How can I erase different levels of opacity of a color?

I was thumbnail sketches using the Brush tool, in a single color (black) with different levels of opacity for the shading. I had milked on a single layer and on the other, but accidentally shaded shading on the line drawing and can no longer cancel/step back. I need to delete/remove shading and keep the intact black line drawing, but the PS does not seem be able to differentiate between the different levels of opacity and treats as a single colour when I try to use the erase special as Magic Eraser no matter how high I set the tolerance or selection tools, etc.. It's a simple sketch and I could draw it again, but I'm very rusty with PS and I would like to know if there is a solution in case I met this new. Prescheduled A below. Suggestions?

Opacity.JPG

Part three fix

Levels adjustment layer and drag the slider of Pentecost slowly to the left.  This will gradually move the nuances that darkens the white full.  Move the black slider until it is in the fleshy part of the shadows (black) and adjust the slider to the Middle for the best effect.  You will fix with this step.  Just do a lot better.

NOTE: you must change the blend mode of layer of brightness levels.

I'd be inclined to remove all the colors of the image as well.  (Hue saturation, B & W adjustment layer, but do not change gray scale)

Now select the layer levels and do a layer of copy merged top Ctrl Alt Shift (Shift Cmd Opt e) e

Now select the brush, and then change the brush in overlay blending mode (in the options bar)

Carefully paint on the black lines with black to strengthen and shading with white to remove it.  Need you a bit of practice.

It took me about two minutes.  Another ten and you'll have it right, (assuming that the original is a higher resolution)

Tags: Photoshop

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