Grayscale in unity

Grayscale in unity
June 5, 2019 7 Comments Development Pushpendra Kumar

Here I am letting you know the answer of your question. how to convert normal image into black and white in unity with the help go c# coding. This is also called Grayscale in unity. Grayscale is the functionality which allow user to convert image colour into different colours. To modify colours in a more complex way. But if you are here then you do not need to worried about anything. Because we are going to let you know the basic of grayscale. Grayscale can do a simple version of color correction, i.e. remap grayscale image into arbitrary colors. This can be used for effects like heat vision.

Grayscale in unity for convert normal image into black and white

Texture2D graph;
    void ConvertToGrayscale()
        Color32[] pixels = graph.GetPixels32();
        for (int x = 0; x < graph.width; x++)
            for (int y = 0; y < graph.height; y++)
                Color32 pixel = pixels[x + y * graph.width];
                int p = ((256 * 256 + pixel.r) * 256 + pixel.b) * 256 + pixel.g;
                int b = p % 256;
                p = Mathf.FloorToInt(p / 256);
                int g = p % 256;
                p = Mathf.FloorToInt(p / 256);
                int r = p % 256;
                float l = (0.2126f * r / 255f) + 0.7152f * (g / 255f) + 0.0722f * (b / 255f);
                Color c = new Color(l, l, l, 1);
                graph.SetPixel(x, y, c);
        var bytes = graph.EncodeToPNG();
        System.IO.File.WriteAllBytes(Application.dataPath + "ImageSaveTest.png", bytes);

Now assign graph before calling this function.

graph = sprite.texture as Texture2D;
                image.sprite = sprite;

Quick test trying to convert this Basic256 script into Unity c# (trying to keep it close to original code..) maybe still some problems as the output seems darker than the example.

Result color = pixel’s color in the ramp image at (OriginalLuminance + RampOffset) index. For example, to invert the colors in the image you only need to flip the original color ramp horizontally (so that it goes from white to black instead of from black to white):

This is very simple solution for converting an image into black & white using c# script. In Conclusion, I hope this code helps you to finding your right answer. Thanks for visiting on this site.

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About The Author
Pushpendra Kumar I am passionate about mobile application development and professional developer at Colour Moon Technologies Pvt Ltd ( This website I have made so that I can meet with new challenges and can share here.
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