To obtain an organic pigment easily and efficiently dispersible to primary particle level without varying the crystal form by controlling pigment powder (including granule) to lower the packing strength of secondary particles as far as possible while keeping the primary particle and the crystal form of the pigment powder.

A step to separate a pigment from the state contacting with a solvent is used at least as the final stage of a pigment production process. In the above process, the pigment is dried by heating a solvent-containing wet cake having a pigment solid concentration of ≤70 wt.% at or above the room temperature under reduced pressure of preferably ≤10 mmHg. The organic pigment produced by this process is preferably titanyl phthalocyanine having the maximum diffraction peak of the Bragg angle 2θ of 27.2°±0.2° determined by using the characteristic X-ray of Cu-Kα (wavelength, 1.514). A dispersion for electrophotographic receptor can be prepared by dispersing the organic pigment in a solvent.