Channel replacement can quickly get clean two-color pictures, and then use the Palette tool to adjust the two colors can get their desired monochrome or two-color pictures, later fine-tuning the characters and local colors can get their desired effect.
Original
< small map view big picture >
Final effect
1, open the material picture, press CTRL + J to copy a layer of background layer, get "Layer 1", enter the channel panel, select the green channel, press CTRL + A full selection, press CTRL + C copy, select the blue channel, press CTRL + V paste, point RGB channel return to the layer board, the effect of the following figure.
< map 1>
2, create hue/saturation adjustment layer, red, green adjustment, parameter settings such as Figure 2, 3, the effect is as Figure 4. This step turns the main color of the picture into tawny.
< map 2>
Related tutorials:
Using PS Channel replacement to create sweet reddish-brown beauty photos
The use of PS Channel replacement to create elegant cyan location characters