'Dark Knight' Shooter James Holmes -- No More ORANGE Hair

James Holmes is orange no more ... the "Dark Knight" shooter appeared in court this morning WITHOUT the bizarre dye job he was sporting on the night of the massacre in Aurora.

Holmes -- a natural brunette -- appeared in court for a hearing about a notebook he sent to a psychiatrist at the University of Colorado before the July shooting ... wearing a buzz cut.

Prosecutors have argued the notebook contains crucial information about Holmes' state of mind before the shooting -- but Holmes' defense attorneys said the information is protected under doctor-patient privilege, and shouldn't be released.