Learning perfect pitch is, by definition, an oxymoron.
I'm surprised about the person who worked in a recording studio who had perfect pitch. I knew of a guy who had perfect pitch who could only play C instruments because he couldn't reconcile playing a written note that sounded different from the true pitch (transposing instruments). Hearing pitches that weren't true drove him so crazy, he got out of music altogether.
Relative pitch can, however, be trained. When I was working in D.C., I worked with another composer/arranger and we used to get together and one would play on the piano and the other would write down what he played and this extended to atonal music. To the best of my memory, neither of us made any mistakes.
I found the relationship between colour and pitch, interesting, though. Once in a class at the Honolulu Academy of Arts, I was painting an abstract and felt this presence over my shoulder. I looked and it was my teacher. "Are you a composer?" he asked. "Yes, how could you tell?" "From your use of colours". Hmm.