There are a few different ways that you can separate colors in Photoshop. One way is to use the layer mask tool. With this tool, you can click on the colors that you want to keep and then click on the layer mask icon. This will create a mask that will only allow those colors to show through.
Another way to separate colors is to use the color range tool. With this tool, you can click on the colors that you want to keep and then click on the color range icon. This will create a range of colors that will only allow those colors to show through.
If you want to keep all of the colors in an image, but want to change the order in which they appear, you can use the levels tool. With this tool, you can click on the colors that you want to move and then click on the levels icon. This will create a new image with the colors in the order that you selected.
You can also use the hue/saturation tool to change the way colors appear in an image. With this tool, you can click on the colors that you want to change and then click on the hue/saturation icon. This will allow you to change the hue, saturation, and lightness of those colors.
The last way that you can separate colors in Photoshop is by using channels. Channels are like layers, but they only contain information about one color.
To view channels, go to the Window menu and select Channels. You will see a list of all of the channels in your image. To create a new channel, click on the Create New Channel icon at the bottom of the Channels panel.
Once you have created a new channel, you can add it to your image by clicking on the Add Channel icon at the bottom of the Channels panel. You will see your new channel appear as a layer in your image.
Now that you know how to separate colors in Photoshop, you can experiment with different ways of creating images. Try combining different techniques to see what effects you can create.
In conclusion, there are many ways that you can separate colors in Photoshop. You can use layer masks, color ranges, levels, hue/saturation, or channels. Experiment with different techniques to see what effects you can create.