Original picture:
Rendering:
Step one: Open the original image and copy the layer.
Step 2: Adjust the layer, click Layer-New Adjustment Layer-Channel Mixer, select gray, add a mask, and use a brush to erase the red petals. Set the parameters as shown below:
Step 3: Click Layer - New Adjustment Layer - Curves, use curves or levels to adjust the light and dark tones (use one of the two), set the parameters as shown below:
