Can anyone tell me what this is for?

Histogram! !

No matter whether the photo has rich highlights, is overexposed

or has full detailed shadows

or the details cannot be distinguished at all

Perhaps there is no more valuable reference tool for photographers than the histogram

Most digital cameras today have built-in histogram display capabilities

Yes Displayed separately and displayed superimposed on the image

When you finish taking a photo

You can start to use the histogram to understand the tonal range of the entire image

< p>The histogram shows the distribution of tones in a photo

Reveals the number of pixels present at each brightness level in the photo

The shape of the image drawn based on these values

Can initially judge the exposure of the photo

The histogram is the best feedback on the exposure of the photo

During the shooting period

The photographer You can use it to understand whether the photo is controlled within the desired exposure range

Theoretically speaking

A well-exposed photo

will appear in different The details should be very rich at the brightness level

There is a pixel distribution at each brightness value

Like an undulating hill

For the convenience of observation

p>

Divide the histogram into 5 areas

Each area represents a brightness range

The left side is the extremely dark part and the dark part

The middle is the middle Key

The right side is the bright and extremely bright parts

According to the number of pixels appearing in these different ilangd ranges

For high-key photos (bright and detailed Picture)

The peaks of the hills should be concentrated in the bright area on the right side of the histogram

For low-key photos (pictures with dark tones and rich details)

The peaks of the hills should be concentrated in the dark area on the left side of the histogram

If the hills cover the entire area

It means the exposure is just right and the details are clearly visible