There are some fascinating techniques that can be used within Photoshop to enhance and reveal details that are physically impossible for the human eye to differentiate. Because the image above was saved as a JPG, this would not be actually possible with this image. A PNG or "lossless" image file format would be much better and still be internet browser viewable. JPG is a method for image compression that is "lossy" in that details, although not humanly visible at actual size, particular unperceived data is lost.

I have scanned "white" over exposed negatives, and made perfect color pictures of them that would be near impossible in an actual darkroom. In digital overexposure, the data is completely absent, but in film it's still in the chemical emulsions on the negative. I have in the past done amazing things such as download arial photographs from the US Geological Survey to enhance with various methods to reveal the various nexes of large game migration patterns for my elk hunts. And the file format they use is TIF, a virtually lossless format that is saved from a scan of the negative.

If you'd like to know more basic information on file formats & scanning tips...
Image File Formats - Which To Use?


PNG supports lossless compression, is compatible with Netscape 4.0 and Internet Explorer 4.0 or better, and is a tight competitor against TIF for image quality.