"Your photos are overexposed! "Is it difficult to correctly judge whether a photo is properly exposed when it is viewed? How to choose the application of exposure compensation and flash compensation in the camera? Listen to how to understand the exposure curve and use exposure or flash compensation to make a good work.
Analysis of Exposure by Curve Map
The three photos were underexposed, normally exposed and overexposed. From the graph, there is overflow on the right side of underexposed photos, overexposed photos on the left side of overexposed photos, and normal exposure photos are more evenly distributed. From the graph we can see which one is excessive and which one is insufficient. Moreover, under-exposed photographs have too dark dark and dark complexion; over-exposed photographs have too bright background and no details at all; but normally exposed photographs have abundant details, high color saturation and strong stereo sense. So it's a good habit to look at curves whenever you shoot.
Exposure compensation and flash compensation
Exposure compensation, also known as EV (exposure value) adjustment. With this function, the automatic exposure set by the camera can be adjusted up or down several levels. Number 0 represents the exposure recommended by the camera. Selection of + values (e.g. +0.3, +0.7) increases exposure and brightens the image; selection of - values (e.g. -0.3, -0.7) reduces exposure and darkens the image.
When the shooting environment is dim and the brightness needs to be increased, and the flash can not work, the exposure can be compensated and the exposure can be increased appropriately. When compensating for exposure, if the photo is too dark, the EV value should be increased by 1.0, which is equivalent to double the amount of light intake; conversely, if the photo is too bright, the EV value should be reduced by 1.0, which is equivalent to half the amount of light intake.
_Exposure Compensation EV-0.7
_Exposure Compensation EV0.0
_Exposure Compensation EV + 0.7
The purpose of flash compensation is similar to exposure compensation, which allows users to adjust the intensity of flash output. Flash compensation can change the exposure ratio of the surrounding environment and flash. When the flash measurement system of the camera can not output the flash accurately according to the shooting environment, which leads to overexposure or underexposure, the flash compensation can achieve a good correction effect.
For example, when taking a backlight portrait, if you want to visualize the background and highlight the main body, you need to choose a large aperture. In order to help people face light, you need to turn on the flash. The lowest shutter synchronization speed of the camera is generally 1/125 s. In this case, the photos taken may be overexposed. This problem can be solved by reducing flash compensation.
_Flash Compensation Normal
_flash compensation + 1
_Canon 450D Flash Exposure Compensation Function