Selecting and copying only the black and gray of picture

Hi everyone,
Looking for some help. I am a Paramedic Instructor and want to clean up some heart rhythms to make them more neat and presentable for use during class. Below is the sort of image I would be working with.
What I would like to do is remove only the black and gray lines (when they print out of the EKG machine some lines have some gray in them) and place them on a neater cleaner background as below
(The image above I found on a website where the creator has 100's of EKGs that this has been done with, but have been unable to get him to tell me how it was done)
Im hoping someone will be able to figure out how this can be done and lend me some help. Also let me know if another Adobe product would be more useful in this situation.
**I have CS6 Master Collection so you know what programs I have available to use**
Warm regards,
Bryan
Flight Paramedic/Instructor, Maryland

Hi Bryan,
You can probably remove most of the red lines using some method in Photoshop, like Channel Mixer Adjustment Layer (set to Monochrome) or Black & White Adjustment Layer adjusting the Red slider. Then you may have to use Levels (or Dodge Tool) to make the remaining red lines (now light gray) turn white.
Once you have a BW EKG trace with no red, you can put it on a layer above a clean graph and set its Blend Mode to Multiply.

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