Methods for capturing screenshots of the game view and the inspector in Unity (2018.3+)

CaptureEditorScreenshots.cs

// Drop these methods into a class in a folder named 'Editor'

[MenuItem("X/Capture Game &1")] 
static void CaptureGameScreenshot()
{

	EditorApplication.delayCall += () =>
	{

		var sceneName = UnityEngine.SceneManagement.SceneManager.GetActiveScene().name;

		int i = 0;
		string path;

		do
		{
			i += 1;
			path = $"Screenshots/{sceneName}-{i}.png";
		} while (System.IO.File.Exists(path));

		// We'd use CaptureScreenshotAsTexture here but it's bugged in
		// 2018.3 - it renders the Scene view :(
		ScreenCapture.CaptureScreenshot(path);
	};
}

// Screenshot capturing
[MenuItem("X/Capture Inspector &3")]
static void CaptureInspectorScreenshot()
{
	// https://forum.unity.com/threads/built-in-method-to-take-a-screenshot-of-the-inspector.564673/#post-4715168

	EditorWindow inspectorWindow = EditorWindow
		.GetWindow(typeof(Editor).Assembly.GetType("UnityEditor.InspectorWindow"));
	inspectorWindow.Focus();

	EditorApplication.delayCall += () =>
	{
		int inspectorWidth = (int)inspectorWindow.position.width * 2;
		int inspectorHeight = (int)inspectorWindow.position.height * 2;

		Color[] pixels = UnityEditorInternal.InternalEditorUtility.ReadScreenPixel(inspectorWindow.position.position, inspectorWidth, inspectorHeight);

		Texture2D inspectorTexture = new Texture2D(inspectorWidth, inspectorHeight, TextureFormat.RGB24, false);
		inspectorTexture.SetPixels(pixels);

		byte[] bytes = inspectorTexture.EncodeToPNG();

		var sceneName = UnityEngine.SceneManagement.SceneManager.GetActiveScene().name;

		int i = 0;
		string path;

		do
		{
			i += 1;
			path = $"Screenshots/{sceneName}-Inspector-{i}.png";
		} while (System.IO.File.Exists(path));

		System.IO.File.WriteAllBytes(path, bytes);
	};
}