How to adjust various colors in ps, such as red to green and green to yellow?

None of the people above told you the answer you wanted, and I looked helpless, and I looked helpless at you. I helped you with my meager strength.

I'll tell you the principle.

I don't know what your picture is like. Every picture is different, so the change method is different. I will regard it as a red flower and a green leaf.

The red value is very large, and the green-blue value is very small compared with red, so it is displayed in red.

Idea: Red becomes smaller, blue becomes smaller and green becomes bigger, so red becomes green. If you use other color matching commands to adjust directly, other colors in the picture will change accordingly, so choose the safflower area to change.

Number one: Look at the red channel. The safflower area is particularly bright and the leaf area is relatively dark. You can also use the Levels command to brighten the light and dim it for easy selection. Then ctrl+ click the red channel, and the red channel selection will appear.

Second: Go back to the Layers panel and copy the background, and click the Mask button below. Such that the red area is covered by the mask.

Third: the mixer selects the red channel to turn down. Turn off the blue channel. The green channel has increased.

It's done. You must handle the details yourself. I can only tell you this. You have to study the usage of the channel mixer yourself, and you won't understand it if I tell you in a few words here.

Optional range: Although the color can be changed, the adjustment degree is very small. Not a good command to change color. Color range: the selection is stiff and the effect is not smooth, which is not a good command to make a selection. Hue saturation: Although you can change the color, it is prone to Matthew effect, so I don't use it often. Color replacement: it can be used to change colors, and it is also prone to Matthew effect. Like hue saturation, the color choices they absorb with straws are rough and rigid. These two commands can be used conveniently and quickly for pictures with a single bright color value level. In fact, it is best to change the color of a single channel, and the adjustment range is also large if the channel mixer changes the single channel. Good command to change colors. You can also change the color in mixed mode by applying the image command. You can also select a good selection by calculating commands, which are all advanced commands using single channel. You should study more.

Photoshop is all about changing channels. Whether you are a master or not depends on whether you can play the channel freely.