CODEWITHSUNDEEP
objective-ccocoadpinsimage
mootymoots
mootymoots

Reputation: 4575

NSImage DPI Question

Can anyone tell me how I can get the true width and height of an NSImage? I have noticed that images that are a higher DPI than 72 come through with inaccurate width and height with the NSImage.size parameters.

I saw this example on Cocoadev:

NSBitmapImageRep *rep = [image bestRepresentationForDevice: nil];

NSSize pixelSize = NSMakeSize([rep pixelsWide],[rep pixelsHigh]);

However bestRepresentationForDevice is deprecated on 10.6... what can I use as an alternative, the documentation doesn't offer a different method?

Upvotes: 4

Views: 2651

Answers (3)

Mike Abdullah
Mike Abdullah

Reputation: 15013

Iterate through the image's representation looking for the one with the largest -size. Calling -bestRepresentationForRect:context:hints: should do this for you if you feed an extremely large rectangle.

Upvotes: 1

neoneye
neoneye

Reputation: 52231

@interface NSImage (Representation)
-(NSBitmapImageRep*)bitmapRepresentation;
@end

@implementation NSImage (Representation)
-(NSBitmapImageRep*)bitmapRepresentation {
    for (id thing in self.representations) {
        if (![thing isKindOfClass:[NSBitmapImageRep class]]) continue;
        return (NSBitmapImageRep*)thing;
    }
    return nil;
}
@end

Upvotes: 0

Comrade Yeti
Comrade Yeti

Reputation: 313

Build your NSBitmapImageRep from the TIFF representation of the NSImage

NSBitmapImageRep* rep = [NSBitmapImageRep imageRepWithData:[image TIFFRepresentation]];

Upvotes: 5

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