Easy ways Analyzing Authenticity A Digital Photo
Here are some tips to distinguish whether an image is genuine or whether only the results of engineering, posted on a mailing list by someone who has admitted to moving in the field of graphic photographs.
Tools and How
Tools needed: a computer program, and Adobe Photoshop. Will be better if you use a monitor with professional standards (High Resolution enough – Red.)
How to know:
1. The resolution of differences. Usually the images that have healing in a professional resolution 255 ppi, while taken with a digital camera normal (non-pro) is 72 ppi. When the two images (taken with the use of different quality tools) merged into one, and then to save in 72 ppi (jpg format with the Internet), and then converted back to 255 ppi with Photoshop and zoom in as much as possible, then the difference of pixel will visible.
2. Differences in skin color and tone. Differences with the body color of the face is not necessarily indicative of a photo that the results of engineering. It’s normal when there are differences in skin color face with a hand or other body part. This is because the difference in fineness and hair pores on the face with the other to affect the reflection of light.
So that meant the difference in color here is not just color, except tonnage, including point of light and dark dots. When we find a suspicious image, try to set the ‘brightness’ to monitor the maximum and ‘addicts’ to a minimum. Then see if the difference between the face with a light body. Alternatively, go with Photoshop filters and use HSB. Slide the ‘slider’ H and S to fall to the right. Usually the difference will direct light if two or more images become one.
3. Grain and noise. Generally, a good digital photo or scan results, have the noise, especially in the shadow areas (dark). Noise or grain is arising because of information bits are not caught the camera, so that the software compression a digital camera, the general interpolation. The camera of a different result in different compensation. To see clearly, note the photo on each channel (RGB or CMY). Usually, the obvious differences occur if the image is a sticker in the channel G (green) and B (blue).
4. Find a connection. When a photo of a photo be transplanted into another, some local connection. This is effective for image ‘Fake’ results of the labor people beginners. Usually in a photo-Fake with high technique is very difficult to find a connection because of the sophistication of Photoshop that can disguise the connection to step 255. However, often an expert will make negligence, for example, in the areas of hair, the connection chin, neck, and so forth.
5. Attention: the metadata that is embeded profile on a digital photo did not prove that the image is genuine or not. Unless the file is the form of RAW images (for example berekstension. Nef, or to Nikon. DCR for Kodak)
Thus some tips that have been presented by me, to test the authenticity of a photo. Of course there are many other techniques that can be to prove the authenticity of a photo. And vice versa, of course, will be more tips to berkelit and deny the authenticity of a photo.
But at least, the above tips will be able to stock your first (learning) to a photo analyst. Useful or not, depending on your ..
Related Posts:
Tags: Analyzing, Authenticity, Digital, Easy, Photo, ways
19.Dec.08 
photographs
You can leave a response, or trackback from your own site.