not a photographer - just use them
heres my ps6
as you increase the exposure on the tool bar it gets darker
quote from help:
The toning tools consist of the dodge tool and the burn tool. Used to lighten or darken areas of the image, the dodge and burn tools are based on a traditional photographer's technique for regulating exposure on specific areas of a print. Photographers hold back light to lighten an area on the print (dodging) or increase the exposure to darken areas on a print (burning).
my understanding
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