The most popular Photoshop photo editor, which is capable of creating incredible "color representations" in skillful hands, is nevertheless "understanding" to those users who are interested in learning how to make a black and white photo in Photoshop.
Black and white
For this, the program provides several ways to choose from. The easiest way is to click on the button with the prompt “Creates a new ...” in the layer palette at the bottom and select “Black & White” with the default settings. You can stretch the pleasure by selecting the same command in the "New ..." list in the "Layers" menu.
If you wish or need, you can "play" with sliders of various tones, but if you do not intend to tint your photo, uncheck the "Tint" checkbox.
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By the way, if you select an object on a black and white duplicate of a photograph along the path created by the Pen tool (Ctrl + Enter), you only need to press the Delete key and then deselect (Ctrl + D), thus returning the object to color.