ios - 从元数据中提取图像图片样式
<p><p>我正在使用 ios CGImageSourceCopyPropertiesAtIndex 为 ios 上的图像提取大量元数据。但我无法提取所有元数据,如 Mac Preview 应用程序或 exiftool 命令中显示的元数据。</p>
<p>我主要是缺少“图片样式”和“佳能”信息。</p>
<p>我是如何读取元数据的:</p>
<pre><code>NSURL *imageFileURL = ;
CGImageSourceRef imageSource = CGImageSourceCreateWithURL((CFURLRef)CFBridgingRetain(imageFileURL), NULL);
CFDictionaryRef props = CGImageSourceCopyPropertiesAtIndex(imageSource, 0, NULL);
NSLog(@"%@", props);
</code></pre>
<p>谁有提示?</p>
<p>这是使用预览的信息</p>
<p> <img src="/image/qCU7f.png" alt="enter image description here"/> </p>
<p>这是来自 NSLog 的信息:</p>
<pre><code>2013-04-02 09:50:06.885 i2 {
ColorModel = RGB;
DPIHeight = 72;
DPIWidth = 72;
Depth = 8;
Orientation = 1;
PixelHeight = 1728;
PixelWidth = 2592;
"{Exif}" = {
ApertureValue = "5.375";
BodySerialNumber = 1280809746;
ColorSpace = 1;
ComponentsConfiguration = (
1,
2,
3,
0
);
CustomRendered = 0;
DateTimeDigitized = "2012:12:24 12:58:46";
DateTimeOriginal = "2012:12:24 12:58:46";
ExifVersion = (
2,
3
);
ExposureBiasValue = 0;
ExposureMode = 1;
ExposureProgram = 1;
ExposureTime = "0.003125";
FNumber = "6.3";
Flash = 16;
FlashPixVersion = (
1,
0
);
FocalLength = 22;
FocalPlaneResolutionUnit = 2;
FocalPlaneXResolution = "2857.773";
FocalPlaneYResolution = "2904.202";
ISOSpeedRatings = (
3200
);
LensModel = "EF-S10-22mm f/3.5-4.5 USM";
LensSpecification = (
10,
22,
0,
0
);
MeteringMode = 5;
PixelXDimension = 2592;
PixelYDimension = 1728;
SceneCaptureType = 0;
ShutterSpeedValue = "8.375";
SubsecTime = 35;
SubsecTimeDigitized = 35;
SubsecTimeOriginal = 35;
WhiteBalance = 1;
};
"{IPTC}" = {
StarRating = 0;
};
"{TIFF}" = {
DateTime = "2012:12:24 12:58:46";
Make = Canon;
Model = "Canon EOS 7D";
Orientation = 1;
ResolutionUnit = 2;
XResolution = 72;
YResolution = 72;
"_YCbCrPositioning" = 2;
};
}
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>请注意,<code>kCGImagePropertyMakerCanonDictionary</code>、<code>kCGImagePropertyExifAuxDictionary</code> 和 <code>kCGImagePropertyTIFFDictionary</code> 不是 <code>CGImageSourceCopyPropertiesAtIndex</code> 可以理解的选项。它们是它返回的字典中的键。通过它们似乎不会导致任何问题,但它也没有实现任何目标。</p>
<p>没有声明的属性键来访问我可以看到的图片样式数据,但它似乎是由 <code>CGImageSourceCopyPropertiesAtIndex</code> 返回的。如果您转储 <code>props</code> 字典,您应该会看到一个 <code>{PictureStyle}</code> 键,其中包含包含感兴趣信息的字典。您还会看到 <code>{MakerCanon}</code> 键。这对应于常量<code>kCGImagePropertyMakerCanonDictionary</code>,并且该字典中的属性在<a href="http://developer.apple.com/library/ios/#documentation/GraphicsImaging/Reference/CGImageProperties_Reference/Reference/reference.html#//apple_ref/doc/constant_group/Canon_Camera_Dictionary_Keys" rel="noreferrer noopener nofollow">relevant section of the documentation</a> 中描述。 .</p></p>
<p style="font-size: 20px;">关于ios - 从元数据中提取图像图片样式,我们在Stack Overflow上找到一个类似的问题:
<a href="https://stackoverflow.com/questions/15474524/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/15474524/
</a>
</p>
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