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36-Patch Dynamic Range Test Chart

36-Patch Dynamic Range Test Chart Instructions Operating Manual 36-Patch Dynamic Range Test Chart PDF
This 36-Patch Dynamic Range Test Chart Instrument are Certified with
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1 Years Warranty (Additional support period of 3 years)

This chart has 36 low-noise density patches with density steps of approximately 0.1, for a density range of at least 3.2 (density from base to base + 3.1 minimum). A nearly circular patch arrangement ensures that vignetting has minimal effect on results.  A CSV reference file with actual densities will be supplied.  The chart has an active area of 197x235 mm (7.75x9.25 inches) on 203x254 mm (8x10 inch) film.

It also contains slanted edges in the center and corners 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. Registration marks make the regions easy to select. A neutral gray background helps ensure that the chart will be well-exposed in auto exposure cameras (compared to charts with black backgrounds, which are sometimes strongly overexposed).

It is supported by Stepchart, Multicharts, Multitest and can be used with the Dynamic Range postprocessor if several manual exposures are available. Dmax >= 3.4 is sufficient for camera phones and digital cameras with small pixel sizes, but high-end DSLRs generally have higher dynamic ranges (and also manual exposure), which makes them well suited for Dynamic Range.

This chart is produced with a high-precision LVT film recording process for the best possible density range, low noise, and fine detail.

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FAQs About  Dynamic Range Charts

Inconsistent results from a haze meter can stem from issues like calibration, dusty haze meter optics, inadequate power supply, and improper measurement technique. If you have any questions, you can contact our Haze measurement experts


D/8° and 45°/0° are two different illumination methods with distinct optical geometries. The D/8° illumination is suitable for general industries, and delivers better performance in color difference comparison and color measurement especially for high-gloss products. For the packaging and printing industry, the 45°/0° illumination is recommended.

D/8° (Diffuse / 8° viewing)

Recommended for:

  • Plastic, paint, ink, ceramic, textile, coating

  • Samples with metallic luster, pearlescent, glitter, or texture

  • Situations requiring consistent data with laboratory spectrophotometers

  • Applications needing SCI (including specular reflection) / SCE (excluding specular reflection) switching


45°/0° (45° annular illumination / 0° viewing)

Recommended for:

  • Printing, packaging, paper, ink, matte non-metallic materials

  • Products focusing on human eye direct visual matching

  • Standard color matching in printing & packaging industry


Simple Selection Guide

  • With metallic/pearlescent/glitter effect → choose D/8°

  • Printing, paper, packaging, matte products → choose 45°/0°

  • Want universal use for multiple materials → choose D/8°


Haze captures the scattering of light, transmittance measures the light that passes through a said material.


The repeatability is an important parameter for the accuracy of the colorimeter. Threenh Technology portable colorimeter for color measurements tandard deviation ΔE*ab is within 0.03 (Measurement condition: the average value of 30 measurements on the white board at an interval of 3s after calibration). Each colorimeter can pass the qualified inspection before leaving the factory to ensure it conforms to the standard of China Metrology Institute.

The photoelectric integral color‑measuring instrument is what we commonly refer to as a photoelectric colorimeter. It obtains color tristimulus values through one‑shot integral measurement, featuring fast measurement speed and low cost, yet its absolute accuracy is inferior to that of a spectrophotometer. It works well for quick color‑difference comparison. For sophisticated color analysis or color formulation, a spectrophotometer is recommended instead.

How it converts color into digital values

At its core, this type of instrument simulates human color vision. Filters work together with detectors to convert optical signals into electrical signals and then calculate numerical values.

  1. Light strikes the sample, and reflected light enters the instrument.

  2. Filters split the light into three channels: red, green and blue, corresponding to three photodetectors respectively.

  3. Detectors measure the light intensity of each channel. The instrument directly computes tristimulus values X, Y, Z as well as chromaticity coordinates.

  4. The matching performance of optical filters is critical. Better compliance with the Luther condition delivers higher measurement accuracy.

Differences from spectrophotometers

Both instruments measure color, yet they serve quite different application scenarios.

Photoelectric colorimeter: Simple structure, compact size and easy operation with fast measurement speed. It can only test color difference instead of spectrum, and its absolute accuracy is limited, with chromaticity‑coordinate error around ±0.03.

Spectrophotometer: Light is dispersed and measured wavelength‑by‑wavelength. It provides high accuracy (chromaticity‑coordinate error up to ±0.001‑±0.003) and can acquire spectral reflectance curves. However, it comes with higher cost, complicated structure and relatively slower measurement speed.

Suitable application scenarios

Photoelectric colorimeters are preferred for routine production inspection, quick comparison and cost‑sensitive projects.

  • Textile printing & dyeing: Rapid color matching and color‑difference comparison

  • Plastics, coatings and printing: Spot‑checking color consistency on production lines

  • Field‑testing scenarios: Handheld models support on‑site measurement

  • Budget‑limited projects: Photoelectric colorimeters are cost‑effective with sufficient practical functions


In industrial production and quality control, color consistency is one of the core elements determining product quality. Whether it is the metallic paint for automobile coating, the dyeing effect of textile fabrics, or the ink matching in packaging and printing, subtle color deviations may lead to cost waste or damage to brand image.

The LAB color space defines colors with a three-dimensional model:

  1. Lightness (L): It indicates the lightness or darkness of a color, ranging from 0 (pure black) to 100 (pure white).

  2. Hue and Saturation (a and b):

    • The a-axis represents the red-green tendency, with positive values leaning towards red and negative values leaning towards green;

    • The b-axis represents the yellow-blue tendency, with positive values leaning towards yellow and negative values leaning towards blue.

It is a globally recognized standard and supported by most modern color measurement equipment. Color is quantitatively analyzed by measuring Lab values with instruments.


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