Method and apparatus for converting color spaces and multi-color display apparatus using the color space conversion apparatus

An apparatus for converting an m-dimensional color space having first through m-th input color components to an n-dimensional color space having first through n-th output color components, m being less than n, comprising:

• an intermediate color component extractor extracting respective first through m-th intermediate color components and extracting respective m+1-th through n-th intermediate color components by linearly combining the first through m-th input color components;
• a dynamic range comparator analyzing the m+1-th through n-th intermediate color components determining whether the m+1-th through n-th intermediate color components are within a specified dynamic range for the m+1-th through n-th output color components;
• and
• a color component compensator compensating the first through n-th intermediate color components, to obtain the first through n-th output color components, based on a result of the analyzing and consideration of a dynamic range of the m+1-th through n-th intermediate color components being different from a dynamic range of the first through m-th input color components.

A color display apparatus for displaying an image signal having first through n-th output color components, comprising:

• an intermediate color component extractor extracting respective first through m-th intermediate color components and extracting respective m+1-th through n-th intermediate color components by linearly combining first through m-th input color components, m being less than n;
• a dynamic range comparator analyzing the m+1-th through n-th intermediate color components determining whether the m+1-th through n-th intermediate color components are within a specified dynamic range for the m+1-th through n-th output color components;
• a color component compensator compensating the first through n-th intermediate color components, to obtain the first through n-th output color components, based on a result of the analyzing and consideration of a dynamic range of the m+1-th through n-th intermediate color components being different from a dynamic range of the first through m-th input color components;
• and
• a display unit including n optical sources emitting light of wavelengths corresponding to the n output color components.

A method of displaying an image signal having first through n-th output color components, the method comprising:

• extracting, using at least one processing device, respective first through m-th intermediate color components and extracting respective m+1-th through n-th intermediate color components by linearly combining first through m-th input color components, m being less than n;
• analyzing the m+1-th through n-th intermediate color components determining whether the m+1-th through n-th intermediate color components are within a specified dynamic range for the m+1-th through n-th output color components;
• compensating the first through n-th intermediate color components, to obtain the first through n-th output color components, based on a result of the analyzing and consideration of a dynamic range of the m+1-th through n-th intermediate color components being different from a dynamic range of the first through m-th input color components;
• and
• emitting light of wavelengths corresponding to the n output color components.

A color conversion method, the method comprising:

• extracting, using at least one processing device, a CMY signal having cyan (C), magenta (M), and yellow (Y) color components from an input RGB signal having red (R), green (G), and a blue (B) color components by linearly combining the input R, G, and B color components;
• calculating respective intermediate color components of the R, G, B, C, M, and Y color components and scaling the respective intermediate components of the C, M, and Y color components;
• determining at least one dynamic range of the scaled C, M, and Y intermediate color components, and analyzing at least one of the scaled C, M, and Y intermediate color components to detect a signal with a dynamic range which exceeds the determined dynamic range, which is a dynamic range for the m+1-th through n-th output color components;
• and
• compensating at least one of the R, G, B, intermediate color components and at least one of the scaled C, M, and Y intermediate color components using the detected signal based upon consideration of a dynamic range of the C, M, and Y intermediate color components being different from a dynamic range of the input R, G, and B color components.

A color conversion method, the method comprising:

• determining first and second coefficient groups usable to extract from an input RGB signal having red (R), green (G), and blue (B) color components intermediate color components of a CMY signal having cyan (C), magenta (M), and yellow (Y) color components and of an RGB signal having red (R), green (G), and blue (B) color components, the CMY signal and the RGB signal being extracted from the input RGB signal;
• linearly combining, using at least one processing device, R, G, and B color components of the input R, G, and B signal and, using the first and the second coefficient groups, to extract intermediate color components of the R, G, B, C, M, and Y color components;
• scaling the intermediate color components of the C, M, and Y color components;
• analyzing the scaled intermediate color components of the C, M, and Y color components determining whether signal values of the scaled intermediate color components of the C, M, and Y color components are within a specified dynamic range for the m+1-th through n-th output color components;
• and
• compensating at least one of the intermediate color components of the R, G, and B color components and at least one of the scaled intermediate color components of the C, M, and Y color components based on at least one of a small color component and a large color component of the scaled intermediate color components based on a result of the analyzing and consideration of a dynamic range of the m+1-th through n-th intermediate color components being different from a dynamic range of the first through m-th input color components.