Photography from film to digital transformation in the process of undergoing a thorough change, but at the same time, on the basis of photography – light – has not changed. Photography is actually a light writing , which means the photographer is a light writer. To be able to light display in front of us, which allowed us to become a photographer. After all, everyone can buy high-quality digital cameras, but few can subject in the correct light. You may not think so: The author used up in the right light.
4.1 eyes with the camera
everything from how our brains to see how the camera records light and the light started. The camera is more complex record of the content may not be able to print the page again. Here's why.
in bright sunlight, the brightness of the light is too wide, either digital cameras or film cameras, they can not shoot at the same time to high light and shadow in the details. And the fact that the brain's visual processing in different ways. As we watch the wide range of brightness of the scene, the brain first of all pay attention to the brightest of the region. Remember it light and high in the middle of the details of the transfer, and then inform the pupil size in order to observe the shadow of the details. Two real-time images to the brain – the brightest and most images of the dark image – together, so we believe that we can see the brightness of the scope than we can actually see wide. In other words, real-time brain imaging done on dealing with Photoshop. Who knows this?
digital camera records the brightness of the scope of the film than the width, this is a good one. But the problem is that the printer can not reproduce the brightness of the scope of film, digital cameras, not to mention the range of brightness. To be able to print the scope of the brightness of the light will be displayed at the same time high light and shadow in the details. Good ink-jet printers can be maintained for the RGB value between 25-40 scope and the shadow of 242-249 between the high-ray images within the scope of the details. Lightroom print from the same, but the RGB value is expressed as a percentage. Brightness in the range of 7% to 95% between light and shadow reproduction details. Printers, ink and paper combination will also affect the results. The new printer can reproduce beyond the scope of the brightness of the light wax paper or paper shine. Fine paper, thick paper, watercolor paper or canvas paper reproduction of high-brightness light and shadow on the scope of the smaller details. If the sampling RGB value lower or higher, will certainly be at the expense of the shadow or highlight the details. The complexity of today's digital camera built-in software to help set exposure, which has been very consistent image quality. The algorithm will tell the camera to take care of abandoned or which side of the range of brightness. Usually tends to remain high in light of the details, and let shadows darken. This will fool the camera is a good compromise.
LIGHTROOM value
Lightroom engineers (as well as about 500,000 beta testers) to see first of all digital photographers can see everything. Then they asked: This is really meaningful? Which makes no sense is a red, green and blue values of the display. Lightroom to show that the percentage of RGB data. As a result, black is 0%, 100% is white. Bridge and Photoshop to 0 to show that black and white display 255. 0-255 number system used to the lack of understanding Lightroom photographer may be the percentage. One solution is to Lightroom of 2.56 multiplied by the percentage of reading, which will convert it to the 0-255 number familiar with the system. Therefore, Lightroom's 97.3 percent is 249RGB. RGB in about 25 of Lightroom is 10%. The book will be in the right places demonstrate both the number system.
in Figure 4-1 in, Photoshop and CameraRaw the RGB value at the top of the display, the corresponding value of Lightroom at the bottom of the display. All-black and white paper between 21 gray. You can see a few class? For purposes of comparison, a row of gray tones to be dealt with step-wedge.
