First, open your color image in Adobe Photoshop. Select the layer or image that you want to convert to black and white.
Next, go to the Adjustments panel and click on the Black & White icon. This will open the Black & White adjustment layer.
In the New Layer dialog box, type a name for the adjustment layer and then click OK. Photoshop will apply a default grayscale conversion to your image.
Now, you can adjust the settings in the Black & White adjustment layer to fine-tune the conversion. You can adjust the brightness, contrast, and color balance to your liking.
Once you're happy with the conversion, click on the OK button to apply the changes to the image.
That's it! Your color image is now converted to black and white. You can save the image as a new file or overwrite the original file.
I hope that helps! Let me know if you have any other questions.