I have an RGB color image that I'd like to print with a black-and-white laser printer. I'd like to have some control over how the image is dithered rather than letting the printer do it.
I'm aware that in Photoshop (or most raster image editors) that I could convert the image to indexed color (or export it for the web), choose my limited color palette (in this case, black and white), and dither it.
However, I'd prefer to have something more dynamic, akin to a Threshold adjustment layer or to the Posterize filter, so that I can use the Burn and Dodge tools to more precisely control the dithering of specific parts of the image. Having to change color modes and then undoing involves a lot of trial-and-error and is rather tedious.
Does any such thing exist?