Replace Color command not working

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i have painfully simple jpeg file -- two-color icon. want use replace color command, able use other day on similar image, change 1 color new color. image rgb 8 bits/channel.

when use replace color command , select new color, new color turns shade of gray. cannot display color want -- goes shade of gray.

i'm sure has type of image, don't know enough photoshop figure out.

can please me? adobe's documentation tells me i'm doing right , offers no assistance if doesn't work. can't find similar problem in forum. i'm going nuts -- since worked flawlessly other day on image -- , appreciate assistance can get. thanks.

your image needs rgb
i (image > mode).

and if area replaced has no colour (ie black or white) won't work either.


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