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final renderings
Original picture
1. Select the blue channel, select all and copy, return to the layer panel, create a new layer and paste it.
Select the blue channel, select all and copy, go back to the Layers panel, create a new layer and paste it.
Add the layer mask of layer one to make it editable, and use a black and white brush to edit to leave the parts that need to be colored.
Add a Curves adjustment layer on top, and group the color with the next layer. Note that we are adjusting the color of the sofa, leaving nothing else.
Add a hue and saturation adjustment layer, group it with the next layer, adjust the color of the machine compartment, and restore the sofa to the color of the previous step in the mask.
Add a Levels adjustment layer to increase the brightness of the image and complete the rendering.