Photoshop Adjust Channel color Basics Tutorial

The commands for adjusting image colors through color information channels in Photoshop are "levels", "curves" and "channel mixers" commands, which can be used to adjust the overall tone of the image, or to fine-tune individual color channels in the image.

1. "Levels" command (image/adjustment/color level)

The color level section has the video tutorial, the following picture and text only does the simple introduction.

You can adjust the tonal range or color balance of an image by using the Levels command to adjust the relationship between the shadow of the image, the middle harmonic, and the high light.

Channel: This option is changed according to the image mode. You can set different input levels and excellent order values for each color channel. When the image mode is RGB, the color channel in this option is RGB, red, green, and blue, and when the image mode is CMYK, the color channel in this option is CMYK, cyan, magenta, yellow, and black.

Input levels: This option can be adjusted by dragging the Triangle slider of the level, or you can enter a value directly in the text box of the input level.

Output levels: "Output shadow" in this option is used to control the darkest value of the image; Output highlight "is used to control the brightest value of an image.

Eyedropper tool: 3 straws are used to set the image Black field, white field and gray field respectively, so as to adjust the light and shade relationship.

Auto: Click the button to make the bright color brighter, darken the darker color, and improve the contrast of the image. It has the same effect as executing the automatic levels command.

Options: Click this button to change the default parameters in the auto-adjust command.

2. "Curve" command (Image/Adjustment/curve)

The curve section has the video tutorial, the following picture and text only does the simple introduction.

The curve command adjusts the overall intensity of the image. Perform an image adjustment, Curve command, and a dialog box that pops up a curve. In this dialog box, the tonal range is displayed as a straight diagonal baseline, because the input and output levels are exactly the same.

Channel options: This option is changed according to the image mode. You can set different input levels and excellent order values for each color channel. When the image mode is RGB, the color channel in this option is RGB, red, green, and blue, and when the image mode is CMYK, the color channel in this option is CMYK, cyan, magenta, yellow, and black.

3. "Channel Mixer" command (image/adjustment/channel mixer)

The channel mixer is used to modify the target color channel by blending the existing color channels in the image to achieve the goal of adjusting the color of the image.

The dialog box can display channel options in 2 image modes, RGB-mode images or CMYK-mode images, and they operate essentially the same way. This is a detailed description of the various options in this dialog box in RGB image mode.

Presets: The Drop-down list includes several preset effects options for the software, and they can create grayscale images with different effects.

Output channel: The output channel option can be used to select the color you want to adjust.

SOURCE Channel: 4 sliders to adjust the color weight of the selected color.

Constants: This option adjusts the grayscale values of the output channel. Negative values enhance black pixels and positive values enhance white pixels. When the parameter value is set to 200%, the output channel becomes full black, and when the parameter value is set to +200%, the output channel is completely white.

Monochrome: Enable the Monochrome check box in the Channel Mixer dialog box to create high-quality grayscale images. Note that the "monochrome" checkbox is enabled, and when you convert a color image to a gray image, you must adjust it in the current dialog box, or you will paint the image if you want to adjust its contrast.

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