There are many methods to convert a color image to black and white, and they offer a wide range of control over the look of the final image. Choose a method that you are most comfortable with.
To produce a quality B&W print from a digital file that meets your expectations, the black and white image file should be submitted in the following specifications:
Do not submit color images. If you convert the file to grayscale in the process, please convert it back to RGB before submitting the file. Files submitted that do not follow these specs may not produce acceptable results and/or may incur additional charges.
These only offer limited control over the tonal range of the final image.
These offer nearly unlimited control over your image. You can search the web for additional options under “Black & White Conversion” or “Black and White plugins”, etc.