ray-cast/lut

color lookup tables (LUTs) for color grading

Hi there, I am a SDE.

🏢 Job：Graphics, engine, art.

🛠 Favorite languages：C++ and Hlsl.

💬 Good languages: C++、Hlsl、Glsl、Rust、TypeScript、nodejs、C#（Programming without any language limitations）

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🎨 Side projects：Technical artist、Graphics Engine

lut's Issues

Example?

Hi,

Thanks for the library.
I'm trying the samples without luck.

Here is my reproducible sample:

#include <iostream>
#include "lut.hpp"

#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"
#define STB_IMAGE_WRITE_IMPLEMENTATION
#include "stb_image_write.h"

int main()
{

  std::string lut_name = "default";
  std::string image_path = "image";
  std::string out_path = "image";

  int width, height, channels;
  auto *img = stbi_load(image_path.c_str(), &width, &height, &channels, 3);

  if (img == nullptr)
  {
    printf("Error in loading the image\n");
    return 1;
  }

  auto lut = octoon::image::lut::parse(lut_name);

  for (std::size_t i = 0; i < width; i++)
  {
    for (std::size_t j = 0; j < height; j++)
    {
      auto *px = img + (i * j) * 3;

      auto data = lut.lookup(px[0], px[1], px[2]); // The (r,g,b) can be extended to support these types of std::uint8_t, std::uint16_t, std::uint32_t, float, double

      px[0] = data[0];
      px[1] = data[1];
      px[2] = data[2];
    }
  }

  stbi_write_png(out_path.c_str(), width, height, 3, img, width * 3);

  stbi_image_free(img);

  return 0;
}

But this is my output,

Can you point me in the right direction?
Thanks

没有image这个类呀

代码中貌似没有image这个类

Hey Guys I wrapper this c++ code to python !!!

Thanks for your origin code.
I have wrapper the lut.h to python package and already use it on my own project.
Enjoy it PyApplyLUT

Direct2D Lut Effect

Thanks for this, I use it as a raw effect for my video sequencer.

Could you take a look at Direct2D's LUT: https://docs.microsoft.com/en-us/windows/win32/direct2d/3d-lookup-table-effect

Also, this: https://docs.microsoft.com/en-us/windows/win32/api/d2d1_3/nf-d2d1_3-id2d1devicecontext2-createlookuptable3d

I'm new to lut and perhaps you can advise on what to pass to this function. The idea is to use GPU for the color grading instead of the bitmap directly.

This may also help: https://github.com/microsoft/Win2D/blob/master/winrt/lib/effects/EffectTransferTable3D.cpp

Best,