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What is HDR
High Dynamic Range..

Imagine rather typical sunset scene... Still bright sun, light blue/bright orange sky, but heavy, dark shadows. With normal techniques there just won't be single exposure setting that would correctly expose it all. So we do a series of shots with shutter speeds decreasing from, say 1/2000 to 1/32, from tripod ideally..

Then we combine them in special program into single HDR file. There's no way to display that file correctly on the monitor, but HDR-enabled editors (like Photoshop CS or CinePaint) would be able to run all their filters with much greater precision, which normally does allow you to get most of that high contrast back..

Some mediums have naturally higher DRs than others, they may be also referred as HDR..

Also, there are other uses for HDR images (like using them to precisely match lighting of a scene when compositing in 3D effects.)..

Comments (19)

Http://www.hdrshop.com/http://www.debevec.org/Probes/.

Those are "probes" used in 3D graphics (shots of polished metal sphere reflecting HDR scene.)..

Comment #1

Kscottdublin wrote:.

Can anyone explain what HDR is.

Info links:.

Http://www.naturescapes.net/072006/rh0706_1.htm.

Blended Exposures:http://www.luminous-landscape.com/tutorials/blended_exposures.shtml.

Digital Blending:http://www.luminous-landscape.com/tutorials/digital-blending.shtml.

Merge to HDR in Photoshop CS2:http://www.luminous-landscape.com/tutorials/hdr.shtml.

Tutorial - HDR from 1 JPG:http://flickr.com/photos/cleever/255026221/.

Photomatix:http://www.hdrsoft.com/.

Good Day,Roonal.

'Money doesn't buy happiness, but it makes for an extravagant depression' by golf tournament sportscaster..

Comment #2

There's a forum here devoted to HDR photogaphy:.

Http://www.photocamel.com/forum/hdr-high-dynamic-range-photography/.

And a good tutorial here:.

Http://www.photocamel.com/...ynamic-range-photography/28455-hdr-tutorial.html.

Kscottdublin wrote:.

HiCan anyone explain what HDR is.

CheersK..

Comment #3

That's a fantastic tutorial!.

Zena Marx wrote:.

There's a forum here devoted to HDR photogaphy:.

Http://www.photocamel.com/forum/hdr-high-dynamic-range-photography/.

And a good tutorial here:.

Http://www.photocamel.com/...ynamic-range-photography/28455-hdr-tutorial.html.

Kscottdublin wrote:.

HiCan anyone explain what HDR is.

CheersK..

Comment #4

To do hdr-.

If you put camera into full auto matrix metering, take first shot note fstop and shutter speed. put cmaera into full manual, see if camera still has the matrix fstop and shutter speed. if yes, then using shutter speed go up 2-4 shutter speeds 1 fstop worth of shutter speed at a time. the back to matrix shutter speed and go down same number of shutter speeds.this is on a tripod with cable release..

No, you should not use 1 raw shot and convert 1 stop up and down, because their is not enough dynamic range in the 1 raw shot. dynamic range is why we are doing this, hdr is trying to get all it can..

The group of shots can be raw or jpeg. if jpeg they can be used as is. if raw remember that you HAVE to batch process all 5-9 shots. this is because the pp has to be all the same on every pic. you cannot, for example make any attempt to get the shadow details of the group of raw pics, because that would require different amounts of pp, and you cannot do that with hdr. the pp for all shots has to be identical..

For me I just shoot them in jpeg and use them from the camera, that way they are all identical because the camera jpeg settings are the same for every shot. I also put my hand streched in front of the lens and take a check shot and when done take a ending shot with hand. this tells me where the hdr group is on my memory card when I transfer to the pc..

The only important item is to bracket using shutter speeds only. if fstops are used it changes dof between shots. and shoot enough shots, 5-9 is the optimum. the only other thought is to shoot a scene that deserves the the hdr technique, too many people are shooting hdr because it is new or different or whatever. the scene for hdr should have a very wide dynamic range. this can be checked with a spotmeter on different areas.

In any event, you really need 5-9 shots for hdr; this is more than the auto bracket fcn on almost all cameras. and the bracketing has to be both sides of the middle shot..

And the scene should have no movement, if so the item will blur in the hdr image..

Do not adjust the focus. set the focus on infinity or use a hyperfocalsetup for focus..

Do not adjust the white balance for individual shots. go with awb or 1 setting and do not change it...

Comment #5

I see no reason to use RAW when shooting for hdr..

GaryDeM wrote:.

To do hdr-.

If you put camera into full auto matrix metering, take first shotnote fstop and shutter speed. put cmaera into full manual, see ifcamera still has the matrix fstop and shutter speed. if yes, thenusing shutter speed go up 2-4 shutter speeds 1 fstop worth of shutterspeed at a time. the back to matrix shutter speed and go down samenumber of shutter speeds.this is on a tripod with cable release..

