Pixel inset used for pixel adjustments for size and position.

You can set the transform.localScale to Vector3.zero in order to make the GUI texture always the same pixel size.

	transform.position = Vector3.zero;
	transform.localScale = Vector3.zero;
	guiTexture.pixelInset = Rect (50, 50, 100, 100);

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    void Example() {
        transform.position = Vector3.zero;
        transform.localScale = Vector3.zero;
        guiTexture.pixelInset = new Rect(50, 50, 100, 100);
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	def Example() as void:
		transform.position = Vector3.zero
		transform.localScale = Vector3.zero
		guiTexture.pixelInset = Rect(50, 50, 100, 100)