ET puts the photos to the ultimate test.

As the OSCAR DE LA HOYA fishnet photo scandal continues, one key question at the heart of the matter remains -- are the photos real, or faked?

Tonight on ET, we put the photos to the ultimate test.

"For the first time I recently had the chance to look at five of the photographs," forensic photo expert Professor JEFF SEDLIK tells our MARK STEINES of the various pics appearing to show the champion boxer in such clothing as fishnet stockings, panties, high heels and a micro-miniskirt.

Sedlik has been quoted as saying that the controversial photos appeared to be retouched, but he based those comments on poor, low-resolution images.

"I was asked to review images off of a Web site, and those files were severely degraded," he says. "The process of saving images for display on Web sites typically causes 'artifacts' to appear in the images, which often cannot be distinguished from retouching." These artifacts appeared in the images previously reviewed by Sedlik.

Now, ET is the first and only show to provide the professor with the high-resolution files needed to make a more accurate assessment. Sedlik says he studied one particular image for about one hour, and reveals that even in the high resolution images, there are signs that the photos may have been altered.

"In some of the images, the seam between the head and the body has the appearance of being retouched in the jawline and neck area, and there are suspicious blurred areas as well," he points out. "In addition, based on the type of camera that is indicated in the metadata, the shadows are in the wrong place."

Given the fact that most computers today contain software that can enable photo retouching, could an amateur have faked these photos?

"Now that ET has provided me with access to high resolution images, I have been able to more carefully analyze the images," says Sedlik. "In this instance, I can't find any conclusive evidence that they have or have not been retouched, but if they were retouched, this was done by a skilled professional. Retouching and head swapping is a pervasive practice, in everything from car ads, to movie posters, and even in wedding photos. Photography these days is a house of mirrors. You can do anything. It is Alice in Wonderland, and we're in the rabbit hole."

Watch ET for more of Mark's interview with forensic photo expert Jeff Sedlik!

And for more information, go to photographyexpertwitness.com.