Modified picture how to find traces of PS? -PS, pictures-IT information
Shop online or find information when they heard "the photos don't lie", but in many cases, there is not necessarily the truth. Because now many picture PS, most of the time now before us is not an authentic, original pictures. For a picture, how do we determine whether a PS, and how to find the original photos?
EXIF in the mystery
We all know when we use mobile phones or cameras to take pictures of it, which would be in the current photos, write the corresponding EXIF information, such as shooting, exposure and so on. If the photo through post-processing (such as PS), then this information will change, so by looking at the photo's EXIF information can determine whether the photo has been modified.
To view EXIF information, as long as the Explorer, open the corresponding photo, and then right-click to select "properties → details", and then in the window that opens you can see detailed information such as camera maker, Flash mode and other information.
? View EXIF information for photos
If the photo processed by the PS, so once again, we use the method above to view more information, can be seen in the Properties window to add a "program name" option, which will clearly mark this photo editor using PS, and this information by default in the resource manager was unable to delete or edit. It also means that as long as the photos appear like "Adobe Photoshop CS6", you indicate that the photo was PS.
? PS photos Adobe Photoshop CS6 appears after the words
Find fake pictures for more details
But is in need of attention, a lot of times just by simply looking at EXIF information may still not be able to determine the authenticity of the photos. Because some of the EXIF information can be human-edited, such as Explorer to go directly to the camera manufacturer and model information is modified, a photo was shot by unknown cottage, if users change it iPhone 6 shot, then how do we judge?
? EXIF camera information can be easily changed by modifying model and manufacturer
Modified the EXIF information and JPEGsnoop can help here to judge. JPEGsnoop is a professional to detect photo of original and EXIF data integrity software. After you start the JPEGsnoop photos onto the program window needs to identify, JPEGsnoop will automatically read the photo EXIF information. Windows will display the detailed test results as "Class 1-image processing/editing", it means that the photo has been edited.
▲ JPEGsnoop can see if the picture has been edited
JPEGsnoop through "Class x" to indicate the pictures were edited likelihood, if the result is Class 3 Note photo is original, Class 1 and Class 2 then the photo EXIF metadata is modified, Class 4, it means that the evidence is insufficient to determine. For photos we also identified as Class 4 can further judgments based on other points. Above modifies the ordinary mobile phone to iPhone picture taken 6 and 8 million pixel photo of the iPhone 6 configuration, the best quality picture resolution of default photograph size is 3264x2448, but the modified photo displays a resolution of 2085x1456, this is obviously a fake iPhone picture taken 6.
? By looking at other information to determine the authenticity of a photo
Enlarge photo
Of course, counterfeiters can also modify EXIF information and iPhone picture taken 6 consistent approach to fraud. For this type of forgery, we can combine photographs to determine other characteristics. To some dating website Shang provides of photos for cases, some dating who provides of so-called pigment without-makeup is glory beautiful, these photos we with PS or paint software, will pictures zoom 300% even 500%, view pictures details, if pictures has PS, in zoom many times Hou, in some excessive of place can obviously will found is not natural, through these details on can judge photos is after processing of.
▲ By enlargements of details can be found in the PS modifying traces
Color authenticity
In addition, we can also be judged according to the characteristics of the camera. In terms of imaging, Canon's digital SLR has the characteristic, the more cheaper entry-level models, the brighter the image sharpness. And high-end models, straight out of the results seems to be rather simple, neutral. Introduction to low-end models the default sharpness and saturation are often set higher, and high-end models in pursuit of material, straight out of the effect is simple. If low-end SLR forged for high-end SLR, possibility of fraud can be judged on color photos.
In short, we have to judge a picture of true and false, in addition to outside view with EXIF information, combined with the photo characteristics, characteristics basic shooting equipment can accurately determine the authenticity of a photograph.
Original photo where
When a picture is found to be false when, if we need to and how to find the original picture? Need to find a picture of the original source, we can use the various types of network intelligent image recognition to find it. As I can see a QQ Group a suitable for the production of roll up using picture, but the picture only 496x966, obviously this is just a small edit, if you want to make roll up to find the original source, download the PSD source file can be used to make finished products. Now open the http://shitu.Baidu.com/, then click on "local upload" upload access to thumbnails, automatically after successful upload Baidu to help us find similar pictures.
▲ Baidu reading can find similar pictures
Through a careful comparison, you can see the original of this picture from the thousands of networks, click on one of these links to see the source of the original image, you can see here is the original PSD image resolutions up to 1535x2835, it is suitable for producing roll up the raw material.
Note:
Download and use from the network picture, certainly within the scope of the provisions of the copyright law, rather than ignoring the original author's copyright, cause theft dispute and other issues.
