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Hi, ppl ,I wonder if anybody can tell me how do I know what were the original colors of an old B&W photo , suppose in this photo a motor-car its paint looks middle dark gray in the B&W photo is it blue or green or red when they use these photoshop programmes which convert B&W photos into color photos do they figure out randomly from the gray-scale chart and corresponding to the color - scale - Or the programme does compare the gray-scale with the color-scale automatically without the human intervene ? Please Anyone can enlighten on this .
adding color to images only requires adding saturation and hue if all the info you have is black/white scale. So if you take out hue and saturation on a color image all you end up with is a black and white version of the image displaying only brightness.
you can test this you self by grabing an image online and go to image-adjust-hue/saturation and take out the saturation and you will end up with a b/w image. So the reverse of this would be to take a black and white image and add hue and saturation to certain areas of the b/w images too add colors. To do that you would make a new layer, set the layer mode to color mode (which is adding hue/saturation overlay) and paint away with colors.
Hope what i just said isn't too confusing.
Thanks LuckyDevil for your helpe
Actually what I am after this line below :-
Does the programme compare the gray-scale with the color-scale automatically without the human intervene
What you said is the technical process if anyone follow your instruction but I do not need this Only I need to answer the question in the line above
Sorry, but there's no way to automatically detect what color the objects were from a black and white source. That information simply isn't there in the photo, and the only way to add it back in is to guess manually.