ClipboardPasteImageExample.cs

/// For this to work you need to copy these 2 files:
/// "YOUR UNITY LOCATION"\Editor\Data\Mono\lib\mono\X.X\System.Drawing.dll
/// "YOUR UNITY LOCATION"\Editor\Data\Mono\lib\mono\X.X\System.Windows.Forms.dll
/// ..to a "Plugins" folder within your project
/// 
/// For this example to work, you need to have a (UI) Canvas object in your scene
/// Put this script on any object
/// 
/// Tested on windows, not sure if it works on any other platform
/// 
/// Original solution by Hellium found on http://answers.unity.com/answers/1499662/view.html
/// example by Nothke
/// 

using UnityEngine;
using UnityEngine.UI;

public class ClipboardPasteImageExample : MonoBehaviour
{
    Canvas _canvas;
    Canvas canvas { get { if (_canvas) return _canvas; else return FindObjectOfType<Canvas>(); } }

    void Update()
    {
        bool ctrl = Input.GetKey(KeyCode.LeftControl) || Input.GetKeyDown(KeyCode.RightControl);

        if (ctrl && Input.GetKeyDown(KeyCode.V))
            CreateImageFromClipboard();
    }


    void CreateImageFromClipboard()
    {
        Texture2D texture = RetrieveFromClipboard();
        if (texture == null) return;

        texture.wrapMode = TextureWrapMode.Clamp;

        GameObject go = new GameObject("PastedImage");
        go.transform.SetParent(canvas.transform);
        go.transform.position = Input.mousePosition;
        go.AddComponent<CanvasRenderer>();

        RawImage image = go.AddComponent<RawImage>();
        image.texture = texture;
        image.SetNativeSize();
    }

    // Original solution by Hellium on http://answers.unity.com/answers/1499662/view.html
    static Texture2D RetrieveFromClipboard()
    {
        System.Drawing.Image image = System.Windows.Forms.Clipboard.GetImage();

        if (image == null)
        {
            Debug.LogError("No image found in clipboard");
            return null;
        }

        System.IO.MemoryStream s = new System.IO.MemoryStream(image.Width * image.Height);
        image.Save(s, System.Drawing.Imaging.ImageFormat.Png);
        Texture2D texture = new Texture2D(image.Width, image.Height);
        texture.LoadImage(s.ToArray());
        s.Close();
        s.Dispose();
        return texture;
    }
}