Last time we talked about Histogram and what is its significance in modern digital photography. We also mentioned that some of the modern DSLRs have feature to automatically highlight overexposure by displaying warning on the histogram graph on the LCD monitor. When I had my first DSLR, Nikon D60, I experienced that this feature was enable by default and you can use your Multi-Selector button to display and hide it but not in case of Nikon D90. So lets go ahead and see how you can enable that feature in Nikon D90 so that you can determine exposure level right from the histogram graph. We will also see how you can set your camera to display color histogram while previewing your photographs on the LCD monitor.
Please mouse over to the picture to see it’s numbers.
As we see in the first picture, Figure 1, you first have to go to the Playback Menu (play icon) and scroll down to Display Mode as show in Figure 2. When you click on that Display Mode, you will get three options: Highlights, RGB histogram and Data. All these options inside Display Mode are disabled by default and you have to enable as you need it. When you check on Highlight option, it will enable Highlight Overexposure Warning and you can see blinking zone right on the histogram graph where your photograph or part of the photograph is overexposed. Second option, RGB histogram, will set camera to display RED, GREEN and BLUE histogram on the LCD monitor while you preview your photo you have taken. That means you can now see the pixel values and concentration of all the colors in your photograph. Last option, Data, will give you details of f-stop, white balance and other EXIF (Exchangeable Image File Format) data related to the photographs.
I will definitely recommend enabling the first option to highlight overexposure area and if you are interested to see what is your camera doing with your photographs, you can enable them all and see what data it provides to you related to your photographs.
NOTE : Even if you enabled these options, you have to use Multi-Selector button to view them while previewing your photographs on the LCD monitor.
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