The viewing rule of histogram is "left black and right white". The left side represents the dark part, the right side represents the bright part, and the middle represents the middle tone.
Vertical height represents the degree of pixel density. The higher the height, the more pixels are distributed on the brightness.
As an example, for a "normal" photograph, the histogram should be high in the middle and low on both sides.
& nbsp; & nbsp; & nbsp; that's the picture.
& nbsp; & nbsp; & nbsp; & nbsp; sometimes the histogram of a photograph becomes abnormal, for example.
Histogram without halftone
& nbsp; & nbsp; & nbsp; & nbsp; as can be seen from the histogram, this photo has almost no shadow because there is no height at the far left. Not only that, but the picture doesn't even have much middle tone. Moreover, the most important point is that the right-most pixel directly reaches the top, which indicates that there are a lot of highlights in this photo, so it can be judged that the histogram should correspond to high-profile photos, or overexposed.
So, on the contrary, if there is a high profile, there must be a low profile. Let's see what a low profile histogram looks like.
& nbsp; & nbsp; & nbsp; & nbsp; contrary to high-profile, low-profile has a large number of shadows and few highlights. The picture is like this:
Low profile photos
4. Low contrast
& nbsp; & nbsp; & nbsp; & nbsp; well, we've all talked about high-profile, low-profile and middle-tone histograms. It should be noted that the contrast of these pictures is normal. The contrast in the histogram is that the highlights and shadows have pixels. It can be very few, but it must be, otherwise the picture will look grey. Let's take a look at the histogram of low contrast photographs.
Low Contrast Histogram
& nbsp; & nbsp; & nbsp; & nbsp; & nbsp; this histogram is a typical low contrast, which usually appears, indicating that the photo can hardly be seen, just like this:
Low contrast photographs
& nbsp; & nbsp; & nbsp; & nbsp; & nbsp; gray photos, can not be seen.
Of course, there are also low-contrast images that look good, but their histograms are not as extreme as those shown above. Generally, there is no pure black, but the highlights are enough. Let's take a look:
& nbsp; & nbsp; & nbsp; & nbsp; it is obvious that there is no pure black in the histogram, not at all, but the highlights are sufficient, and this is the case with this kind of photograph.
Low Contrast Photos with High Light Ratio
& nbsp; & nbsp; & nbsp; & nbsp; well, there are a few common histograms.