The background color of the picture is a bit messy, you can use the channel replacement to reduce the color of the picture, and then appropriate Gaussian blur to the background part of the clean processing. Finally, according to their own preferences to adjust the color can be.
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Original
< small map view big picture >
Final effect
1, open the original material, press CTRL + J to copy a layer of background layer. Enter the channel panel, select the green channel, press CTRL + A all, press CTRL + C to copy, select the blue channel, press CTRL + V to paste. Point RGB Channel, return to the Layers panel. The effect is shown below. This step turns the picture into a green-red picture.
< map 1>
2, create an optional color adjustment layer, red, green, white, black to adjust, parameter settings such as Figure 2-5, the effect is shown in Figure 6. This step turns cyan to green and red to orange yellow.
< map 2>