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Anonymous
Not true!
There is a difference between using in-camera BW and Photoshop BW.
If you use the in-camera BW you'll get a desaturated image. Sure, that works alright, I suppose.
If you use a color image, though, you can use photoshop and use the different channel curves to make your "film" more sensible to red, green, blue light, etc. You can be more selective and precise with how your color image is "translated" to black and white.
I've only done this in Lightroom, in which doing that is really easy (and it's actually a tool in that program). You can do it the following way in Photoshop, too:
1) Get the image. 2) Make a layer on top of the image and set it to Saturation. Color that layer with a big black block. This will make the image look desaturated, although color information will still be there. 3) Pick the photograph's layer. 4) Open Curves (Ctrl + M) and play with each of the channels individually for different BW exposure effects. 5) That's practically it.
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