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POUIImageJPEGRepresentation giving 2x images on retina display
 

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  1. POUIImageJPEGRepresentation giving 2x images on retina display
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    <p>I have this code, which creates an image, and then adds some effects to it and sizes it down to make <code>largeThumbnail</code>.</p> <pre><code>UIImage *originalImage = [UIImage imageWithData:self.originalImage]; thumbnail = createLargeThumbnailFromImage(originalImage); NSLog(@"thumbnail: %f", thumbnail.size.height); NSData *thumbnailData = UIImageJPEGRepresentation(thumbnail, 1.0); </code></pre> <p>Later on:</p> <pre><code>UIImage *image = [UIImage imageWithData:self.largeThumbnail]; NSLog(@"thumbnail 2: %f", image.size.height); </code></pre> <p>NSLog returns:</p> <pre><code>thumbnail: 289.000000 thumbnail 2: 578.000000 </code></pre> <p>As you can see, when it converts the image back from data, it makes it 2x the size. Any ideas why this may be happening?</p> <p>Large thumbnail code:</p> <pre><code>UIImage *createLargeThumbnailFromImage(UIImage *image) { UIImage *resizedImage; resizedImage = [image imageScaledToFitSize:LARGE_THUMBNAIL_SIZE]; CGRect largeThumbnailRect = CGRectMake(0, 0, resizedImage.size.width, resizedImage.size.height); UIGraphicsBeginImageContextWithOptions(resizedImage.size, NO, 0); CGContextRef context = UIGraphicsGetCurrentContext(); //Image CGContextTranslateCTM(context, 0, resizedImage.size.height); CGContextScaleCTM(context, 1.0, -1.0); CGContextDrawImage(context, largeThumbnailRect, resizedImage.CGImage); //Border CGContextSaveGState(context); CGRect innerRect = rectForRectWithInset(largeThumbnailRect, 1.5); CGMutablePathRef borderPath = createRoundedRectForRect(innerRect, 0); CGContextSetStrokeColorWithColor(context, [[UIColor whiteColor] CGColor]); CGContextSetLineWidth(context, 3); CGContextAddPath(context, borderPath); CGContextStrokePath(context); CGContextRestoreGState(context); UIImage *thumbnail = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return thumbnail; } </code></pre>
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    1. USAndrew
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    1. CODo _you_ have any ideas why it may be happening? What have you tried to debug this yourself?
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      1. USJosh Caswell
    2. COI've put in additional NSLogs, which revealed that it happens at the point where the image gets converted back from NSData.
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      1. USAndrew
 

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