PDF thumbnails in iPad are blurry - iphone

Question

I am creating thumbnails and showing those thumbnails in gridView(using AQgridView). Thumbnails shown in gridView is too blurry and is not what I want. I am attached my code. Please help.
Here is my code:-
- (void)viewDidLoad
{
[super viewDidLoad];
imageArray = [[NSMutableArray alloc] init];
self.gridView = [[AQGridView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
self.gridView.autoresizingMask = UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight;
self.gridView.autoresizesSubviews = YES;
self.gridView.delegate = self;
self.gridView.dataSource = self;
[self.view addSubview:gridView];
[self makeThumbs];
// Do any additional setup after loading the view from its nib.
}
///////////Making thumb from PDF file///////////////
-(void)makeThumbs{
NSString* finalPath = [[NSBundle mainBundle] pathForResource:#"Maths" ofType:#"pdf" inDirectory:nil];
NSURL* pdfFileUrl = [NSURL fileURLWithPath:finalPath];
CGPDFDocumentRef pdf = CGPDFDocumentCreateWithURL((__bridge CFURLRef)pdfFileUrl);
CGPDFPageRef page;
CGRect aRect = CGRectMake(0, 0, 70, 100); // thumbnail size
UIGraphicsBeginImageContext(aRect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
NSUInteger totalNum = CGPDFDocumentGetNumberOfPages(pdf);
for(int i = 0; i < totalNum; i++ ) {
UIImage* thumbnailImage;
CGContextSaveGState(context);
CGContextTranslateCTM(context, 0.0, aRect.size.height);
CGContextScaleCTM(context, 1.0, -1.0);
CGContextSetGrayFillColor(context, 1.0, 1.0);
CGContextFillRect(context, aRect);
// Grab the first PDF page
page = CGPDFDocumentGetPage(pdf, i + 1);
CGAffineTransform pdfTransform = CGPDFPageGetDrawingTransform(page, kCGPDFMediaBox, aRect, 0, true);
// And apply the transform.
CGContextConcatCTM(context, pdfTransform);
CGContextDrawPDFPage(context, page);
// Create the new UIImage from the context
thumbnailImage = UIGraphicsGetImageFromCurrentImageContext();
//Use thumbnailImage (e.g. drawing, saving it to a file, etc)
CGContextRestoreGState(context);
[imageArray addObject:thumbnailImage];
}
NSLog(#"image array count is %d",[imageArray count]);
if ([imageArray count]>0) {
[self.gridView reloadData];
}
UIGraphicsEndImageContext();
CGPDFDocumentRelease(pdf);
}
Here image showing blurry thumbnails that are created on iPad Simulator

Answer 1

Try using UIGraphicsBeginImageContextWithOptions passing 0.0 as scale (to use the screen scale).