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White Balance 18% Gray Card Standard Exposure Calibration Photography Focus Board Metering Tool Grayscale Calibration Card
Model: YE0184
Size: Any size below 1600mm in width, no length limit
Material: High-definition photo paper
Type: Reflective
Main functions
1. Determine exposure value;
2. Determine light ratio;
3. Determine color balance and density;
4. Determine exposure for macro and copy photography;
5. Set white balance for the camera;
The 18% Neutral Gray Card is a "ruler" in the photography process, providing an objective standard from pre-shooting to post-processing, and is especially indispensable in the professional field. Mastering its usage skills can significantly improve the exposure accuracy and color reproduction ability of the work.
18% neutral gray card plays a key role in photography and film and television production. Its core functions can be summarized as follows:
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1. Light metering calibration: accurate exposure
- Reflectivity benchmark: 18% gray card reflects about 18% of the incident light, which is close to the average reflectivity of natural scenery (such as green trees, skin, etc.). The camera's light metering system uses this as a standard to calculate exposure parameters.
- Avoid exposure deviation: When shooting high-contrast or large-area pure color scenes (such as snow, black background), the camera may misjudge and cause overexposure or underexposure. Use gray card to manually meter light to ensure accurate exposure of the subject.
2. White balance calibration: color reproduction
- Neutral color reference: Gray card itself has no color tendency and can be used as a white balance benchmark under different light sources (such as daylight, fluorescent light, mixed light). Include gray card when shooting, and correct color temperature by sampling in the later stage to eliminate color cast.
- Complex lighting response: Especially in commercial photography or film and television, ensure color consistency in multiple scenes or continuous shooting.
3. Post-processing reference
- Color correction: Use gray cards to establish color standards and correct color deviations caused by ambient light or equipment differences.
- Contrast and dynamic range: Check whether the light and dark details of the picture are lost, and use the gray card midtone as a reference when adjusting the curve or histogram.
- Brightness standard: Determine the exact position of the image midtone to assist in adjusting the overall tone.
4. Technical principles and usage tips
- Why 18%? The human eye perceives brightness in a logarithmic relationship, and 18% reflectivity is close to the visual "middle gray" (not 50% reflectivity). This standard originated from the photosensitivity of the film era and is still used today.
- Correct usage:
- Place the gray card at the position of the subject to ensure consistent lighting.
- Fill the frame to avoid interference from reflections or shadows.
- Use manual mode first when shooting, and lock the parameters after measuring the gray card.
- Compatibility: Almost all camera metering systems are based on 18% gray by default, but different metering modes (such as spot metering and matrix metering) require targeted adjustment of the gray card usage.
5. Special scene applications
- Film and television lighting debugging: Use gray cards to confirm light uniformity during the lighting stage.
- Multi-camera synchronization: Use the same gray card for calibration of multiple devices to ensure uniform color and exposure.
| item | 18% Neutral Gray Card |
| place of origin | China |
| weight | 100g |
| Type | Reflective |
| Coating | Anti-reflective coating |
| warranty | 1 year |
| customized support | ODM |
| brand name | 3nh/SineImage |
| model number | YE0184 |
| size | 203*254mm |
Guangdong Threenh Technology Co.,Ltd./Shenzhen?Threenh Technology Co.,Ltd.began in?1998, and we have 3 factories, about?15000 square meters, seperately in Guangzhou and?Huizhou of Guangdong Province, and the third one in Jiangxi Province and many offices in China like Shanghai, Shenzhen, Hangzhou, Qinigdao, Beijing, ETC.?We specializes in the R&D, production and sales of colorimeter, spectrophotometer, color density meter, gloss meter, color light box, color proof table, coating thickness gauge, iso test chart, etc., which is the leading producer in the color and glossy surface measurement field in China. We are also the national high technology enterprise.Till now we have received more than 30 patents and passed CE, ISO 9001, ROHS, FCC, TUV etc certifications. We also can support?OEM&ODM service?for free for all over the world customers.
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