It can often be difficult to tell whether an image has been modified in one way or another, but tools like JPEGSnoop are able to give you a clue as to whether a file has been touched up.
The program actually analyzes the EXIF metadata while checking for traces of file compression while also analyzing the histograms. After it's been scanned, JPEGSnoop will give you a list of the information is has collected about a digital photograph.
Though not always perfect in its analysis, JPEGSnoop can tell you whether a file has been modified by an image editing program and are often rather accurate, thanks to the traces left behind by most editors.
Though the program doesn't really display the data is collects in the nicely format, it still has all of the data you might want to know about a modified photo.
JPEGSnoop supports many different image formats (JPEG, DNG, THM, PDF) and can also read some movie formats such as AVI and MOV.
JPEGsnoop is software which can view EXIF data.JPEGsnoop features and highlights:
JPEGsnoop is licensed as Freeware for Windows (32-bit and 64-bit) operating system / platform from camera software without restrictions. JPEGsnoop 1.8.0 is available to all software users as a free download (Freeware).
Compatibility with this image decoder software may vary, but will generally run fine under Microsoft Windows 10, 8, 8.1, 7, Vista and XP on either a 32-bit or 64-bit setup. A separate x64 version of JPEGsnoop may be available from Calvin Hass.
We have tested JPEGsnoop 1.8.0 against malware with several different programs. We certify that this program is clean of viruses, malware and trojans. [Read more]