New Dynamic Range Test Charts
The Imatest Dynamic Range (ITDR) test charts have three density ranges to suit every need. The charts allow you to measure the tonal response, noise, and dynamic range of various imaging systems with a single image instead of multiple, exposure bracketed images. The targets also contain slanted edges with 4:1 contrast for measuring MTF. The edges have an MTF50 >= 16 cycles/mm, which is about 3 times better than the best inkjet charts. The middle gray background density enables proper exposure with automatic exposure cameras. Dynamic Range test targets with black backgrounds tend to overexpose the brighter patches with auto-exposure cameras.
The chart’s active area of 197 x 235mm is a good fit for both the DNP Standard Color Viewer and ITI LED light box.
Imatest recommends using the Dynamic Range Targets with a high illuminance light source (close to 10,000 Lux) in order to provide sufficient light to test image sensors over their range of sensitivity. These charts are well suited for measuring both camera and sensor dynamic range, which are fundamentally different. Camera DR measurements are affected by flare (stray) light in the lens. They represent real-world performance. Sensor measurements are based on the patch pixel and noise levels in unprocessed RAW images, using the technique described in Multicharts / Multitest / eSFR ISO Noise, which fits data to an equation based on dark and photon noise.
The optional acrylic frame for these targets will allow them to be easily placed and removed from the ITI light box or DNP Viewer.
These targets are available in three different ranges:
ITLDR36 - Low Dynamic Range (50dB) for low dynamic range cameras with small pixels. This target will be ideal for camera phones and tablets. Available with two aspect ratios (4:5 and 16:9)
ITWDR36 - Wide Dynamic Range (100dB) for most high quality cameras, DSLRs, larger mirrorless cameras (Micro 3/4, APS-C, etc.) and any high quality camera that is not specifically "HDR".
ITUHDR36 - Ultra High Dynamic Range (150dB) is designed specifically for HDR cameras.