Screen Capture of particular UI elements

ScreenshotNow.cs

using UnityEngine;
using System.Collections;
using System.IO;
using UnityEngine.UI;
public class ScreenshotNow : MonoBehaviour 
{
	public RectTransform rectT; // Assign the UI element which you wanna capture
    public Image img;
	int width; // width of the object to capture
	int height; // height of the object to capture

	// Use this for initialization
	void Start () 
	{
		width = System.Convert.ToInt32(rectT.rect.width); 
		height = System.Convert.ToInt32(rectT.rect.height);
	}
	
	// Update is called once per frame
	void Update () 
	{
		if (Input.GetMouseButtonDown (0)) 
		{
			//StartCoroutine(takeScreenShot ()); // screenshot of a particular UI Element.
		}
		if (Input.GetKeyDown (KeyCode.A)) 
		{
			Application.CaptureScreenshot ("FullPageScreenShot.png");
		}
	
	}
	public IEnumerator takeScreenShot()
	{
		yield return new WaitForEndOfFrame (); // it must be a coroutine 

		Vector2 temp = rectT.transform.position;
		var startX = temp.x - width/2;
		var startY = temp.y - height/2;

		var tex = new Texture2D (width, height, TextureFormat.RGB24, false);
		tex.ReadPixels (new Rect(startX, startY, width, height), 0, 0);
		tex.Apply ();

		// Encode texture into PNG
		var bytes = tex.EncodeToPNG();
		Destroy(tex);

		//File.WriteAllBytes(Application.dataPath + "ScreenShot.png", bytes);

        string imgsrc = System.Convert.ToBase64String(bytes);
        Texture2D scrnShot = new Texture2D(1, 1, TextureFormat.ARGB32, false);
        scrnShot.LoadImage(System.Convert.FromBase64String(imgsrc));

        Sprite sprite = Sprite.Create(scrnShot, new Rect(0, 0, scrnShot.width, scrnShot.height), new Vector2(.5f, .5f));
        img.sprite = sprite; 

    }

    public void Capture()
    {
        StartCoroutine(takeScreenShot()); // screenshot of a particular UI Element.
    }
}

This script takes screenshot of just the required UI object and saves to disk.

`using System.Collections;
using UnityEngine;
using UnityEngine.UI;

public class TakeScreenshotAndSave : MonoBehaviour
{
//Object To Screenshot
[SerializeField] private RectTransform _objToScreenshot;

//Assign the button to take screenshot on clicking
[SerializeField] private Button _takeScreenshotButton;

void Start()
{
    _takeScreenshotButton.onClick.AddListener(OnClickTakeScreenshotAndSaveButton);
}

private void OnClickTakeScreenshotAndSaveButton()
{
    StartCoroutine(TakeSnapShotAndSave());
}

//Using a Coroutine instead of normal method
public IEnumerator TakeSnapShotAndSave()
{
    //Code will throw error at runtime if this is removed
    yield return [new](http://www.google.com/search?q=new+msdn.microsoft.com) WaitForEndOfFrame();

    //Get the corners of RectTransform rect and store it in a array vector
    Vector3[] corners = [new](http://www.google.com/search?q=new+msdn.microsoft.com) Vector3[4];
    _objToScreenshot.GetWorldCorners(corners);

    //Remove 100 and you will get error
    int width = ((int)corners[3].x - (int)corners[0].x) - 100;
    int height = (int)corners[1].y - (int)corners[0].y;
    var startX = corners[0].x;
    var startY = corners[0].y;

    //Make a temporary texture and read pixels from it
    Texture2D ss = [new](http://www.google.com/search?q=new+msdn.microsoft.com) Texture2D(width, height, TextureFormat.RGB24, false);
    ss.ReadPixels([new](http://www.google.com/search?q=new+msdn.microsoft.com) Rect(startX, startY, width, height), 0, 0);
    ss.Apply();

    Debug.Log("Start X : " + startX + " Start Y : " + startY);
    Debug.Log("Screen Width : " + Screen.width + " Screen Height : " + Screen.height);
    Debug.Log("Texture Width : " + width + " Texture Height : " + height);

    //Save the screenshot to disk
    byte[] byteArray = ss.EncodeToPNG();
    string savePath = Application.persistentDataPath + "/ScreenshotSave.png";
    System.IO.File.WriteAllBytes(savePath, byteArray);
    Debug.Log("Screenshot Path : " + savePath);

    // Destroy texture to avoid memory leaks
    Destroy(ss);
}

}`