Step 1, open the original image, select the menu: Image > Mode > Lab Color, then click the channel panel, select the b channel, press Ctrl + A to select all, press Ctrl + C to copy, click the a channel and press Ctrl + V to paste. Return to the layer cotton version and select the menu: Image > Mode > RGB Color. The effect is as follows:
Step 2: Create a hue/saturation adjustment layer and set the parameters as shown below
The effect is as follows:
