i've seen some submission where it is a black and white image, but they managed to keep something in that same image in colour. how did they do that? for instance, an image of a road and surrounding in B&W, but the lines on the road in bright yellow. Is this done by the camera or software on the PC? isn't this point editing???
I did this in the Photojournalism challenge. It´s quite easy. The picture should have just one object that is the color to remain. (I got hammered because the brakelight on the truck was still there).
I used Photoshop Elementals to remove all saturation from all channels except red. I believe the menu selection was "Image / Color Correction"... Then change the Channel to the color to remove and slide Saturation to 0.
#1: Take a color photo and mask the areas you want the color to remain in. Then desaturate the rest.
#2: Take a B&W photo and color in whatever you want colored.
Both take a little practice and a graphics editor like Photoshop.
If you want it DPC legal, the above is not. The Hue/Saturation setting is the easiest to do, by just desaturating all colors you do not want. This is the place that you can adjust for making great sepia tones, also. ie- Buffalo White Out Overexposed, oversharpened, and Noisy.
My editing software (Adobe PhotoDeluxe home edition - I think it came with the computer or scanner or something) has hue/saturation adjustment, but nowhere to select which color I want to desaturate--I think it's just a general thing.
Does Irfanview allow you to select the color to desaturate? I want to play with this effect, but I haven't been able to yet.
