContext(PlatformName, platform, context, device);
    IDKmem = clCreateImage(context, CL_MEM_READ_WRITE |  CL_MEM_COPY_HOST_PTR,&tif_format,&desc_src,mat.ptr(),&err);

Hope that helps someone else.