The following is the effect of "extracting" using Photoshop:
The following is the effect of channel combined with layer mode:
1. Open the original image in Photoshop, create layer 2, and fill it with a green gradient. Other colors are possible, but choose green for the effect.
2. Turn off the little eye of layer 2, click on the background layer, and enter the channel.
3. Select the green channel to copy and get a green copy (because the green channel has the best level)
4. Image-Adjustment-Levels, the parameters are as shown in the figure.
5. Use a white paintbrush to paint out the black in the middle of the wheat ears and branches.
6. Click the red circle to make a selection, an ant line will appear, and return to the background layer.
7. Press Ctrl+j to get layer 3, execute Layer - Trimming - Remove the black edges, and set the layer mode to Screen.
8. Copy one layer with Ctrl+j to get a copy of layer 3. Set the layer mode to Overlay. Look, a crystal clear "wheat" is cut out.
