Create a duplicate of the channel with with most contrast by dragging it to the Create New Channel icon at the bottom of the Channels panel.Gray will have some degree of transparency and as a result will need to be removed. White areas will be 100% selected and black areas will NOT be 100% selected.If the background is white, then the subject needs to be the darkest gray color in the channel that you are selecting to choose the best contrast. You only need to pay attention to the "edges" of the subject in question as the other areas will become white or black.and deselect the " Show Channels in Color" checkbox. NOTE: If the channel thumbnails are in color instead of grayscale, select Edit > Preferences > Interfaces. Open the Channels panel, click each channel (Red, Green, or Blue) INDIVIDUALLY to determine which one has the MOST CONTRAST while hiding the others.Optionally, make a duplicate copy (CTRL/CMD+J) as a backup in case you mess up the duplicate and turn it off.
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