CHNSpec Technology （Zhejiang）Co.,Ltd chnspec@colorspec.cn 86--13732210605
The CMYK values measured by the spectrophotometer are different from those in Photoshop.
Here are the main differences between them:
Measurement method: A spectrophotometer is a physical device that determines color information by measuring the absorption and reflection of light. It can directly measure the color of an object's surface and convert it into CMYK values. In Photoshop, CMYK is calculated based on the color model and algorithm.
Color space: Spectrophotometers typically use actual physical color spaces, such as the CIE Lab color space or other standard color spaces. The CMYK values provided by them are relative to these color spaces. While in Photoshop, CMYK is based on its internal color management system and color profile, and usually uses device-dependent color spaces.
Calibration and profile: A spectrophotometer needs to be calibrated and configured to ensure accurate color measurement. It usually requires reference to a standard color chart or calibration target. In Photoshop, CMYK can be converted and displayed based on the color profile selected by the user.
Color accuracy: A spectrophotometer theoretically can offer higher color accuracy because it directly measures the physical properties of colors. The CMYK conversion in Photoshop is usually limited by the color management system and profile, and there may be some color discrepancies.
In summary, the CMYK values measured by the spectrophotometer are based on the actual colors obtained through physical measurement, while the CMYK values in Photoshop are calculated values based on software algorithms and color profiles. Their accuracy and application methods may differ. In the ink printing, packaging, and paper industry, the most commonly used density meters are those from two brands: China's Color Spectrum and the United States' X-Rite (also known as Color iX). The main ones include:
1. X-Rite:eXact Spectrophotometer
2. ColorScan: DS-700C Spectrophotometer
