Photoshop Color selection not working

[whynot38]

I cannot select a new color to paint with.  I can coose a color but it always paints in gray tones. How do I fix this?

[Chuck Uebele]

Make sure you document is in a color mode, like rgb, and not grayscale.

[c.pfaffenbichler]

Could you please post a screenshot with the pertinent Panels (Toolbar, Layers, Channels, Options Bar, …) visible? 

[JJMack]

Do you have a layer mask targeted they are grayscale channels you can only paint gray, black and white so only gray shades will be selected.

[Michael Bullo]

Just expanding on what @JJMack has already suggested. Look for the corner highlights on the thumbnails within the Layers panel. In my example image, the mask, not the layer content, is targeted. In such a case, even if I had selected a colour, Photoshop would paint with the equivalent shade of grey on the mask.

[whynot38]

I don't have a layer mask.  The original image or background layer is a black and white line drawing and I am trying to color it. The color setting is RGB and when I use the color wheel to select a color the forground and background colors are always in shades of gray.  I will attempt to ge ta screen shot to share.  I have never had this issue before. In fact if I set up a new project with a plain white background, the colors work fine.

[Michael Bullo]

If you are having problems debugging this file, could you copy or move the content from this file to a new one that you know is working as expected?

[rob day]

Could your brush, or the layer you are painting on have its blend Mode set to Luminosity?