#define USE_PROXY // works without proxy ...

#include <cassert>
#include <cstring>
#include <iostream>
#include <vector>

#include <OpenImageIO/imageio.h>
#include <OpenImageIO/filesystem.h>

int main(int argc, char* argv[])
{
    const int res_x    = 1;
    const int res_y    = 1;
    const int channels = 3;
    std::vector<unsigned char> output_data(res_x * res_y * channels, 0);

    assert(argc == 1+1);
    const char* filename = argv[1];
    
    OIIO::ROI roi(0, res_x, 0, res_y, 0, 1, 0, channels);
    OIIO::TypeDesc desc = OIIO::TypeDesc::UINT8;
    OIIO::ImageSpec image_spec(roi, desc);
    image_spec["oiio:ColorSpace"] = "sRGB"; // .. or without this line

#ifdef USE_PROXY
    OIIO::Filesystem::IOFile proxy(filename, OIIO::Filesystem::IOProxy::Write);
    std::unique_ptr<OIIO::ImageOutput> output = OIIO::ImageOutput::create("dummy.tif", &proxy);
    bool success = output->open("dummy2.tif", image_spec);
    assert(success);
#else
    std::unique_ptr<OIIO::ImageOutput> output = OIIO::ImageOutput::create(filename);
    bool success = output->open(filename, image_spec);
    assert(success);
#endif

    success = output->write_scanlines(
        0, res_y, 0, desc, output_data.data(), OIIO::AutoStride, OIIO::AutoStride);
    assert(success);
    output->close();

    return 0;
}