The 11-Step Grayscale Card

The 11-step grayscale card is a professional imaging testing tool primarily used to evaluate the grayscale reproduction capability of cameras. It assesses the fineness of the image's light and dark levels through 11 different brightness levels ranging from pure white to pure black. The common NHK standard gamma value is 0.45. It can also be equipped with blue, yellow, and red color blocks to assist in testing color saturation.
1. Core specifications
It is divided into two types: transmissive and reflective. The mainstream effective size is 240×180mm, and some models are compatible with 16:9 or 4:3 aspect ratios.
The transmittance/reflectance of grayscale is distributed on a logarithmic scale, with a contrast range up to 40:1, which complies with industry standards such as ITU BT.709. It enables cameras that have undergone standard gamma correction to output linear step signals.
2. Main purposes
It can be used to test key imaging parameters such as camera metering accuracy, camera gamma characteristics, white balance, and dynamic range. It is widely applied in factory calibration and performance testing scenarios for surveillance equipment and photographic and video equipment.

Dongguan Dafan Optical Technology Co., Ltd. (DFOPTIX) was founded in 2018 and is headquartered in Dongguan, Guangdong Province, China. DFOPTIX is a system-level calibration solutions service provider, driven by an engineering-centric culture and a core focus on technological innovation.

Currently, DFOPTIX has over 150 employees,with R&D personnel consistently accounting for over 30% of the workforce each year — a professional team combining deep engineering expertise with sustained innovation capability and a capacity for continuous innovation, ensuring robust technical support for high-precision calibration services.

Driven by technology and continuous innovation, DFOPTIX is committed to advancing industrial innovation.The company has established a state-of-the-art R&D and manufacturing base spanning nearly 20,000 square meters,equipped with high-standard precision workshops such as class-100 lithography workshop and class-1000 vacuum lamination workshop, as well as various well-equipped professional laboratories.DFOPTIX has also introduced internationally advanced manufacturing and testing equipment, systematically establishing an industry-leading R&D and manufacturing system.

DFOPTIX is a National High-Tech Enterprise,specializing in high-precision calibration, it focuses on the R&D and manufacturing of a comprehensive range of calibration products, such as integrated light-source calibration targets and radar calibration targets. The Company provides customers with customized calibration products, software and algorithm support, and full-scenario calibration solutions. Its products and solutions are widely applied across sectors including medical technology, semiconductors, robotics, consumer electronics, intelligent automotive, aerospace, 3D scanning, and industrial automation.

After years of rapid growth and technological development, DFOPTIX has emerged as a leading provider of system-level calibration solutions, serving more than 3,000 corporate customers worldwide, including multiple Fortune 500 companies.

Looking ahead, DFOPTIX will continue to uphold its core values of “Precision as the Foundation, Technological Innovation, Pursuit of Excellence, and Mutual Success.” The company will further advance technological innovation, continuously enhance its calibration technologies, and expand its software and algorithm ecosystem. By delivering increasingly precise, reliable, and systematic calibration solutions, DFOPTIX aims to forge lasting partnerships and work together with industry partners to shape the future of the industry.