This is a question I've come across a number of times and I'm hoping someone knows how to do it...
Replace color (PS) works great for actual colors, but I often want to replace a greyscale "color" like black with an actual color (I'm sure there's terminology for an actual color, but hopefully you know what I mean). Replace color only gives me hue/saturation/lightness, which allows me to turn black to grey, but not black to red.
Does anyone know of a way to turn a greyscale into an actual color?
Since everything in grayscale all in the same color range, the only thing I can think of is to hand-select the area you want to change, then airbrush or some tool along those lines. Maybe Select -> Color Range -> Highlights or Shadows if it's really high contrast.
A lot depends if the object you want to change is the only object of that shade in the image.
A possible workaround (in Photoshop) would be to make the image a true grayscale, then a duotone. In duotone mode you can probably change the black area to the second color. Then convert that back to RGB and try your standard replace color technique.
