US Lennon gray card exposure level is accurately detect the reference rich layers, color-saturated photos from accurate exposure. If you shoot a scene of light is too bright or too dark, it could lead exposure deviation.
US Lennon gray card capable of complex light scenes will be balanced at 18% neutral gray; by reflecting light meter will record the light gray card; you can get accurate exposure values!
US Lennon gray card through a handheld light meter, TTL SLR cameras, digital cameras and camera beside the shaft with measured exposure metering values taken using US Lennon gray card is taken to ensure high-quality photos, the photographer must Preparation tool!
Gray card CD content:
1, gray card use manual;
2, the technical characteristics of the gray card;
3, gray card and digital photography;
4, gray card and color balance;
5, gray card of practical DC
18% gray plate used in photography:
The gray board to position the subject so that the light (natural or artificial light) and a digital camera from the same direction, the white balance is set manual white balance position, and select the calibration function, adjust the focus ring against gray panels to infinity, adjust the distance or zoom the ash plate occupy the entire screen, press the shutter to take a picture out of focus, select ok you can get the real balance. As long as no major changes in ambient light, the next shot will be the right white Record true color balance. When the ambient light changes when you can re-adjust the white balance. gray card compact, inexpensive, easy to carry, it is recommended as oak out photography Friends necessary configuration.
It should be noted that the use of drywall taken measured color is the true color of the scene recorded. If you use the natural light shooting, NA me it reflects the color temperature of the color must be natural light. If the use of artificial light shooting NA me it reflects the color must be the color temperature of the artificial light. Simply put, the use of gray board reduction is the true color of the scene, it does not force a change in the color temperature of the light scene! And late ps adjust the white balance will certainly change the scene the color temperature of the light, resulting in distortion field lighting atmosphere.
Gray Card Caution
Try to put the card near the body
Avoid reflective card facing the camera
For the main body of the plane (for example remake), with the body parallel to the gray card should preferably be placed directly on top of the body.
When shooting three-dimensional object, the gray card for the middle of the angle of the main light and camera, to avoid the card facing the camera reflection.
Lens along the optical axis direction toward the gray card measuring reflected light.
If the subject is very light, according to the measured exposure readings minus 1EV
If the subject is very dark, according to the measured exposure readings plus 1EV
If the body part is very light or dark, do not use this metering method using multiple measurement points reading more appropriate.
Significance of standard gray plate
Even the best light meter, exposure can not really solve the problem, because it is just a tool no critical thinking skills. Shiyao value in accordance with the exposure to the meter reading is actually a photographer as a basis for a comprehensive analysis of the results in the analysis A standard gray panels' meaning is very important.
Snow reflection rate of about 98%, black velvet at around 2%, both living in the middle of the reflection rate of 125% of ash, while the so-called 'standard gray plate' is the reflection rate of around 12.5% of ash board, but 18% of the most symbolic, because people think that the reflection rate and face similar standard gray of great significance in photographic equipment and photosensitive material production. In light meter, for example, the illuminance meter Table and luminance difference meter, if the angle from the standard gray panels to understand, the problem will become much simpler.
In reading illumination table of exposure, not only the subject in 18% of the ash will get real reduction, other equally available to different brightness of the scene more realistic reduction, shooting according to the meter reading of the table, will get 'black is black and white white 'effect. illumination angle table is actually the subject matter, measuring illuminance of the light source. In terms of brightness meter readings exposure would mean, regardless of the subject (analyte) is black coal or snow, The end result will be reduced to 18% of ash. brightness table is actually a photographer's point of view, in measuring the brightness of the subject matter. illumination table and
Is irrelevant subject of reflectivity, it is whether you shoot snow or coal, meter reading are the same.
In considering the illumination brightness table is also considered to be the subject of reflectivity under the same lighting conditions, the measured coal and snow readings will be different. Luminance table and illumination table is different, from the principle that only thorough understand their characteristics, in order to make better use of it.
Meter brightness table mostly within the camera, in many cases, it's meter reading just for us to determine the actual exposure values provide a reference, rather than the actual exposure value. The actual exposure value is expected according to the shooting photographer effects and circumstances are subject to meter reading based on the analysis come through. And the analysis point, 'Whatever the measured object-what, according to the exposure metering readings obtained will be around 18% neutral gray '. In this connection, if you do not want to make the snow becomes' gray snow ', it must increase the amount of exposure. If you have a hands-point meter (also a brightness table), and want according to Adams' exposure area theory 'to analyze determine the actual amount of exposure, the same should revert to the measured points to 18% of ash for the analysis point, if more tolerance and film and photographic paper taking into account for the final result will be shooting with confidence.
If you want to make the brightness table within the camera has a function of illumination table, as long as there is a 18% gray board basically can do; because the standard gray plate on the object and the subject under the same lighting conditions, the Gray Card The value obtained is basically table illuminance values measured.
In fact, to understand the significance of the standard gray plate far beyond the exposure control more arbitrary, equally significant in understanding the performance of the photosensitive material and post-production.