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SFRplus Chart: Inkjet on Paper - 10:1 & 2:1 Contrast Ratio

SFRplus Chart: Inkjet on Paper - 10:1 & 2:1 Contrast Ratio Instructions Operating Manual SFRplus Chart: Inkjet on Paper - 10:1 & 2:1 Contrast Ratio PDF
This SFRplus Chart: Inkjet on Paper - 10:1 & 2:1 Contrast Ratio Instrument are Certified with
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1 Years Warranty (Additional support period of 3 years)

Contrast Ratio Options

  • 10:1 and 2:1 contrast ratios  Use of both contrast levels improves ability to analyze non-linear signal processing, which may not affect the lower contrast 2:1 contrast ratio regions 
  • 10:1 contrast only improves the completeness of 3D maps of performance across the imaging surface.
  • 4:1 contrast ratio matches the upcoming new ISO-12233 specs.  Click here for our 4:1 contrast ratio SFRplus test charts

Paper Type - Semi-gloss or Matte Options

  • Matte paper can be easier to light because it has less specular reflection than the semi-gloss paper.  The MTF is slightly less than semi-gloss paper and does not have as deep dark tones on the stepchart.
  • Semi-gloss paper has slightly higher detail than matte, has deeper black tones on the stepchart, and is recommended for most applications except for wide-angle lenses.

Square Grid Dimension Options

  • 5x9 grid dimension is recommended for for typical DSLR formats with aspect ratios of 3:2 and typical HDTV formats with aspect ratios of 16:9.
  • 5x7 grid dimension  is recommended for typical compact camera formats with aspect ratios of 4:3.

Ink Jet Chart Resolution

This chart, and all our ink jet printed charts have an approximate MTF50 of 5 cycles/mm.  Please keep this in mind when choosing the size of chart.  Using a chart that is too small with a high-resolution sensor can result in the MTF of the chart degrading the measured MTF of the camera system. In addition, it is important to use a chart that is large enough to accomodate the minimum focus distance, as well as the resultion of your sensor. 

Paper Size and Active Area Options

Charts are available in tfive main sizes with variations depending on the grid dimensions selected. 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 above 12 MP and up to approximately 24 MP, and the extra-large charts be used for sensor sizes above 24 MP.

Paper Size (Including Margin)

  Square Dimensions
5x9 5x7
X-Small 8.5" × 15" 8.5" × 10"
Small 14" × 24" 14" × 20"
Medium 24" × 40" 24" × 34"
Large 44" × 60" 44" × 60"
X-Large 44" × 74" 44" × 64"

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.

  Square Dimensions
5x9 5x7
X-Small 7.85" × 15" 6.75" × 10"
Small 12.5" × 24" 13.5" × 20"
Medium 22" × 39.22" 22" × 33"
Large 33" × 59" 40" × 59"
X-Large 42" × 72" 42" × 59"

Color Chart Option

Inclusion of the color chart enables testing of color accuracy. If the color option is selected, the "focus star" pattern that aides in focusing is replaced by a 20 patch color chart.

Pre-Distortion Options

Pre-distorted charts offer the ability to map the outer edges of a wide angle or fisheye lens using SFRplus.  These distortion levels are available

Level Matrix (5x7) Matrix (5x9)
No distortion [0 0] [0 0]
Distort [0.833 1.123] [0.833 1.375]
Distort+ [1.167 1.577] [1.167 1.982]
Ultradistort [1.333  2.313] [1.333 2.958]

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FAQs About  SFRPlus Test Charts

To operate the haze meter, first calibrate the instrument, clean the sample, position it correctly in the holder, and initiate the measurement. The instrument then shows the haze and overall transmittance readings.

a. When the colorimeter is disconnected to the PC, "Connection Timeout" will occur. At the moment, you have to check whether the USB cable is well connected the colorimeter and the PC. Then you can re-plug the USB to try out.

b. After ensuring the colorimeter is connected to the PC with USB cable, turn on the colorimeter and enter the main menu. Select "Comm" and press "Enter" key to start communication.

c. Turn off CQCS3 software, and reopen it.

The main instruments used to detect color are spectrophotometers and colorimeters (including photoelectric integrating colorimeters). 

Spectrophotometer: High-precision option. It analyzes the full visible light spectrum to measure color accurately. Suitable for complex scenarios like textured surfaces, special effect colors, or batch consistency checks in industries such as paint and coatings. 

Colorimeter (Photoelectric Integrating Colorimeter): Cost-effective and portable. It uses RGB filters to measure tristimulus values directly. Ideal for quick color difference detection in simple applications. Key Selection Tip Choose based on accuracy needs: use a spectrophotometer for high-precision color measurement, and a colorimeter for fast, basic color difference checks.


 A gloss test gauges the reflective quality of a surface by casting light at a fixed angle and measuring the amount reflected. It defines the level of shine or dullness of a surface, and it is very crucial in coatings, automotive, and product finishing


A coating thickness gauge measures coating thickness. It measures coating thickness using three different principles: magnetic induction, eddy current, or ultrasonic. Depending on the coating type and the coating's substrate material, the appropriate principle is selected. For industrial and laboratory use, most of these units deliver accurate, non-invasive readings.


When detecting color differences, the first factors to consider when selecting a light source include its stability, directionality, lifespan, and the effectiveness of the ultimately obtained spectral curve. The illuminant of a colorimeter is a fixed bulb, such as a tungsten lamp，LED light or a long-life xenon lamp. However, for the same color sample, the results displayed by the instrument vary under different light sources. This is because different light sources cause different absorption and reflection of light on the sample, leading to differences in how both the human eye and the instrument perceive the color. 

In general, the D65 light source is used in the application of coil steel inks for construction. The D65 light source is equivalent to average daylight. Most coil steel inks for construction are used outdoors, and sunlight is regarded as the standard light source in outdoor environments. For household appliance coil steel inks, due to their usage characteristics, they are mostly used indoors. Therefore, the A standard light source is adopted for color measurement of samples based on indoor lighting conditions. The A light source is a carefully specified tungsten light source. Other light sources, such as fluorescent light sources, can be used in many types of applications. For example, some textile factories use fluorescent light sources. Therefore, a reasonable light source should be selected as the mutually recognized measurement method based on actual usage conditions and user requirements. Once agreed upon by both parties, color measurement must be conducted under the same conditions. This helps reduce unnecessary systematic errors and human errors, achieving the optimal consistency in color measurement. 

The 3nh high-precision spectrophotometric colorimeter adopts a combined LED light source with long lifespan and low power consumption, which includes UV (ultraviolet) and UV-excluded options. This design can meet the color difference detection needs of different users and supports the selection of multiple light source modes.

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