Shulou(Shulou.com)11/24 Report--

The original title: "the use of color levels, a thorough explanation of the article, collect it!" "

In fact, the color level and the curve are very similar, except that the curve adjusts the picture by "dotting on the line and changing the line through dots", while the color level adjusts the picture by "directly changing five sliders". Everything else is the same.

Basic principles usually a photo in rgb mode will be numbered with three primary colors (three primary colors, which can be mixed to get everything), representing the values of red, green and blue respectively.

For example, 0, 0, 0 means red, green and blue are all 0, which is black. 255, 0, 0 represents red 255, green and blue are all 0, which is red. Official account Photography Research Society. 255,255,255 means red, green, and blue are all 255, which is white.

When you turn on the levels, you will see these numbers at the five sliders. You can not only see, but also modify these numbers. When the number changes, so does the color of the photo. This is the principle of image modification of color levels.

There is also an option above, when you select "RGB", the color level will change all color values. If "R" is selected, it will only change the value of the primary red color. Everything else is the same.

02, the meaning of each slider level slider is divided into two rows: the first row is "input level", there are 3 early can be adjusted. The second row is the output color level, which can be adjusted in 2 places.

① output levels Let's talk about output levels first. The minimum value is 0, which represents the darkest value that can appear in the photo, and 0 is black. Maybe there is no black in your photo, but you have the condition of black.

What if I change 0 to 100? That means the darkest number that can appear in the photo is 100100, almost neutral gray. In other words, the darkest place in your picture can only be neutral gray, it can't be any darker. Even if you apply it with a pure black brush, it will turn neutral gray.

I made a picture of pure black (0pj0pg0). I only adjusted the color levels on the right side, and I can see that the black has turned to gray (100100100).

The maximum value of the output level must represent the brightest color, which in this case is 255, and changing it changes the brightest color that can appear. If you understand the above, you will understand this, and I will not repeat it.

The left side of the ② input level also represents the darkest color, which corresponds to the output level. For example, if the darkest output level is 0, the darkest input level is 100.

If the input is 100, it means that 100 will be the darkest. So how much is the darkest? it is 0 (because the excellent level is 0), that is, if 100 is to become 0, then everything below 100 must also become 0.

If you understand the minimum input level, you will certainly be able to understand the maximum input level. I'll repeat it again.

I made another picture, which is a uniform gradient from 0 to 255, and only adjusted the color levels in the right half.

There is also a slider in the middle of the input level, and the default value is 1, which becomes larger to the left and smaller to the right. (I found that some of the color levels in the App are just the opposite, depending on the developer's preference.)

What this changes is the brightness of the midtone. Sliding to the left brightens the midtone and to the right darkens the midtone, with less impact on the brightest and darkest areas.

03. Common operations 1. Change the brightness input level: slide the emphasis slider to the left to brighten the photo, slide to the right, and darken the photo.

two。 Change the contrast input level: slide the slider on the left to the right and the slider on the right to the left.

3. Change the black and white market. I don't know if you have ever seen such a picture, which has the taste of retro film. Their secret is that the darkest place is not black, and the brightest place is not white, which reduces the contrast appropriately.

Output levels: increase the minimum value and decrease the maximum value.

4. Adjust the color when adjusting the color level, select either R\ G\ B channel separately to increase or decrease the color, thus changing the overall color of the photo.

04, the correspondence between curves and levels mentioned earlier, the adjustment principle of curves and levels is the same, let's take a look at the corresponding relationship between the two.

1 right slide = 5 right slide; 2 left slide = 6 left slide

3 right slide = 5 upward slide, 4 left slide = 6 slide.

This article is from the official account of Wechat: photography Research Society (ID:shoujiPhotography), by Zhang Xiaozhang.

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