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POretaining image quality while drawing high resolution pdf to iphone?
 

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  1. POretaining image quality while drawing high resolution pdf to iphone?
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    <p>I have a problem related to pdf drawing in iPhone. When I draw the pdf in ipad it works fine but in iphone quality of image of page is not good. That image contains dark spots at the place of gray background.<br> Can anyone help me to solve this problem?</p> <p>thanks.</p> <pre><code>- (UIImage *) imageForPageIndex:(NSUInteger)pageIndex { UIImage *image = nil; if ([delegate illustration_Enable]) { CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); CGContextRef context = CGBitmapContextCreate(NULL, pageSize.width, pageSize.height, 8, /* bits per component*/ pageSize.width * 4, /* bytes per row */ colorSpace, kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big); CGColorSpaceRelease(colorSpace); CGContextClipToRect(context, CGRectMake(0, 0, pageSize.width, pageSize.height)); [self renderPageAtIndex:pageIndex OnContext:context]; CGImageRef cgimage = CGBitmapContextCreateImage(context); CGContextRelease(context); image = [UIImage imageWithCGImage:cgimage]; CGImageRelease(cgimage); } else { CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); CGContextRef context = CGBitmapContextCreate(NULL, pageSize.width, pageSize.height, 8, /* bits per component*/ pageSize.width * 4, /* bytes per row */ colorSpace, kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big); CGColorSpaceRelease(colorSpace); CGContextClipToRect(context, CGRectMake(0, 0, pageSize.width, pageSize.height)); [self renderPageAtIndex:pageIndex OnContext:context]; CGImageRef cgimage = CGBitmapContextCreateImage(context); CGContextRelease(context); image = [UIImage imageWithCGImage:cgimage]; CGImageRelease(cgimage); } return image; } -(void)renderPageAtIndex:(int)index OnContext:(CGContextRef)ctx{ if ([delegate illustration_Enable]) { if (index-1 == [imageList count]) { return; } UIImage *image = nil; image = [UIImage imageWithContentsOfFile:[imageList objectAtIndex:index-1]]; CGRect rect1 = CGRectMake(0, 0, image.size.width, image.size.height); CGRect rect2 = CGContextGetClipBoundingBox(ctx); CGAffineTransform transform = [self aspectFill:rect1 :rect2]; CGContextConcatCTM(ctx, transform); CGContextDrawImage(ctx, CGRectMake(0, 0, image.size.width, image.size.height), image.CGImage); } else { CGPDFPageRef page = CGPDFDocumentGetPage(pdf, index); CGRect rect1 = CGPDFPageGetBoxRect(page,kCGPDFMediaBox); CGRect rect2 = CGContextGetClipBoundingBox(ctx); CGAffineTransform transform; if (takeBookmarkImg) { transform = [self aspectFill:rect1 :rect2]; } else { transform = [self aspectFit:rect1 :rect2]; } CGContextConcatCTM(ctx, transform); CGContextDrawPDFPage(ctx, page); } } - (CGAffineTransform) aspectFit:(CGRect)innerRect :(CGRect) outerRect { scaleFactor = MIN(outerRect.size.width/innerRect.size.width, outerRect.size.height/innerRect.size.height); baseScaleFactor = scaleFactor; CGAffineTransform scale = CGAffineTransformMakeScale(scaleFactor, scaleFactor); CGRect scaledInnerRect = CGRectApplyAffineTransform(innerRect, scale); CGAffineTransform translation = CGAffineTransformMakeTranslation((outerRect.size.width - scaledInnerRect.size.width) / 2 - scaledInnerRect.origin.x-(totalMoveX+moveX), (outerRect.size.height - scaledInnerRect.size.height) / 2 - scaledInnerRect.origin.y+(totalMoveY+moveY)); return CGAffineTransformConcat(scale, translation); } </code></pre> <p>.</p>
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    1. UStjarratt
    1. USAbhishek Mishra
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    1. COCould you show us your code that you think is inadequate?
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      1. USjohnluttig
    2. COi have given my code and i hope it will be help full thanks for responding. @johnluttig
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      1. USAbhishek Mishra
    3. COCan you post a picture showing the difference between the iPad and iPhone versions? It might be a color space issue, or it could be something else entirely.
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      1. USuser1118321
 

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