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24-color test card

24-color test card

Brand: Sine Image
Size: 21.59 * 27.94cm
Material: HD Photo Paper Type: Reflective
Free consultation: 400-666-2522
  • product description
  • Specifications
  • related software

24 color test card

24-color standard color card, including six levels of gray patches, plus three primary colors (red, green, blue), subtractive three primary colors (yellow, magenta, cyan), and skin colors and real colors that simulate natural objects. A solid color block, labeled from 1 to 24, from left to right and then from top to bottom. So it is called 24 color card. For the test of camera color and white balance, we used the standard color card ColorChecker to shoot in different environments and use the corresponding white balance mode to compare. Their white balance accuracy.

24 color test card application area

Digital camera: check the color reproduction of the camera, lens and optical system, digital camera image color correction, contrast test target white balance, and reproduce true colors in the color reproduction system
Video: Check the color reproduction of the camera and its optical system and the color reproduction of the projection system.
Graphic design industry: inspect any printing and proofing process, inspect films, lights, filters and paper.
Electronic publishing industry: detection of color reproduction of scanners, displays, monitors.

x-rite 24 color test card

Function description

The white balance has 6 modes including automatic white balance, daylight white balance, shadow white balance, tungsten white balance, fluorescent white balance, and manual white balance. The standard plate has 24 solid color blocks, which are labeled 1-24 from left to right and then from top to bottom.

24 color test card specifications

Size: 8.25 * 11 inches (21.59 * 27.94 cm)
Color types: 24 types, including natural object colors, colors, primary colors and grayscale colors.

24 color test card usage

Colorchecker can truly restore colors under any lighting. Your first shot is the ColorChecker standard color card. The specific steps are as follows:

When using the ColorChecker color card to restore the color of an image, only the composition and lighting need to be performed normally. Then put the ColorChecker color card on the scene. It does not need to fill the viewfinder. Just make sure the camera can capture all the color patches. And it is located in a representative part of the composition instead of in the shadow or in the overexposed highlight position, you can additionally check that the colors reflected by other objects have not been cast on the color card, and then take a picture when the image is in When opened in Photoshop, there is a built-in reference point. Use the color picker to sample the black blocks. The difference between red, green, and blue should be within 7 units, and the color value should be about 50. Although the black patch is very dark, it is not considered pure black because it is a matte color. The same procedure is performed for the white blocks. The white blocks should be very light, but not pure white, and their red, green, and blue values should each be about 245. The work is almost done. Finally, we need to check the color shift and select the middle gray block. The red, green, and blue values should be about 128. The difference between each other should not exceed 7 points. If the readings deviate significantly, apply the level or curve to return to the above state. Then save the changed settings for use in other images taken with this setting. Further visual color matching can be performed with the remaining color patches. Note: A calibrated display should be used and the ColorChecker color card should be placed under a standard light source that can control lighting conditions.

Can be used with professional software such as PM5 to generate ICC files belonging to the camera itself. Specific steps refer to the relevant information. Only some of the requirements for PM5 are provided below.

1. When shooting a color card under natural and controlled light, pay attention to adjusting the appropriate angle, do not let the light directly reflect through the color card into the lens, and do not let the color reflected by other objects cast on the color card, so It may cause a large deviation, and make PM5 make a larger error when calculating icc;

2. Use manual and accurate white balance as much as possible to lock the white balance. Grey balance card, white balance card, etc. can be used.

3. The exposure should be well controlled. You can open the histogram for observation and adjust the exposure compensation. Note that it is ideal to make the color value of the white block between 210-245. As for the requirements of black blocks, you can ignore them, because for models with larger tolerances, when the white blocks reach a measurement of 210-245, the black blocks are unlikely to be less than 23. Small machines make it easy. The significance here is actually to control the exposure as much as possible so that the color blocks in the color card reach the ideal white and black points.

4. When shooting, set all the settings about contrast and color in the machine to the default values, and be careful not to set the sharpening option. This will also affect the color of the color card.

5. To ensure that the light on the surface of the color card is evenly distributed, and do not appear half-bright and half-dark, it is recommended to use dual light sources to illuminate the color card at 45 ° from left and right.

We used the standard color card ColorChecker to shoot in different environments using the corresponding white balance mode for comparison. On the one hand, we can observe the reproduction of various colors by the models, and on the other hand, we can observe their white balance accuracy. The white balance has 6 modes including automatic white balance, daylight white balance, shadow white balance, tungsten white balance, fluorescent white balance, and manual white balance. The standard plate has 24 solid color blocks, which are labeled 1-24 from left to right and then from top to bottom. If distinguished according to RGB, the RGB component values of each color block are:

Serial number Color Block Name R G B
1 Dark Skin 94 28 13
2 Light Skin 241 149 108
3 Bolu Sky 97 119 171
4 Foliage 90 103 39
5 Blue Flower 164 131 196
6 Bluish Green 140 253 153
7 Orage 255 116 twenty one
8 Purplish Blue 7 47 122
9 Moderate Red 222 29 42
10 Purple 69 0 68
11 Yellowe green 187 255 19
12 Orange Yellow 255 142 0

Serial number Color Block Name R G B
1 Blue 0 0 142
2 Green 64 173 38
3 Red 203 0 0
4 Yellow 255 217 0
5 Magenta 207 3 124
6 Cyan 0 148 189
7 White (.05) * 255 255 255
8 Neutral 8 (.23) * 249 249 249
9 Neutral 6.5 (.44) * 180 180 180
10 Neutral 5 (.70) * 117 117 117
11 Neutral 3.5 (1.05) * 53 53 53
12 Black (1.5) * 0 0 0
* Indicates optical density

Part One: 3NH Official Download

Part 2: Download the full range of color card electronic versions

Part III: Download of 3nh instrument instruction manual

Part 1: 3NH official download

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NH300 USB driver download (USB driver NH300) (This driver may be misidentified as a virus by anti-virus software, please rest assured to download!)

NH310 64-bit USB driver download (X64 USB driver NH310) (This driver may be misidentified as a virus by antivirus software, please rest assured to download!)

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Part 2: Download the full range of color card electronic versions

TCX Color Card Online Version: http://shop.3nh.com/product-203.html

TPX color card online version: http://shop.3nh.com/product-202.html

TPX color card 175 new colors online version: http://www.3nh.com/news/45.html

CU Color Card Online Version: http://www.3nh.com/news/47.html

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(If your computer cannot extract the installation and download version, please check the online version directly)

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Part III: Download of 3nh instrument instruction manual

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