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Standard SFRplus Chart

Standard SFRplus Chart Instructions Operating Manual Standard SFRplus Chart PDF
This Standard SFRplus Chart Instrument are Certified with
certify
1 Years Warranty (Additional support period of 3 years)

The SFRplus test chart can be used with the SFRplus module in Imatest 3.2 or later to measure MTF, lateral chromatic aberration, distortion, tonal response, and color accuracy. The SFRplus module features fully automated region-of-interest detection. The SFRplus chart offers significant advantages over commonly used charts such as the ISO 12233 chart, including 1) much less wasted area, 2) the ability to produce a map of sharpness over the sensor surface, 3) better measurement accuracy due to the lower contrast, and 4) full support for automated testing.

This chart is recommended for most standard testing setups and devices. Choose a size based on your sensor and setup limitations.


Options include:

  • Grid: 5x9 grids are recommended for for typical DSLR formats with aspect ratios of 3:2
  • Paper Size and Active Area Options

    This chart is available in three sizes. It is recommended that the medium sized charts be used to test imaging systems with sensors up to 12 MP, the large charts be used for testing of sensors up to approximately 24 MP, and the extra-large charts be used for sensor sizes above 24 MP.

    Paper Size (Including Margin)

      5x9
    Medium 24
    Large 44
    X-Large 44

    Active Area

    The active area of the chart includes white space above and below the top and bottom distortion bars. It is slightly larger than the printed area, which is bounded by the distortion bars on top and bottom. White space is included in active area because test images of the chart must include this white space in order to enable automated processing in SFRplus software.

      5x9
    Medium 22
    Large 33
    X-Large 42
  • Paper/ink type: Matte paper/ink can be used to reduce reflected light and allow for easier lighting setups
  • Contrast levels: 4:1 contrast ratio for new ISO standard compliance
  • Color chart: a 20 patch color chart.

Our Valued Clients

  • our customer TRANSSION
  • our customer xiaomi
  • our customer asus
  • our customer SEMCO
  • our customer sunny optical
  • our customer q tech smart vision
  • our customer Largan Precision
  • our customer o film

FAQs About  SFRPlus Test Charts

Set the 3nh booth in a tidy, stable position with neutral, clean surroundings, adequate airflow, and a reliable power source, and position it away from direct sunlight or mirrors. 


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.


A visual colorimeter is a type of colorimeter that uses the human eye to compare the color depth of a sample with that of a standard solution for semi-quantitative or quantitative analysis of substances. This method is commonly used for quick, rough evaluations in industries such as petroleum, transparent liquids, varnishes, chemicals and printing, as well as for visual color grading in quality control. Its working principle is to compare the sample with a standard and provide visual color measurement results, rather than relying on electronic sensors.

Visual Colorimeters vs. Photoelectric Colorimeters

Visual colorimeters rely on human eye observation, whereas photoelectric colorimeters use sensors to deliver higher precision, complete the measurement automatically through electronic circuits, less subjective color measurement and faster results. They are generally more suitable for rapid, on-line or portable color difference measurement.

Working principle of a photoelectric colorimeter

A light source emits light at specific wavelengths, which interacts with the object surface through reflection and transmission. The light is reflected or absorbed by the sample, and the reflected light or remaining transmitted light is received by a photoelectric sensor (photocell or photodiode). The instrument converts the light intensity signal into an electrical signal, thereby measuring the LAB color values of the sample.

3nh Photoelectric Colorimeter – A Trusted Brand in the Color Measurement Industry

Featuring ultra-high precision, user-friendly interface, light positioning function, high-capacity lithium-ion battery, and multiple optional measurement angles.



For premier glass quality grading (color, transmittance, haze, coating uniformity, architectural/auto/optical glass), the top 3nh & industry-leading instruments are:


1. 3nh YS6060 Benchtop (Best Lab Accuracy)

  • d/8° integrating sphere, 360–780nm, UV adjustable

  • Dual mode: reflectance + transmission

  • ΔE*ab ≤ 0.015, IIA ≤ 0.2, haze measurement

  • Multi-apertures (Φ4/8/15/25.4mm)

  • Ideal: colored glass, coated glass, optical glass, lab R&D


2. 3nh TS8560 Benchtop (Ultra-High Precision)

  • d/8° sphere, SCI/SCE, UV control

  • ΔE*ab ≤ 0.01 (repeatability)

  • Large transmission compartment

    Best for: high-end architectural glass, Low-E coated glass



3. 3nh ST70 Portable (Production/Field)

  • d/8° (SCI/SCE), ΔE*ab ≤ 0.02

  • Handheld, fast, non-destructive

    Best for: line checks, incoming glass, on-site grading



4. 3nh NS810 Portable (Cost-Effective)

  • 45/0 geometry, ΔE*ab ≤ 0.04

  • Touchscreen, rugged

  • Best for: solid-color glass, routine QC

Short Recommendation

  • Top lab: YS6060

  • Ultra-precision: TS8560

  • Portable production: ST70

  • Economical QC: NS810

All measure color consistency, transmittance, haze & coating uniformity for glass quality grading.


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


Because of its unmatched precision, ease of use, adherence to global standards, and consistent long-term reliability.


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