The problem you're running into is digital cameras today will automatically adjust color to what it THINKS the subject should look like. Bright blue (cyan), bright yellow, or bright magenta colors will always be washed out. To prove it, take a pic of a yellow, blue, and pink highlighter, all the colors will be dulled out. Some cameras you can adjust/turn off the auto white-balance and it helps.
Specifically with your camera, the processor is adding magenta (I believe) into the equation (look around the pic, there should be some areas that have a red tint that shouldn't) to counter the blue. If you can't do anything with the camera, your only hope is to use a photo editor to remove the magenta that it adds.
On a side note, olympus is the only camera I've experimented with that actually had a yellow highlighter come out bright yellow.
Chris
-----
1.1.0 Irian x Jungle Carpet Pythons
1.2.0 Black Rats- Robert, Cady, Kylie
1.2.0 Albino FL Kings-Nick, Jessica, Ashley
1.1.0 Crimson Corns-Kane, Ruby
0.1.0 Het-Crimson Corns-Lola
0.1.0 White-Sided/Pos Het Albino Black Rat-Lita
1.0.0 Albino White-sided Black Rat-Rey
0.1.0 Albino/Het White-sided Black Rat-Stacey
1.2.0 Creamsicle Corns-Vince, Trish, Torrie
0.1.0 Fl King-Bonnie
1.0.1 Green Tree Pythons Biak-Brandon, Aru-Orochimaru
1.0.0 Flame X Blood Bearded-Ruff
2.4.0 Ball Pythons-Kritsy, Gretchen, Alexis, 100% het for albino balls- Naruto, Hinata, 66% het VPI Axanthic-Sasuke
0.1.0 Red-tail Boa-Xena
0.0.1 Savannah Monitor-Izzy