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Hdr

E

ebacon

Super Member
Any of you play with HDR?

It is a technique that is fairly new to me. I saw an interview with what I suppose was a prominent HDR software developer. He said that HDR is an oddity in that it manipulates images, which is against the grain of film purists, yet ends up with an image that is closer to what the eye sees.

I agree with him except when I don't. :D

The exposure element that he discussed was my experience with HDR until now.

Today I am working on a photo that was taken in hot daylight. When I took the photo my eye saw hot daylight. The view sucked. But my heart knew that there was a little gem under that hot light so I bracketed the shot and composed it in HDR.

HDR created a photo that heart saw, but my eye could not. The added contrast cooled down the image.

Anyhoo. Just babbling while working. Here is an original image and the final HDR. :beerchug:
 

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HDR when done right is no more an oddity due to manipulation in that all photos, film or digital, are manipulated to some degree. After all, developing film is a form of manipulation depending on the chemicals, timing and technique. I also disagree that HDR is closer to what the eyes sees. IMO, the developer is full of it.

As far as the HDR image above, it's overcooked as evidenced by the halo effect around all the objects in the foreground and background.


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For those not familiar with the idea of HDR imaging:

"High-dynamic-range imaging (HDRI or HDR) is a set of techniques used in imaging and photography to reproduce a greater dynamic range of luminosity than is possible with standard digital imaging or photographic techniques. The aim is to present the human eye with a similar range of luminance as that which, through the visual system, is familiar in everyday life. The human eye, through adaptation of the iris (and other methods) adjusts constantly to the broad dynamic changes ubiquitous in our environment. The brain continuously interprets this information so that most of us can see in a wide range of light conditions. Most cameras, on the other hand, cannot.

HDR images can represent a greater range of luminance levels than can be achieved using more 'traditional' methods, such as many real-world scenes containing very bright, direct sunlight to extreme shade, or very faint nebulae. This is often achieved by capturing and then combining several different narrower range exposures of the same subject matter. Non-HDR cameras take photographs with a limited exposure range, resulting in the loss of detail in highlights or shadows."
 
HDR has two aspects. What you see here and has been heavily used until recently is the aspect of capturing a wide range (through multiple exposures, usually) and then compressing it to fit the range of the display or print. You can do similar things with a single image that fits the range of the camera but in which you want the shadow or highlight detail enhanced. As noted above, this can fail to look natural due to visible halo effects. There have been some books and lectures published on doing "natural" HDR.

The second revolution of HDR is to have a display with increased dynamic range so that it can reproduce highlights and deep shadows without compression. This is being worked on for new video systems. One of the problems is to be able to feed both a high dynamic range display and a legacy display both with acceptable pictures. Some experimental broadcasts of car races in England were done, but the compression for standard displays was not automatic. The HDR camera fed the HDR displays more or less directly, but the standard feed was derived through a separate control room that processed the HDR signal the way a standard camera would, with an electronic "iris" adjustment and highlight compression settings being ridden by a video engineer, while viewing a standard monitor.
 
old_tv_nut, You discuss TV with ease. You are the kind of nerd that makes patent attorneys lose sleep. Love you, brother.
 
In my experience, nerds do not cause trouble for patent attorneys - it's the other way around. :p [Sorry, couldn't resist trolling for any patent attorneys who might be here - truth is, I have worked with some great ones over the years.]
 
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