Mike Langford suggests that while technique is important, thinking through the aesthetics of what you want to communicate in your photograph is the first step.
"In the days of film when we needed to light interiors, so you could see and communicate an interior space in the best light possible, the adage was that if you could see that the space had been lit with some form of supplementary lighting, then it was probably lit badly - and most times this was obviously correct. Good technique in this case meant that you needed to visually mask the supplementary lighting so it would blend in with the available light and not look obvious.
"With digital photography, we now just take two exposures of the space - one for the natural light coming into the space through a window and another for the lighting already in the interior, then blend them together in Photoshop. This still requires an understanding of lighting aesthetics – what works and what doesn’t and why.
"The aesthetics answer is that one light source needs to be dominant over the other. As to which one is rendered correctly depends on which one is the subject of the image. In the case of the photos of a room with a view included with this article:
• If it’s the ‘view’ from the room that is the subject, then the view needs to be exposed correctly so you can see it clearly.
• If the photo is of the ‘interior’ that has a view, then the interior needs to be correctly exposed so you can clearly see what is in it.
Technically, it is virtually impossible to photograph the dynamic ranges of both of these exposures in one capture, which is why we need to use two separate exposures and blend them together in Photoshop.
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