The Black & White adjustment lets you convert images to black and white with more control than simply desaturating all the colors.
You can convert a single layer to black and white or, using a color adjustments layer, multiple layers in a composition.
To convert a currently selected layer to black and white, do one of the following:
To convert multiple layers in a composition to black and white using a color adjustments layer (all layers below this layer will be affected):
Note: If the adjustment isn't visible, you can turn it on from the Customize menu at the bottom of the Color Adjustments pane.
2. To increase one channel's contribution to the final black and white image, drag a slider to the right; to decrease it, drag to the left. You can also enter a percentage value from –100% to 100%.
3. To increase the brightness of saturated colors from the original image in your new black and white image, drag the Tone slider to the right, or to the left to decrease them. Hold down thekey before dragging if you’d like to extend the range of the Tone slider beyond 100%. You can also enter a percentage value from –200% to 200%.
4. To bring back some color to your image, drag the Intensity slider to the left.
Tip: A good rule of thumb is to keep the total percentage of the red, green, and blue channels at or below 100 percent to prevent blowing out the highlights in your image.
Show Original: Click the Show Original button or press+ on your keyboard to see what the image looks like without any color adjustments.
Show Split Comparison:-click the Show Original button, press + on your keyboard, or force click the canvas.
To reset all Color Adjustments, click Reset at the bottom of the Color Adjustments pane.