Photoshop Channel Application: Application of detailed analytic calculation method

Because a couple of friends called me, reflecting exactly what I'm offering in a mixed mode (multiply) and data manipulation (opacity 45%), results for this foreign mm to do the effect looks very poor, or even less direct "go color" effect, so add special note: The use of "calculation" method is very flexible, Without any kind of fixed pattern and fixed data, different photos will have different mixing channels and mixed mode, there will be different data, these uncertainties and data is entirely by your own feelings and experience to make the final decision, which is its greatest characteristics and charm. But the most difficult part of the calculation is here, do a good job will make you overjoyed, Fondle admiringly, it will make you confused with the calculation method, or even daunting.

No wonder the editor-in-chief of the American Phtoshoph magazine, the American Phtoshoph National Professional Association **scott Kelby, praised the "calculation" method for converting black and white, and wrote in the book Photoshop: " The most troublesome thing in Photoshop is the Calculations dialog box. The simple feature of mixed channels is that the layout is too complex, but that's what this dialog box is all about. Once you have mastered this technology, you can improve your reputation by using it. For example, if you're talking about converting from color to grayscale, just inadvertently show: I don't use a channel mixer, I'm using a computational method for conversion. Other people will certainly give you the admiration of the eye. "

Calculation is a color conversion of black and white an advanced method, this method gives you more choice and adjustment, can get excellent results. But this kind of method needs you to the color to the black and white chroma understanding and the experience unceasing accumulation, grasps this technique and uses skillfully, you certainly will convert the color image to the Black-and-white image quality and the effect to do better.

The calculation is a bit complicated, maybe you haven't contacted it, but in fact the calculation itself is very simple, the use of the channel is very wide, starting from this section, you will initially contact this makes many people find it difficult to grasp the methods and skills.

The principle of conversion of color to black and white by computational method is: In RGB red, green, blue three channels, you choose two of the best looking channel to mix, create a new channel, the entire selection process is entirely up to you to decide, you can according to portrait, scenery, still life and so on different topics of content to choose different channels, According to the picture you want to achieve the contrast, high-profile or low-key, etc. to make the appropriate channel selection.

The theory that many people will have a headache, will say you are "just say not practice" street martial. All right, let's get down to specifics.

Figure 1

Step one: Check the channel to determine the two channels that you think have the best effect on the screen.

We first look at the red channel, red Channel general light, especially the highlight part of the exposure, but delicate skin texture, especially the red channel with excellent dark detail. So I decided to choose the red channel.

Figure 2

Take a look at the green channel again. I once said in a reply that the RGB channel to the human skin body appears the most perfect channel is the green channel. First, the overall tone contrast is moderate; second, the skin performance is exquisite, from the high light to the dark part can be more perfect to show out; the third is that there is little noise and noise in the green channel, there is no exposure in the red channel, there is no blue channel that tone too dark, noisy a lot of situation. So I did not hesitate to choose the green channel.

Figure 3

Although there is no need to show the blue channel, but in order to explain more in-depth, we still look at the blue channel situation.

This picture quality is very good, from small to see what obvious shortcomings, but as compared with the green channel, it has a relatively flat tone, the contrast is not enough. Another important reason is that the noise and noise of an image are concentrated in the blue channel, so some people refer to the blue channel as "Dirty Channel". The red channel also has noise, but the blue channel is the most.

However, the choice of channel is based on the image content and quality to choose, it may be completely different. In short, it's up to you to decide.

Figure 4

Step Two: Image/calculation.

Figure 5

Step three: Select Channel merging.

We have just identified the red, green Channel as a merged Selection object. Now you have to fill in: Write "Red" in the source 1 channel menu and write "green" in the Source 2 menu.

The real difficulty is how to choose the blending mode, the different blending methods will have a completely different effect, only by your choice, and according to your hobby to decide.

I chose "multiply" here and change "opacity" to 45%, and I am satisfied with the effect of this blending ratio.

Suggestion: You can try a variety of mixed ways, more practice will accumulate your experience.

Figure 6

Step Fourth: Create a new channel.

When you're all set, press the OK key and you'll find that the channel panel creates a new channel that is automatically named Alpha 1, a completely new channel created entirely by your intellectual thinking and choice.

But it's still in multichannel mode, and it has to be singled out because it's the one we love the most (don't miss it, it's the new channel). Figure selection: Image/Mode/grayscale.

Figure 7

Fifth step: Final adjustment.

Throw away the other useless passages. All right, the world is quiet now.

Finally, the normal way to adjust. can be saved.

Summary: The biggest advantage of computational method is that it is entirely up to you to choose and decide the best channel for the effect.

In the next section we will explain in detail how to convert black and white using the channel mixer.

Figure 8

The final effect graph obtained by mixing channel with calculation method.

Figure 9

Figure 10

Finally provide a piece, we try it!

Material map

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