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POImage negative distortion on iOS 4.3
 

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  1. POImage negative distortion on iOS 4.3
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    <p>I guess, why I get image distortion on my app, when I use iOS 4.3 on iPad Simulator and device. Look at the screenshot. The same image is displayed normally on iOS 5.1 Simulator and device. Look at the second screenshot... How should I manage this? May be it is possible to write some code before displayed the JPEG? <img src="https://i.stack.imgur.com/7YPGq.png" alt="Distorted on iOS 4.3"> <img src="https://i.stack.imgur.com/5frct.png" alt="Normal on iOS 5.1"> Unfortunately, I have to repair it, coz my app must work on iOS 4.3 somehow.</p> <p>This is a method, that is used for the generation of thumbs: </p> <pre><code>- (UIImage*)imageByScalingAndCroppingForSize:(CGSize)targetSize { UIImage *sourceImage = self; UIImage *newImage = nil; CGSize imageSize = sourceImage.size; CGFloat width = imageSize.width; CGFloat height = imageSize.height; CGFloat targetWidth = targetSize.width; CGFloat targetHeight = targetSize.height; CGFloat scaleFactor = 0.0; CGFloat scaledWidth = targetWidth; CGFloat scaledHeight = targetHeight; CGPoint thumbnailPoint = CGPointMake(0.0,0.0); if (CGSizeEqualToSize(imageSize, targetSize) == NO) { CGFloat widthFactor = targetWidth / width; CGFloat heightFactor = targetHeight / height; if (widthFactor &gt; heightFactor) scaleFactor = widthFactor; // scale to fit height else scaleFactor = heightFactor; // scale to fit width scaledWidth = width * scaleFactor; scaledHeight = height * scaleFactor; // center the image if (widthFactor &gt; heightFactor) { thumbnailPoint.y = (targetHeight - scaledHeight) * 0.5; } else if (widthFactor &lt; heightFactor) { thumbnailPoint.x = (targetWidth - scaledWidth) * 0.5; } } UIGraphicsBeginImageContext(targetSize); // this will crop CGRect thumbnailRect = CGRectZero; thumbnailRect.origin = thumbnailPoint; thumbnailRect.size.width = scaledWidth; thumbnailRect.size.height = scaledHeight; [sourceImage drawInRect:thumbnailRect]; newImage = UIGraphicsGetImageFromCurrentImageContext(); if(newImage == nil) NSLog(@"could not scale image"); //pop the context to get back to the default UIGraphicsEndImageContext(); return newImage; } </code></pre> <p>However, if I don't use this to prepare my image, it is still negative, but works more slow, because images are resized automatically. </p> <p>This method is used to display image: </p> <pre><code>-(void) setImage:(UIImage*)image forState:(UIControlState) state { [self.buttonView setImage:image forState:state]; } </code></pre> <p>this way: </p> <pre><code>[current setImage:thumb forState:UIControlStateNormal]; </code></pre> <p>Yeah, I forgot to mention, that these guys are just custom buttons of a view controller. </p>
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      1. USCactuar
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    1. COProbably if you convert your .jpg to .png it works.
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      1. USGaroal
    2. COYou need to edit your question. Tell us how you create the image files, and show us the code that loads them and puts them on the screen.
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    3. CODone, I have added a method, I use to resize.
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      1. USwzbozon
 

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