Chapter 8 Exercise 3 :Adjusting the image with Levels

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The color level is the light and shade information of the whole picture described by a histogram.
 Modifying color levels is about expanding the dynamic range of a photo (the range of brightness the camera can record), viewing and correcting exposures, adjusting colors, and improving contrast. Overexposure can spill brightness of the photo. 
  Input color level: value is an input to change the brightness of the image. The histogram USES two-dimensional coordinates to represent the distribution of luminescence intensity of the image pixel. The primary function of input levels is to combine the black field/white field to change the ratio of the black field to the white field.

“levels photoshop”的图片搜索结果

The first step is to select the image -> in the menu bar to adjust the color level of -> (Ctrl+L), and the effect is as follows:








(1)

When the black field value increase, the picture will become dark. I adjusted the black field of the histogram by 60 so that the dark part will become dark, while the gray and white fields will remain unchanged.

When I adjust the black field by combining the luminous intensity of the image with the average value below 60 pixels, including 60 pixels, all of which are combined into a minimum of 0.
In other words, the details of the dark part of the image in this interval are no longer available. At the same time, the pixels above the brightness level of 60 and below the gray field will be gradually dimmed so that the parts behind the gray field will not be affected.
In layman's terms, the dark part gets darker, the light part does not change at all, and the contrast is enhanced.

(2) white field value increase, the picture will become more bright, this truth and black field right above it, such as I will be white field value is set to 200. In the 200-255 pixel brightness level in this interval will be merged to 255 level, the brightest lights under 200 degrees will decline, till the end of ash, the ash field had not affected. Actually, this is the level of a merger. After adjustment, the region will become brighter, and the contrast will be enhanced, while the pixel details with the original brightness above 200 will be lost. The specific effect is shown in the figure below:
To sum up, after editing the photo, we can use the "color level" adjustment to correct the image's tonal range and color balance by adjusting the intensity level of the image's shadow, middle, and highlight.









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