pixel-to-world.cs

    private static Vector2 WorldToPixelCoords(Vector3 projectedPoint, Sprite sprite, Transform transform)
    {
        var textureRect = sprite.textureRect;
        var spriteBounds = sprite.bounds;

        var localPoint = transform.InverseTransformPoint(projectedPoint);

        localPoint.x = (localPoint.x - spriteBounds.min.x) / (spriteBounds.size.x);
        localPoint.y = (localPoint.y - spriteBounds.min.y) / (spriteBounds.size.y);

        return new Vector2((textureRect.xMin + textureRect.width * localPoint.x),
                (textureRect.yMin + textureRect.height * localPoint.y));
    }

    private static Vector3 PixelToWorldCoords(Vector2 pixelCoords, Sprite sprite, Transform transform)
    {
        var textureRect = sprite.textureRect;
        var spriteBounds = sprite.bounds;

        var updatedLocalPoint = new Vector2((pixelCoords.x - textureRect.xMin)/textureRect.width,
            (pixelCoords.y - textureRect.yMin)/textureRect.height);

        var pointToTransform = new Vector2((updatedLocalPoint.x)*spriteBounds.size.x + spriteBounds.min.x,
            (updatedLocalPoint.y)*spriteBounds.size.y + spriteBounds.min.y);

        return transform.TransformPoint(pointToTransform);
    }