The GretagMacbeth MINI Color Checker is a color measurement tool that produces average differences of color values. We used a sample size of ten shade tabs and eight color patches, with a random order, and averaged the results. The differences were 0.78 and 0.43 respectively. In both color spaces, the difference between measured and manufacturer’s data was higher for the PRM2-11 model.
Luminosity sensor’s sensitivity measured at 595 nits
The Luminosity sensor is typically used to measure the amount of light a light source can detect. This sensitivity is commonly referred to as the luminosity function, and there are two types: photopic (black) and scotopic (green). Both types of luminous efficiency curves have their own sets of thresholds, and the horizontal axis represents wavelength in nm.
The luminosity metric is particularly useful for measuring grid cell outputs and country outputs, since it has approximately the same information content as the other types of data. In countries where conventional economic data is scarce and subnational data is unreliable, this type of metric can help fill in these gaps.
Color temperature measured with Mini Color Checker
Color temperature is a measure of the color of light. It’s measured in degrees Kelvin. Color temperatures range from 1700K (very warm) to 9500K (very cool). Color temperatures can also be used in determining the whiteness of a photograph. The following chart shows common light sources and their respective Kelvin values. Higher Kelvin values correspond to cooler color tones.
The original ColorChecker chart was first developed in 1976. ColorChecker’s chart was available in letter-size and a smaller, compact version, called “Mini.” There were additional patches for specific uses. The colors of the Mini Color Checker are accurate to about a third of a degree.
The Mini Color Checker uses the same color charts as the original ColorChecker. The 24 chart patches are similar to the original ColorChecker’s. These patches are laid out in the same layout as the original ColorChecker. The remaining 44 patches are neutral patches that are designed to evaluate the uniformity of light Color Temperature and Illuminance over the target. The fourteen skin tone patches were added to extend the color gamut.
Color temperature is measured in degrees Kelvin (K). It describes the appearance of light in the human eye. In degrees Kelvin (K), the colors are warm, while the opposite is cold. Consequently, a 2700K incandescent bulb will be hotter than an equivalent-wattage LED bulb.
ColorChecker’s exposure error is calculated by comparing the measured pixel levels to reference levels. To calculate the exposure error, select one of the three color reference levels, namely DC*ab(corr) or DC*2000(corr). In addition, color temperature is calculated using RMS and mean values. The RMS value gives more weight to larger errors.
Color accuracy measured with Mini Color Checker
The Mini Color Checker is a portable device that measures the color accuracy of digital images. The device measures color accuracy in all visible spectrums. It features 24 scientifically prepared colored squares that reflect light from various sources. These squares are accurate enough to represent the colors of natural objects under different types of illumination and color reproduction processes.
In a device that measures color accuracy, the values of the color difference are displayed in a graphical display. The graphical representations are in the form of CIELAB color space. The scales for color difference are arranged on the a*b plane, which is the blue-yellow axis. Squares correspond to ideal values while circles represent measured values. Numbers near the squares refer to color checker patches. For instance, the top row shows patches numbered one to six, and the second row contains patches numbered seven to twelve.
ColorChecker is a good way to test a camera’s spectral range, since it compares two color samples to determine Delta-E (difference between two colors). It is also an effective way to test and confirm the color output. Nix QC Color Sensor is also an excellent tool for color quality control.
The Mini Color Checker is an accurate and inexpensive tool to measure the color accuracy of your digital camera. It has been used to assess color reproduction since the 1960s. Its accuracy is also widely accepted, as the results of this tool are published by manufacturers of digital cameras. In this study, GretagMacbeth has compared the Mini Color Checker data to data published by other companies. The manufacturers’ mean color difference was then calculated and compared to the Mini Color Checker data. It is important to remember that the color differences reported in this section are most likely caused by the accuracy of the instrument itself, not by inaccuracies in the camera.
X-Rite offers two versions of the ColorChecker, the Mini and the Classic. The Mini is the smaller version of the original ColorChecker chart, designed for portability. They both include the software and hardware for testing and measuring color. The Mini Color Checker is sold separately and in bundles with other ColorChecker hardware and software. For specialized use, you can also purchase the Mini Color Checker Digital SG.
The Mini Color Checker has two modes: manually selecting the patch squares or using the Color/Tone Interactive method. In both modes, you can use the ColorChecker to create color profiles for digital cameras. The Classic is better suited for this task, but the Mini can be used close to the camera. The ColorChecker comes with an instruction sheet that contains the numeric RGB values of the different colors.
The ColorChecker also helps photographers make global corrections when editing photos. The test targets are created under similar lighting conditions as those in the images, making it easy to see the impact of the changes before making the changes to the photos. This way, you can avoid costly mistakes and trial-and-error color adjustments that often lead to wrong color reproduction.