How to create a fine texture and rich black and white effect?

Today's tutorial effect is very style, is the black and white effect of a kind of special, but the light to the operating method may be some students do not know the principle, difficult to extrapolate, today @ his eyes of the mountain students traced to help you thoroughly get to this skill >>>

In fact, this is not completely black and white.

Like this picture:

Let's look at the histogram first:

You can see that the left side of the red channel is not the same as the green channel and the left side of the blue channel.

Similarly, the red channel's rightmost and green channels, the blue channel's rightmost is also different.

In fact, people who know a little about the curve are aware of what's going on.

The red channel is lower on the left, and the right side is elevated, which is obviously the highlight operation.

Let's look at the blue channel and The green channel is also a little different, that is the blue curve, the leftmost pixel will be a bit more, because of the use of the low light stretching curve.

So, after our team picture is processed in black and white, we have to use two curves:

Highlight the red channel curve and use the low light stretch curve for the blue channel curve.

This is used before and after the comparison:

You see the difference?

What are the features of black and white pictures?

The histogram of three channels is exactly the same! like this:

In other words, as long as the histogram of three channels is not exactly the same, it will not be black and white pictures.

OK, it's tonal.

Let's talk about the rest of the story next.

A very obvious part is--Pointe-noire, too obvious.

The other obvious part is--high contrast.

How to identify High contrast?

Like this picture:

First, whether the details are rich or not.

We look directly at the people's clothes, you will find that the black and white contrast is very obvious, the above pattern is difficult to see the CHU (direct transition to black), this is not rich details.

Then look at the histogram:

The midtones are rarely in tune.

In other words, such a picture can never be high contrast:

Because the peak of the pixel is basically concentrated in the middle tune.

The creation of high contrast is very simple, S curve can be.

Then there is the other detail, which is the high light.

You can find that the texture of the screen is very strong, in fact, we have to understand that many times, the so-called texture is to rely on the light to create, and enhance the sense of light can be through HDR, two can be through the Dodge deepening tool.

The former is too complex to talk about, I have said a lot before.

The latter is relatively simple.

In short, the Dodge tool is to increase the brightness, the deeper tool is to reduce the brightness.

One of the biggest advantages of this tool is that it can be automatically partitioned.

You can select the high light, shadow, and midtones in the range to protect part of the image.

For example, you want to enhance the texture of the hair, direct selection of high light and then smear the hair, so that the whole hair will not be white, but also to increase the texture of the picture.

There is also a bit of detail is sharpening, this directly through the USM filter can be achieved.

So the Black-and-white photo seems simple, actually a lot of learning, the above is only a fur.

Category:

• PS Image Processing