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PONSImage Image Size With Multiple Layers
 

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  1. PONSImage Image Size With Multiple Layers
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    <p>I have a <strong>Mac</strong> (not iOS) application that allows the user to select one or more images with <strong>NSOpenPanel</strong>. What I have trouble with is how to get correct dimensions for multiple-layered images. If an image contains one layer or compressed, the following will get me correct image dimensions with the file path.</p> <pre><code>NSImage *image0 = [[NSImage alloc] initWithContentsOfFile:path]; CGFloat w = image0.size.width; CGFloat h = image0.size.height; </code></pre> <p>But if I select an image that has multiple layers, I'll get strange numbers. For example, I have a single-layer image whose dimensions are 1,440 x 900 px according to <strong>Fireworks</strong>. If I add a small layer of a circle and save an image as <strong>PNG</strong> and read it, I get 1,458 x 911 px. According to <a href="https://stackoverflow.com/questions/9264051/nsimage-size-not-real-size-with-some-pictures">this topic</a> and <a href="https://stackoverflow.com/questions/3739165/nsimage-size-is-wrong">this topic</a>, they suggest that I read the largest layer. Okay. So I've created a function as follows.</p> <pre><code>- (CGSize)getimageSize :(NSString *)filepath { NSArray * imageReps = [NSBitmapImageRep imageRepsWithContentsOfFile:filepath]; NSInteger width = 0; NSInteger height = 0; for (NSImageRep * imageRep in imageReps) { if ([imageRep pixelsWide] &gt; width) width = [imageRep pixelsWide]; if ([imageRep pixelsHigh] &gt; height) height = [imageRep pixelsHigh]; } NSSize size = CGSizeMake((CGFloat)width, (CGFloat)height); return size; } </code></pre> <p>Using the function above, I get wrong dimensions (1,458 x 911 px) instead of 1,440 x 900 px. Actually, I had the same problem when I was developing Mac applications with REAL Stupid till a few years ago. So how can I get correct dimensions when an image contains multiple layers?</p> <p>Thank you for your advice.</p>
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    1. USCommunity
    1. USEl Tomato
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    1. COif you open that PNG using Apple's Preview app, is the size of the image 1440 x 900 or is it 1458 x 911?
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      1. USMichael Dautermann
    2. COThat's a good point. It's 1,440 x 900 px, according to Preview's General Info.
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      1. USEl Tomato
    3. COI think I now know why the app gives me odd numbers. The image DPI appears to be 71.12. The original image was generated with sips (shell).
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      1. USEl Tomato
 

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