Hewlett Packard Research is perfecting its software methods for automatically removing photo flash red-eye with its RedBot.net service. By submitting photos to this service you can help them make it better, and have your JPEG red-eye photos fixed for free! Red-eye is that familiar problem where a subject's eyes in a flash photograph appear red instead of their normal color. As shown below the photo on the left is how the image should appear (as corrected by RedBot) while the photo on the right is what the camera produced. The reason this happens is best illustrated in the graphic below (from http://FAQ.redbot.net). In humans the red color observed is due to the direct reflection of the flash off the blood vessels of the retina. The camera captures both the burst of light AND the reddish hue of the reflection. The more compact the camera the worse the effect is --the closer to the flash the lens is the more likely you are to get red-eye. When-ever the angle beta is less than alpha red-eye will occur. Past approaches to mitigate this effect simply strobe the eye prior to the exposure to reduce the pupil size -a technique employed in almost all camera. A pre-flash is expensive from a power perspective and has limited efficiency. Besides not always reducing red-eye, subjects --especially children-- often presume the initial flash is for the photo, then move to ruin the composition not realizing the actual photograph is moments later. Using a single flash with post-exposure software correction is less expensive from a power perspective and is ideal for today's tiny cameras and cell phone cameras where power is at a premium and the red-eye effect is exacerbated. RedBot actually employs three algorithms: one based on face detection, an eye-detector-based algorithm, and one licensed from FotoNation Inc. of San Francisco. Each photo submitted to RedBot uses one of these algorithms selected at random. The Web service logs the details and records feedback from the user. This wide testing helps improve red-eye correction performance for HP's cameras and printers. The HP R707 was the first camera to have red-eye correction built in. Several thousand users have already corrected their red-eye photos with RedBot and have been pleased with the results. Red-eye corrected JPEG images are returned with the highest quality preserving the integrity of the original. Try it out for your self at http://redbot.net and tell us what you think below?