Wilt wrote in post #5753504
All the replies have dealt primarily with the technical capture and conversion. Let me dwell for a moment on the CREATIVE side of the capture...when you shoot a photo, it is very important to mentally visualize the end result. I find that SEEING & THINKING in B&W is quite different than seeing and think in Color, so that your photos will compositionally and tonally turn out better if you visualize the end result! Do not simply look at a color scene and shoot it, then covert it to color...as you will probably not create as captivating an image if you only see in color and convert in PP.
This is a great point.
The purpose of filtering in B&W was to control contrast, and also to control the impact of the image. Ansel Adams gave us a stunning example of this with his 1927 image of the Half-Dome in Yosemite.
He explained that he'd made an image using the conventional yellow filter, which would darken the sky. But then, as he looked at the scene, he realized a gray rocks against a gray sky would not convey the stunning contrast of the blackish rocks with a white rim of snow against the brilliant blue sky. So, he made another image with a deep red filter. This caused the sky to go nearly black, the snow to remain very bright, and the sunlit portions of the black rocks to become much brighter. In the end, he visualized an image with a dark sky and bright highlights on the rocks to convey the crispness and emotional power of the scene. A color image would necessarily reverse those values.
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(In another Adams example, he made a photo of a wrought-iron and wood cross on a grave marker at one of the churches on the high road between Santa Fe and Taos. It's in his Southwest book. Some years ago (but decades after he was there), I made a color photo of the same grave marker, in similar light. His image showed a brightly highlighted cross against a dark sky. Mine showed the dark wrought iron and weathered wood against a bright blue sky. Though his image
looked realistic, the use of black and white had allowed him to reverse the tonal values in a completely unrealistic way.)
The question is, when do you do those visualizations? Yes, those with ultimate skill do them in the field. But we can cheat. By making the image in color, we can apply the filtration after the fact, and experiment with different options. I do so using the Channel Mixer, as others have recommended.
It's all a matter of filtering to change the tonal relationships of the scene to something you want. Using the camera in B&W mode, or just converting an RGB image to monochrome, is like using no filter. It may match your visualization, but if it doesn't, there's nothing you can do about it.
In color, this image was a flat monochromatic green. But I applied the equivalent of a yellow-green filter in the Channel Mixer, which allowed the skylit green details to become highlights, while the shaded green elements to stay lower on the zonal scale. It's not that great an image, but the conversion to B&W kept it from being a complete waste of film.
Rick "admitting that this is a scan of color negative film" Denney