A prawda jest chyba tutaj:
"When shooting JPEG images, what you see is what you get, with one little gotcha. When the brightest part of the image is not white, you need to leave a little extra room on the right edge of the histogram if the histogram does not display each color channel separately. The standard luminance histogram display is a mixture of approximately 30% red, 59% green, and 11% blue. This means that if the brightest part of the image is a saturated red or blue, it is very easy for the red or blue channel to clip without the histogram appearing to be overexposed. If your camera displays a separate histogram for each color channel, like the Canon 1D Mark II, you don't need to worry about this, because the the color channels are not averaged together into a single display.
When shooting RAW, things get a little more interesting. There is almost always a difference between the clipping point of the camera histogram and the clipping point of the RAW data, because the camera histogram is based on the in-camera JPEG conversion of the underlying RAW data. In-camera JPEG conversions typically throw away 1-2 stops worth of the sensor's dynamic range, which means that there will typically be up to a stop of extra usable headroom in the highlights when you shoot RAW. The rest is extra shadow detail you get only in the RAW data.
The bad news is that the exposure interval between the clip point indicated by the camera histogram and the actual RAW data varies from camera to camera, depending on the camera model and its' contrast, color space, and saturation settings. The good news is that determining the exposure interval between clip points is fairly easy."
cytat pochodzi z:
http://www.visual-vacations.com/Phot...strategies.htm - warto to przeczytać
Odpowiedz z cytatem