Part of the ICC file

The ICC profile typically consists of a file header, a tag table, and tag element data.

The file header occupies a total of 128 bytes, mainly describes the file attributes, such as the characteristics of the file type, capacity, version number, color management module type, device color space, feature file connection space (PCS), color matching, PCS space The tristimulus value XYZ of the light source.

The label table mainly includes the total number of labels in the property file and the description of each label. The total number of tags occupies 4 bytes; each tag description occupies 12 bytes, the first 4 bytes are tag identifiers, and the middle 4 bytes is the offset of the tag relative to the start byte of the property file. The 4 bytes are the length of the tag element data. The tag element data is mainly used to store the conversion data between the device's color space and the PCS. The capacity of each tag element is different.

The display profile is actually very complex, they can be a series of tables, or a table followed by a matrix. Then followed by a table, the result seems to be a big table. The various types of profiles are the same.

Most display profiles are table-types of matrix tables. Printer profiles are a series of table types. However, these differences are almost irrelevant to users. The main difference is that all display profiles are from RGB to PCS, and many printer profiles are from PCS to CMYK (ie, 4 channels compared to 3 channels). However, many printers require RGB data to be converted into CMYK in their driver, so that the printer profile has only 3 channels.