void Generate(int cubesize, int maxwidth,
const std::string & outputfile,
const std::string & configfile,
const std::string & incolorspace,
const std::string & outcolorspace)
{
int width = 0;
int height = 0;
int numchannels = 3;
GetLutImageSize(width, height, cubesize, maxwidth);
std::vector<float> img;
img.resize(width*height*numchannels, 0);
GenerateIdentityLut3D(&img[0], cubesize, numchannels, LUT3DORDER_FAST_RED);
if(!incolorspace.empty() || !outcolorspace.empty())
{
OCIO::ConstConfigRcPtr config = OCIO::Config::Create();
if(!configfile.empty())
{
config = OCIO::Config::CreateFromFile(configfile.c_str());
}
else if(getenv("OCIO"))
{
config = OCIO::Config::CreateFromEnv();
}
else
{
std::ostringstream os;
os << "You must specify an ocio configuration ";
os << "(either with --config or $OCIO).";
throw Exception(os.str().c_str());
}
OCIO::ConstProcessorRcPtr processor =
config->getProcessor(incolorspace.c_str(), outcolorspace.c_str());
OCIO::PackedImageDesc imgdesc(&img[0], width, height, 3);
processor->apply(imgdesc);
}
OIIO::ImageOutput* f = OIIO::ImageOutput::create(outputfile);
if(!f)
{
throw Exception( "Could not create output image.");
}
OIIO::ImageSpec spec(width, height, numchannels, OIIO::TypeDesc::TypeFloat);
// TODO: If DPX, force 16-bit output?
f->open(outputfile, spec);
f->write_image(OIIO::TypeDesc::FLOAT, &img[0]);
f->close();
delete f;
}
int main(int argc, char **argv)
{
if(argc<5)
{
std::cerr << USAGE_TEXT << std::endl;
exit(0);
}
const char * inputimage = argv[1];
const char * inputcolorspace = argv[2];
const char * outputimage = argv[3];
const char * outputcolorspace = argv[4];
OIIO::ImageSpec spec;
std::vector<float> img;
int imgwidth = 0;
int imgheight = 0;
int components = 0;
// Load the image
std::cerr << "Loading " << inputimage << std::endl;
try
{
OIIO::ImageInput* f = OIIO::ImageInput::create(inputimage);
if(!f)
{
std::cerr << "Could not create image input." << std::endl;
exit(1);
}
f->open(inputimage, spec);
std::string error = f->geterror();
if(!error.empty())
{
std::cerr << "Error loading image " << error << std::endl;
exit(1);
}
imgwidth = spec.width;
imgheight = spec.height;
components = spec.nchannels;
img.resize(imgwidth*imgheight*components);
memset(&img[0], 0, imgwidth*imgheight*components*sizeof(float));
f->read_image(OIIO::TypeDesc::TypeFloat, &img[0]);
delete f;
}
catch(...)
{
std::cerr << "Error loading file.";
exit(1);
}
// Process the image
try
{
// Load the current config.
OCIO::ConstConfigRcPtr config = OCIO::GetCurrentConfig();
// Get the processor
OCIO::ConstProcessorRcPtr processor = config->getProcessor(inputcolorspace, outputcolorspace);
// Wrap the image in a light-weight ImageDescription
OCIO::PackedImageDesc imageDesc(&img[0], imgwidth, imgheight, components);
// Apply the color transformation (in place)
processor->apply(imageDesc);
}
catch(OCIO::Exception & exception)
{
std::cerr << "OCIO Error: " << exception.what() << std::endl;
}
catch(...)
{
std::cerr << "Unknown OCIO error encountered." << std::endl;
}
// Write out the result
try
{
OIIO::ImageOutput* f = OIIO::ImageOutput::create(outputimage);
if(!f)
{
std::cerr << "Could not create output input." << std::endl;
exit(1);
}
f->open(outputimage, spec);
f->write_image(OIIO::TypeDesc::FLOAT, &img[0]);
f->close();
delete f;
}
catch(...)
{
std::cerr << "Error loading file.";
exit(1);
}
std::cerr << "Wrote " << outputimage << std::endl;
return 0;
}