No, you should not use 1 raw shot and convert 1 stop up and down,because their is not enough dynamic range in the 1 raw shot. dynamicrange is why we are doing this, hdr is trying to get all it can.the group of shots can be raw or jpeg. if jpeg they can be used asis. if raw remember that you HAVE to batch process all 5-9 shots.this is because the pp has to be all the same on every pic. youcannot, for example make any attempt to get the shadow details of thegroup of raw pics, because that would require different amounts ofpp, and you cannot do that with hdr. the pp for all shots has to beidentical.for me I just shoot them in jpeg and use them from the camera, thatway they are all identical because the camera jpeg settings are thesame for every shot.

Iffstops are used it changes dof between shots. and shoot enough shots,5-9 is the optimum. the only other thought is to shoot a scene thatdeserves the the hdr technique, too many people are shooting hdrbecause it is new or different or whatever. the scene for hdr shouldhave a very wide dynamic range. this can be checked with a spotmeteron different areas.

In any event, you really need 5-9 shots for hdr; this ismore than the auto bracket fcn on almost all cameras. and thebracketing has to be both sides of the middle shot.and the scene should have no movement, if so the item will blur inthe hdr image.do not adjust the focus. set the focus on infinity or use ahyperfocalsetup for focus.do not adjust the white balance for individual shots. go with awb or1 setting and do not change it...

Comment #6

I always shoot jpeg. I put the raw info inmy hotodoit because many people shoot raw...

Comment #7

Kscottdublin wrote:.

HiCan anyone explain what HDR is.

HDR (High Dynamic Range) is a technique for producing images that more closely resemble our own eyes natural view of the scene being photographed. The reason HDR exist is because a camera doesnt see the same way that human eyes see..

Consider a dark room with a bright sunny window. You may be able to look at the room and clearly see the items in the room and easily see the window and whats beyond it, all at the same time. A digital camera sensor, however, doesnt see the same way. If the camera can clearly see the items in the room, then the window is way too bright. If the camera can clearly see the window then the items in the room are way too dark..

If you take two images of the room...one with the window properly exposed and one with the items in the room properly exposed...and then combine the properly exposed parts of the two images, the result will be an image that more closely matches what your eye saw when looking at the room..

Dynamic Range refers to varying intensities of light. Our eyes have a pretty high dynamic range, and we can see well even when the light intensities of the scene before us vary greatly. HDR attempts to expand the limited dynamic range of a camera by combining the properly exposed parts of multiple images. The minimum is two images, and some people like to combine 9 or more images. (Personally I think five is the max youll ever need.)..

Comment #8

Actually HDR allows a camera to see as much as or more than the human eye sees..

Graystar wrote:.

Kscottdublin wrote:.

HiCan anyone explain what HDR is.

HDR (High Dynamic Range) is a technique for producing images thatmore closely resemble our own eyes natural view of the scene beingphotographed. The reason HDR exist is because a camera doesnt seethe same way that human eyes see..

Consider a dark room with a bright sunny window. You may be able tolook at the room and clearly see the items in the room and easily seethe window and whats beyond it, all at the same time. A digitalcamera sensor, however, doesnt see the same way. If the camera canclearly see the items in the room, then the window is way too bright.If the camera can clearly see the window then the items in the roomare way too dark..

If you take two images of the room...one with the window properlyexposed and one with the items in the room properly exposed...andthen combine the properly exposed parts of the two images, the resultwill be an image that more closely matches what your eye saw whenlooking at the room..

Dynamic Range refers to varying intensities of light. Our eyes havea pretty high dynamic range, and we can see well even when the lightintensities of the scene before us vary greatly. HDR attempts toexpand the limited dynamic range of a camera by combining theproperly exposed parts of multiple images. The minimum is twoimages, and some people like to combine 9 or more images.(Personally I think five is the max youll ever need.)..

Comment #9

Jane Auburn wrote:.

Actually HDR allows a camera to see as much as or more than the humaneye sees..

No, it doesn't. The ability of the camera is fixed. That's why you need to combine several images from the camera. It is the final image that captures a large dynamic range...not the camera..

When you account for adjusting to darkness or brightness, the full dynamic range of our eyes is about 24 stops. However, at any given instant we can only perceive about 10-14 stops of dynamic range. The very best cameras have about 9 stops of dynamic range. That can't be changed. When you create HDR photos you should strive to stay within the 10-14 stop range, even though you can go beyond simply because the idea is to present an image as viewed by the human eye. Sure, you can go beyond that in an artistic endeavor, but it won't look natural, in the same way that the very bright, detailed moon were used to seeing at night wouldnt look right in a blue sky...

