I don't think any actual photo was ever released.
Here's the original SF article and some FR threads (3) , but no photo.
S.F. man's astounding photo
Mysterious purple streak is shown hitting Columbia 7 minutes before it disintegrated
http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2003/02/05/MN192153.DTL
FR Search results for
S.F. man's astounding photo
http://www.freerepublic.com/focus/search?s=S.F.+man%27s+astounding+photo+&ok=Search&q=deep&m=any&o=score&SX=41994bd073c5d9c49cc8e49351eea042194d1686
There is an E-mail link to the reporter. Obviously he never followed up because Bush did it.