Hi Brian,
In MATLAB, you can use the Color Matching Functions (CMFs) and the makecform function to build a custom ICC profile for an RGB printer. However, it's important to note that creating a complete ICC profile requires a deep understanding of color management principles and the ICC specification.
To build a custom ICC profile using your own RGB-to-XYZ data, you can follow these steps:
- Prepare your RGB and XYZ measurement data in Nx3 arrays.
- Normalize the RGB and XYZ values to the range [0, 1].
- Define the color space transformation using the RGB and XYZ data. This involves creating a custom color transformation structure.
- Use the 'makecform' function to create a custom color transform function based on the defined color transformation structure.
- Apply the custom color transform function to your RGB data to obtain the corresponding XYZ values.
- Use the generated XYZ data to build the ICC profile.
Here is an example code:
% Step 1: Prepare RGB and XYZ data
RGB = ... % Nx3 array of RGB values
XYZ = ... % Nx3 array of corresponding XYZ values
% Step 2: Normalize the RGB and XYZ values
RGB = RGB / 255; % Normalize RGB values to [0, 1]
XYZ = XYZ / max(XYZ(:)); % Normalize XYZ values to [0, 1]
% Step 3: Define the color transformation structure
colorTransform = makecform('custom', 'Type', 'xyz', 'ColorSpace', 'linear', 'WhitePoint', 'd65', 'AdaptedWhitePoint', XYZ(1,:));
% Step 4: Create custom color transform function
customTransform = @(x) applycform(x, colorTransform);
% Step 5: Apply custom color transform to RGB data
transformedXYZ = customTransform(RGB);
% Step 6: Build ICC profile using transformed XYZ data
Hope it helps!
