Problems with Photoshop black and whites...?

After comparing the black&white colours from Photoshop to Paint, I noticed that the black&whites isn't as "sharp" in Photoshop. I also noticed that the white colours isn't really "white" since I wasn't able to fill the white parts instantly with the Paint Bucket Tool, unlike using Fill in the Paint program. Does anyone know how I can get around this?

There can be several things that could effect your issue. If you are using a color calibration device, it may change your white balance. Check and verify that you really are using pure white when filling, a value of 255, 255, 255 thats red, green, and blue. Check and see what color mode you are in, are you in 8 bit, 16 or 32 bit. Are you in RGB, CMYK, or other color mode.
I am sure there are a few other things, that I haven't thought of at the moment that can effect your issue.
The next question is what do you mean by black and white? or should I say how did you make it that way. Was it already a black and white (grayscale)? or did you convert it in photoshop and if so how. The reason I ask is there are more than one way to convert a color image to black and white and how you do it will effect the final outcome.

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