Comment #10

FFS half the time I'd swear they copy pasted a long explanation out of a book. It seems no one has given you a simple plain english explanation yet. Ill try. And likely fail so you can yell at me too if you want hehe..

You ever take a picture and find you can either expose for the bright parts or the dark parts but not both? Like for example you can expose for the sky but then the foreground would be too dark? Or you can expose for the foreground but the sky would be blown out? As in bright white instead of blue? That is because your camera's dynamic range is limited..

Well how about taking a pic exposing the sky properly, then taking another pic exposing the ground properly, and combining the 2 in post processing?.

That is what HDR is. HDR stands for High Dynamic Range. The combination of 2 (or more) different exposures to increase the dynamic range of the picture..

Hope that helps...

Comment #11

That's a good explanation..

Canoneyesed wrote:.

FFS half the time I'd swear they copy pasted a long explanation outof a book. It seems no one has given you a simple plain englishexplanation yet. Ill try. And likely fail so you can yell at me tooif you want hehe..

You ever take a picture and find you can either expose for the brightparts or the dark parts but not both? Like for example you can exposefor the sky but then the foreground would be too dark? Or you canexpose for the foreground but the sky would be blown out? As inbright white instead of blue? That is because your camera's dynamicrange is limited..

Well how about taking a pic exposing the sky properly, then takinganother pic exposing the ground properly, and combining the 2 in postprocessing?.

That is what HDR is. HDR stands for High Dynamic Range. Thecombination of 2 (or more) different exposures to increase thedynamic range of the picture..

Hope that helps...

Comment #12

Canoneyesed wrote:.

FFS half the time I'd swear they copy pasted a long explanation outof a book..

What does "FFS" stand for?.

Charlie DavisNikon 5700 & Sony R1HomePage: http://www.1derful.infoBridge Blog: http://www.here-ugo.com/BridgeBlog/..

Comment #13

For f**** sake....

Chuxter wrote:.

Canoneyesed wrote:.

FFS half the time I'd swear they copy pasted a long explanation outof a book..

What does "FFS" stand for?.

Charlie DavisNikon 5700 & Sony R1HomePage: http://www.1derful.infoBridge Blog: http://www.here-ugo.com/BridgeBlog/..

Comment #14

Kscottdublin wrote:.

HiCan anyone explain what HDR is.

CheersK.

High Dynamic Range, or (my own definition) Horribly Distorted Reality..

There are a few sites with dedicated HDR forums. Try http://photocamel.com/forum/hdr-high-dynamic-range-photography (I believe they have an active contest for HDR images right now if you're feeling lucky)...

Comment #15

What does f**** mean? I'm trying to think of 5 letter words beginning with f, but drawing a blank..

Jane Auburn wrote:.

For f**** sake....

Chuxter wrote:.

Canoneyesed wrote:.

FFS half the time I'd swear they copy pasted a long explanation outof a book..

What does "FFS" stand for?.

Charlie DavisNikon 5700 & Sony R1HomePage: http://www.1derful.infoBridge Blog: http://www.here-ugo.com/BridgeBlog/..

Comment #16

Peepingtom wrote:.

What does f**** mean? I'm trying to think of 5 letter words beginningwith f, but drawing a blank..

"Flash"? "Fixed"? "Flush"? "Flood"? There must be hundreds....

But none of them makes expanding "FFS" any easier! .

Jane Auburn wrote:.

For f**** sake....

Chuxter wrote:.

Canoneyesed wrote:.

FFS half the time I'd swear they copy pasted a long explanation outof a book..

What does "FFS" stand for?.

Charlie DavisNikon 5700 & Sony R1HomePage: http://www.1derful.infoBridge Blog: http://www.here-ugo.com/BridgeBlog/.

Charlie DavisNikon 5700 & Sony R1HomePage: http://www.1derful.infoBridge Blog: http://www.here-ugo.com/BridgeBlog/..

Comment #17

I love your definition and to my eyes most of the shots - especially scenery horizon sots - fit that description. Can look dramatic but not realistic..

I find that in 99% of shots I prefer to just shoot so that highlights are not clipped and adjust parameters curve / gamma / log in PP to lift the shadows..

Cheers..

Comment #18

The best HDR just takes advantage of the increased dynamic range offered by the technique..

Rocklobster wrote:.

I love your definition and to my eyes most of the shots - especiallyscenery horizon sots - fit that description. Can look dramatic butnot realistic..

I find that in 99% of shots I prefer to just shoot so that highlightsare not clipped and adjust parameters curve / gamma / log in PP tolift the shadows..

Cheers..

Comment #19

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This question was taken from a support group/message board and re-posted here so others can learn from it.

 

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