Optical analysis tool to identify true and false Photoshop photos-PS tutorial

According to foreign media reports, increasingly complex and fine-grained photo editing software allows people to modify photos. some people modify photos only for interest, while others commit fraud. Researchers are currently working on a series of digital forensics tools, including tools for analyzing Image light, to make it easier to identify whether a photo has been processed. According to foreign media reports, MIT's increasingly sophisticated photo editing software allows people to modify photos. some people modify photos only for interest, while others commit fraud. Researchers are currently working on a series of digital forensics tools, including tools for analyzing Image light, to make it easier to identify whether a photo has been processed. Micah Kimo Johnson, a scholar of Brain and Cognitive Science at the Massachusetts Institute of Technology, said light analysis tools are particularly useful in these tools, the reason is that it is "difficult" to "fake light" without a trace ". Therefore, even if a photo is forged with the naked eye, it is possible to use a ray analysis tool to discover clues that have been processed.
Many photos are spoofed by splicing different parts of two or more photos into one, while different parts of the photos are sometimes slightly different in the light. John Sen said those with strong inspector may notice these differences, but theoretically, "People are very insensitive to the light ". He said that in this case, Ray analysis tools become very useful because they can help people quantify the irregularities of light, the ability to analyze complex light conditions is far higher than that of the human eye. For example, this tool can detect the photos used as evidence and provide relevant information. John Sen pointed out that there are many light sources in different indoor environments, such as the electric light source and the window light source. each light source increases the complexity of the overall lighting effect of the photo.
Hany Farid, a professor of computer science at the University of Texas and co-author of Johnson, said: "For photo tampering, there is no so-called" silver button '." He pointed out that all kinds of fake photos can be identified by different tools.