Medical image processing device, method for operating the same, and endoscope system

A method for operating a medical image processing device comprising the steps of:

• performing an input process of a first color image signal with an input processing unit;
• obtaining two or more pieces of first color information from the first color image signal, with a color information obtaining section;
• and
• performing a color information conversion process to convert the two or more pieces of first color information into two or more pieces of second color information with a color information converter, the color information conversion process making a difference D12y greater than a difference D12x and making a difference 13y greater than a difference 13x, the difference D12x being a difference between a first observation area and a second observation area that differs in position from the first observation area in a first feature space formed by the two or more pieces of first color information, the difference D12y being a difference between the first and second observation areas in a second feature space formed by the two or more pieces of second color information, the difference D13x being a difference between the first observation area and a third observation area that differs in position from the first and second observation areas in the first feature space, the difference D13y being a difference between the first and third observation areas in the second feature space.