High Dynamic Range in a single photo wo. post processing?

Started Jul 28, 2012 | Discussions thread
Graystar
Veteran MemberPosts: 8,373
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Re: Colour and tone-reproduction analysis?
In reply to Mark Smith, Jul 29, 2012

Mark Smith wrote:

How can luminance be represented by colour?

I've already described that. Consider a scene with a white object in the sun and a white object in shade. The scene technically has two light sources...the object in the open is lit by the sun, and the object in the shade is lit by the sky glow (hence the reason for such a high K value for white balance in the shade...it's blue light.) When viewing the live scene, the difference in our perception of the two objects is caused by the difference in luminance, as there are two light sources. When a camera take a picture, the white object in sun will be represented by the color white, and the white object in shade will be represented by the color gray. When we view a print under a single light source, the luminance of the live scene is being mimicked by the actual colors of the photo in our hand.

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