获取正确的图像宽度和高度的NSImage [英] Get the correct image width and height of an NSImage

问题描述

我使用下面的代码来获取NSImage的宽度和高度:

I use the code below to get the width and height of a NSImage:

NSImage *image = [[[NSImage alloc] initWithContentsOfFile:[NSString stringWithFormat:s]] autorelease];
imageWidth=[image size].width;
imageHeight=[image size].height;
NSLog(@"%f:%f",imageWidth,imageHeight);

但是有时imageWidth，imageHeight不会返回正确的值.例如，当我阅读图像时，EXIF信息将显示:

But sometime imageWidth, imageHeight does not return the correct value. For example when I read an image, the EXIF info displays:

PixelXDimension = 2272;
PixelYDimension = 1704;

但是imageWidth，imageHeight输出

But imageWidth, imageHeight outputs

521:390 

推荐答案

以像素为单位的图像尺寸存储在图像的NSImageRep中.如果您的文件仅包含一张图片，它将是这样的:

Dimensions of your image in pixels is stored in NSImageRep of your image. If your file contains only one image, it will be like this:

NSImageRep *rep = [[image representations] objectAtIndex:0];
NSSize imageSize = NSMakeSize(rep.pixelsWide, rep.pixelsHigh);

其中 image 是您的NSImage， imageSize 是您的图像大小(以像素为单位).

where image is your NSImage and imageSize is your image size in pixels.

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