Hi how can i read Png image to NSImage. I tried the following way,but when i get the width and size of the image i'm getting some weird value.. if any one can direct me in right path.. highly appropriate..

NSImage * picture = [[NSImage alloc] initWithContentsOfFile: [bundleRoot stringByAppendingString:tString]];

 NSLog(@"sixe %d %d",picture.size.width, picture.size.height);
 if( picture ){ 
  NSLog(@"Picture is not null"); 
 }else {
  NSLog(@"Picture is null.");
 }

Thanks