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曝光合成,也称包围曝光 HDR

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曝光合成,也称包围曝光 HDR

Postby blin » Tue Jan 17, 2017 4:37 pm

曝光合成,也称包围曝光就是拍摄三张不同曝光的照片合成。包围曝光的原理就是设置三张不同的曝光,一张正常曝光,一张欠曝,一张过曝。可以是相机曝光合成HDR, 也可以是后期合成。

quoted:

HDR stands for High Dynamic Range. And the idea is you take a bunch of …exposures of a single scene, usually bracketed shots are the easiest way to …go. And then you merge them together so …you're taking advantage of the best of all the exposures. …So you open up the shadows with the long exposure, and you use the short exposure …to calm down the highlights, and so forth, and you end up with a beautifully …developed scene. Or at least that's the way it's supposed …to work. Now, Photoshop's solution is this thing …called Merge to HDR Pro, which does what it says, it takes multiple exposures and …merges them to an HDR shot.

Also please refer to this post: Merge to HDR in Photoshop
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Re: 曝光合成,也称包围曝光 HDR

Postby blin » Sun Feb 26, 2017 11:43 am

I do agree that in many cases, manually blending two or three images in post is the better and easier way to go
How to Configure and Troubleshoot Cisco
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Tablet and Smartphone Setup Guide
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blin
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Re: 曝光合成,也称包围曝光 HDR

Postby blin » Sun Feb 26, 2017 11:52 am

HDR or High Dynamic Range Photography is a post-processing technique that uses multiple images of the same scene shot at different shutter speeds to combine them all into a single photograph. The result is an image with the most amount of detail in both shadow and bright areas of the image, close to what the human eye would see. Although it is ideal to use multiple images of the same scene, you could also create an HDR image from a single image, as long as it is shot in RAW format. Hence, there are two methods of creating an HDR image: a) from a single image and b) from multiple images.

when you should use HDR
* Landscapes: Big landscape photos usually have a lot of contrast between the sky and land, which is difficult for your camera to deal with in just one photo. With HDR, you can capture the sky's detail without making the land look too dark, and vice versa.

* Portraits in Sunlight: We all know that lighting is one of the most important aspects of a good photo, but too much lighting on someone's face—like harsh sunlight—can cause dark shadows, bright glare, and other unflattering characteristics. HDR can even that all out and make your subject look better.

* Low-Light and Backlit Scenes (see above): If your photo is looking a little too dark—which often happens if your scene has too much backlight—HDR can brighten up the foreground without washing out the well-lit portions of your photo.

When you shouldn't use HDR
* Photos with Movement (see above): If any of your subjects are moving (or might move), HDR increases the chance of a blurry photo. Remember, HDR takes three pictures, so if your subject moves between the first and second shot, your final picture won't look very good. Photo by William Hook.

* High-Contrast Scenes: Some photos look better with stark contrast between the dark and light parts of the photo, like if you have a dark shadow or silhouette you want to highlight. HDR will make this less intense, resulting in a less interesting photo.

* Vivid Colors: If your scene is too dark or too light, HDR can bring some of the color back. However, if you're dealing with colors that are already very vivid, HDR can wash them out.
How to Configure and Troubleshoot Cisco
http://www.howtocisco.com

Tablet and Smartphone Setup Guide
http://www.quicksetupguide.com
blin
Site Admin
 
Posts: 3605
Joined: Wed Dec 31, 1969 7:00 pm
Location: Chicago, USA


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