被修改过的图片如何找出PS痕迹？ - PS,图片 - IT资讯
网上购物，或是查找信息时都听说过“有图有真相”，不过在很多时候，有图不一定就有真相。因为现在很多图片都会经过PS，很多时候显现在我们面前的并非是真实、原始的图片。那么对于一张图片，我们怎么判定是否经过PS，又该怎样去找到原始图片呢？
EXIF中有大玄机
大家知道当我们使用手机或者相机拍摄图片的时候，这些设备会在当前照片写入相应的EXIF信息，如拍摄的设备、曝光度等。如果照片经过后期处理（如PS），那么这些信息就会发生改变，因此通过查看照片的EXIF信息就可以判断出照片是否经过修改。
对于EXIF信息的查看，只要在资源管理器中打开相应的照片，然后右击选择“属性→详细信息”，接着在打开的窗口中就可以看到详细的信息了，如相机制造商、闪光灯模式等信息。
▲查看照片的EXIF信息
如果照片经过PS处理，那么我们再次使用上述方法查看详细信息，可以看到在属性窗口会增加一个“程序名称”的选项，里面会清晰标记了这张照片使用PS进行过编辑，而且这些信息默认在资源管理器中是无法删除或者编辑的。这也意味着只要照片出现类似“Adobe Photoshop CS6”字样，则表明该张照片已经被PS过了。
▲PS过后的照片会显示Adobe Photoshop CS6字样
查找造假图片的更多细节
不过需要注意的是，很多时候仅仅通过简单查看EXIF信息可能仍然无法判断出照片的真伪。因为一些EXIF信息可以被人为编辑，比如在资源管理器中就可以直接对相机制造商和型号信息进行修改，某张照片明明是不知名的山寨手机拍摄的，如果用户将其更改为iPhone 6拍摄，这时我们怎么进行判断？
▲通过修改EXIF信息可以轻易更改相机型号和制造商
对于修改过的EXIF信息，这里可以借助JPEGsnoop进行判断。JPEGsnoop是一款专业用于检测照片原始性和EXIF数据完整性的软件。启动JPEGsnoop后把需要鉴别的照片拖到程序窗口，这样JPEGsnoop会自动对照片EXIF信息进行读取。在窗口最后会显示具体的检测结果如“Class 1 -图像被处理/已编辑”，则表示照片已经被编辑过了。
▲JPEGsnoop可以查看图片是否已被编辑
JPEGsnoop通过“Class X”来表示图片被编辑可能性大小，一般如果结果为Class 3说明照片是原始的，Class 1和Class 2则说明照片EXIF元数据被修改过，Class 4则说明证据不足以判断。对于鉴定为Class 4的照片我们这还可以根据其他知识点进行进一步的判断。比如上述将普通手机修改为iPhone 6拍摄的照片，而在iPhone 6配置的800万像素的照片中，默认拍摄到的最佳质量的照片分辨率大小是3264×2448，但是上述修改过的照片其分辨率显示为2085×1456，显然这是一张伪造iPhone 6拍摄的照片。
▲通过查看其他信息可以判断照片的真伪
放大照片显真形
当然了，伪造者也可以通过修改EXIF信息和iPhone 6拍摄的照片一致的方法来造假。对于这类伪造，我们就可以结合照片其他特性进行综合判定。以一些相亲网站上提供的照片为例，有些相亲者提供的所谓素颜照却光彩靓丽，这些照片我们借助PS或者画图软件，将图片放大300%甚至500%，查看图片细节，如果图片有PS，在放大很多倍后，在一些过度的地方可以明显会发现很不自然，通过这些细节就可以判断照片是经过处理的。
▲在PS中通过放大照片的细节可以发现修改痕迹
色彩辨真伪
此外，我们还可以根据相机的一些特性进行判断。在成像方面，佳能的数码单反有这样的特点，越是便宜的入门机型，成像反而越鲜艳锐利。而越高端的机型，直接出片的效果往往显得较为朴素、中性。因为低端入门机型的默认锐度和饱和度往往设置得较高，而高端机型追求的是素材性，所以直接出片效果较为朴素。如果低端单反伪造为高端单反机，那么从照片色彩上就可以判断出造假的可能了。
总之，我们要判断一张照片的真假，除了借助EXIF信息查看外，再结合照片的特性、拍摄设备的特征等因素就基本可以准确判断一张照片的真伪了。
原始照片何处寻
当发现一个图片是假的时候，如果我们需要原始的图片又该怎么去寻找？需要查找图片的原始出处，我们可以借助各类网络智能识图进行查找。如笔者在某QQ群看到一张适合制作易拉宝宣传使用的图片，但是图片大小只有496×966，显然这只是一张编辑过的小图，如果要制作易拉宝必须找到原始出处，下载PSD源文件才能够用于制作成品。现在打开http://shitu.baidu.com/，然后点击“本地上传”上传获得的小图，上传成功后百度会自动帮助我们查找到同类图片。
▲通过百度识图可以查找同类图片
通过仔细比对，可以看到这张图片的原图来自千图网，点击其中的链接即可看到原始图片的出处，可以看到这里提供该图原始的PSD图片，分辨率高达1535×2835，正是可以适合制造易拉宝的原始素材。
注意：
在下载、使用来源于网络的图片时，请一定在版权法的规定范围内进行，而不是忽视原作者的版权，引发盗用纠纷等问题。