Here's the best I could do in five minutes. I did a basic 'levels' cleanup to get the colors looking nice, then I blurred the daylights out of it, particularly the red channel, then I did what I could to sharpen up what was left.



Full-res link:
http://www.cs.rice.edu/~dwallach/photo/gertandmarsh.jpg

(although, there isn't any extra information in the higher-res version...)