ImageConversion.EncodeToPNG

Parameters

Description

Encodes this texture into PNG format.

The returned byte array is the PNG "file". You can write them to disk to get the PNG file, send them over the network, etc.

This function works only on uncompressed, non-HDR texture formats. Texture.isReadable must be true.

The encoded PNG data will contain alpha channel for RGBA32, ARGB32 textures, and no alpha channel for RGB24 textures. For single-channel red textures ( R8, R16, RFloat and RHalf ), the encoded PNG data will be in grayscale. PNG data will not contain gamma correction or color profile information.

// Saves screenshot as PNG file.
using UnityEngine;
using UnityEngine.Networking;
using System.Collections;
using System.IO;

public class PNGUploader : MonoBehaviour
{
    // Take a shot immediately
    IEnumerator Start()
    {
        yield return UploadPNG();
    }

    IEnumerator UploadPNG()
    {
        // We should only read the screen buffer after rendering is complete
        yield return new WaitForEndOfFrame();

        // Create a texture the size of the screen, RGB24 format
        int width = Screen.width;
        int height = Screen.height;
        Texture2D tex = new Texture2D(width, height, TextureFormat.RGB24, false);

        // Read screen contents into the texture
        tex.ReadPixels(new Rect(0, 0, width, height), 0, 0);
        tex.Apply();

        // Encode texture into PNG
        byte[] bytes = ImageConversion.EncodeToPNG(tex);
        Object.Destroy(tex);

        // For testing purposes, also write to a file in the project folder
        // File.WriteAllBytes(Application.dataPath + "/../SavedScreen.png", bytes);


        // Create a Web Form
        WWWForm form = new WWWForm();
        form.AddField("frameCount", Time.frameCount.ToString());
        form.AddBinaryData("fileUpload", bytes);

        // Upload to a cgi script
        var w = UnityWebRequest.Post("http://localhost/cgi-bin/env.cgi?post", form);
        yield return w.SendWebRequest();

        if (w.result != UnityWebRequest.Result.Success)
        {
            Debug.Log(w.error);
        }
        else
        {
            Debug.Log("Finished Uploading Screenshot");
        }
    }
}

Additional resources: ReadPixels, WaitForEndOfFrame, LoadImage, EncodeArrayToPNG, EncodeNativeArrayToPNG, EncodeToJPG, EncodeToTGA, EncodeToEXR.