11 Step Grayscale Test Chart Transmissive & Reflective Types Gray Scale Card

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, its headquarters located in Dongguan City, Guangdong Province, China. DFOPIX is a system-level calibration solutions service provider with engineering culture as its cornerstone and technological innovation as its core.

Currently, DFOPTIX has nearly 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. DFOPTIX has established an advanced 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. It has also introduced internationally advanced manufacturing and testing equipment, systematically establishing an industry-leading R&D and manufacturing system.

DFOPTIX specializes in the R&D and manufacturing of a full category of calibration products — including integrated light-source calibration targets and LiDAR calibration boards, while also providing customized calibration product services tailored to customers’ requirements. To date, our company's products and solutions have been widely deployed across sectors including medical, semiconductor, robotics, consumer electronics, intelligent vehicles, aerospace, 3D scanning, and industrial automation. DFOPTIX has served over 3,000 clients, including several Fortune 500 companies.