First, select the outer gray in the image, press the Q key (the shortcut key to enable quick mask mode), and the part outside the selection area is masked with translucent red.
By default, PS masks the area outside the selection with 50% transparent red. And the quick mask can be applied to the background layer.
Let's modify the quick settings so that the gray background that we don't want to retain is covered. Double-click the "Enable Quick Mask Mode Editing" button on the toolbar to pop up the Quick Mask dialog box, and set the color indicator to "Selected Area" ( That is, the selected area is covered by the color), since the displayed part is mainly green, then we can set the color to its complementary color red to facilitate comparison of the results, and change the opacity to 100% (the selected area is completely covered ).
Enable quick mask mode in layer editing mode:
At this time, you can clearly see the retained image, in which the gray needs to be removed. Press the Q key to return to the layer editing mode, and continue to add the unselected gray parts to the selection. During this process, you can switch to the quick mask mode at any time to observe the selection result (you can also use the selection tool to select the unselected gray part in the quick mask mode, and then fill it with black, you can also get the same result. For those who are interested, You can give it a try. Tip: The Magic Wand selection tool cannot be used in Quick Mask mode). Below are the selection results.
To be on the safe side, we will invert the selection (execute "Select Inverse") and switch to the quick mask mode again:
There are no missing parts under both selections, which proves that all the required content has been selected. In layer editing mode, execute "Select Storage Selection", name the channel, and confirm. In this way, we create a complex selection area for this image and save it for future editing and modification.
Through the above examples, we understand the basic concepts and usage of masks. Masking is an important part of PS. We must admit that it is relatively complicated, especially when it is easily confused with selections and channels. However, this knowledge is necessary. Understanding the concept of masking will be helpful for future learning. Great help.