The file format used for black and white photos can vary depending on the intended use and the preferences of the photographer. RAW is a popular format for shooting black and white photos as it allows for more flexibility in post-processing. TIFF is also a good option for printing as it is a high-quality, lossless format. However, for most users, JPEG is a suitable format as it is widely supported and offers a good balance between image quality and file size.
When it comes to converting color images to black and white, there are various methods available. Some photographers prefer to shoot in color and convert the images to black and white in post-processing software such as Lightroom or Photoshop. Others may use their camera's in-camera black and white mode, which captures the image in black and white directly. Regardless of the method used, black and white photography requires an artistic eye and a good understanding of composition and contrast to create compelling images.