Image processing for color matching before and after lamination printing

An image processing apparatus, comprising:

• a first conversion unit configured to convert an input device color depending on an input device into a first output device color that is an output device color depending on an output device;
• a second conversion unit configured to convert the first output device color into a first spectral reflectance using an output profile showing a relationship between the output device color and a spectral reflectance;
• a third conversion unit configured to convert the first spectral reflectance into a second spectral reflectance, to be reproduced before lamination processing, using a mutual conversion formula of a spectral reflectance before lamination processing and a spectral reflectance after lamination processing;
• and
• a device color calculation unit configured to calculate a second output device color that is an output device color using the second spectral reflectance, the output profile, and light source information.