How to create UIImage from a PDF ios objective c

When i am creating a image from pdf , image does not come clearly.

 CGPDFPageRetain(page);
    CGRect curentPDFFrame=CGPDFPageGetBoxRect(page, kCGPDFMediaBox);
    UIGraphicsBeginImageContext(CGSizeMake(612, 792));
    CGContextRef context=UIGraphicsGetCurrentContext();
    //CGContextScaleCTM(context, 2.5, -2.5);
    CGContextSetRGBFillColor(context, 1.0,1.0,1.0,1.0);
    CGContextFillRect(context, CGRectMake(0, 0, 612, 792));
    CGContextSaveGState(context);
    CGContextTranslateCTM(context, 50.0, 792);
    CGContextScaleCTM(context, 1, -1);
    CGContextConcatCTM(context, CGPDFPageGetDrawingTransform(page, kCGPDFMediaBox, curentPDFFrame, 0, true));

    CGContextDrawPDFPage(context, page);
    CGContextRestoreGState(context);

    UIImage *thm = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

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