High Dynamic range HDR synthesis teaching

If you often deal with landscape photos, I believe you will encounter a problem of repairing the picture, is often photographed landscape, will encounter "repair not back" dilemma, this involves a lot of, one is the camera "dynamic range" is not wide enough, the second is that the scene bright, dark contrast is really too big, even the repair map can not be adjusted back, Small series this time to share the advanced landscape map HDR synthesis.

HDR refers to the high dynamic range imaging of the Hi-Dynamics range, which is used to implement a set of techniques that are larger than the normal digital image technology for a greater exposure dynamic range (that is, greater light and shade differences). The goal of high dynamic range imaging is to correctly represent the large range of brightness in the real world, from sunlight to the darkest shadow.

The emphasis here is "to correctly represent the wide brightness of the real world from sunlight to the darkest shadow", in the real world, the brightest sunset to the darkest shadow of the building, such a wide range of exposure, it is difficult to catch up through a "raw+, so we have to achieve through different means, This method is "HDR synthesis".

Before HDR is synthesized, we have to prepare three photos that are completely different from each other, as in the case of three photos, each of which is exposed to one another, ready to read into the Lightroom.

After reading the Lightroom, select three, right click "Edit in the application, merge in Photoshop to HDR pro", turn on the HDR Pro feature in Photoshop this time. "

In this window, we first look at the bottom half of the three original photos have errors, the upper right corner, please check "Remove ghosting", and select "32-bit", and finally select the lower right corner ACR in the hue.

Then will jump out of this window, this window is actually with the Lightroom inside the adjustment tool is the same, you can directly edit here, the principle and the way and Lightroom is the same, or as I do, press the bottom right corner "OK" after "ctrl + s"archive, this picture will be archived in 32Bits TIFF format.

After you save the file, you can turn Photoshop off, and you'll find an extra 5d3_2269-editor in Lightroom. TIF photos, and in the original file folder will also find a lot of this file, that is, the representative in Photoshop three pieces of raw combined into one, save as a TIFF format to be printed, photo capacity is not small, about 1.12G, after we repair the output, this picture can be deleted.

In accordance with personal preferences for the steps to repair the map, the above is my set for your reference, will not work, this is a passion for the fire cloud landscape is we repair map to come.

What is the difference between a picture that is synthesized from HDR and a single raw file? Looking at the picture comparison, with the same steps, a single raw file to repair the photos, it is obvious that in the sunset and cloud level, HDR high dynamic composite photos, the level of lively some.

Magnification is more obvious, HDR dynamic composite layer of clouds, more than a single raw repair map is rich, and the bottom of the cloud is also, while the sunset more beautiful. Of course, you can say that this is "contrast, shadow, brightness, bright level set differently", but if you copy the HDR dynamic synthesis step to the single raw file to implement, you will find that no matter how the adjustment, can not be like HDR dynamic synthesis as elastic.

The biggest difference is that HDR high dynamic compositing is a 32BIT tiff photo, and we can see that when the exposure adjusts between 10 and +10, and the single raw file can only be adjusted from 5 to +5, HDR dynamic synthesis increases the dynamic range a whole.

Without alteration of exposure, we will adjust the "light"-100, Shadow +100", compared to adjust the local bright, dark effect, hdr high dynamic synthesis, the sky of the sunset, clouds than the single raw come more levels, at the same time the building below than the single Zhang Raw come more clear and bright.

Next we adjust "sharpness +50", increase the surface texture of the object, pay attention to the sky clouds clearer, the house under the same more clear, but with such a shrinking image is not obvious, we are the local amplification to compare. "

Not to enlarge a look so different, a picture of a raw image, feeling the whole blurred, like the sense of lack of focus accuracy, and HDR high dynamic synthesis, in addition to the clouds in a group of clusters of cloud block see very clearly, even the fire of the sky details are more pleasing.

Just looked at the bright part of the details, and then to compare the dark details, I do not expect this layer of difference is also very large, HDR high dynamic composite photos, the whole house is clear, and the darker part of the tree, one to see very clearly, not like a single raw photo, almost all glued together, while the photos are also like the feeling of focus is not clear.

Summarize

Pictured above, on the cathedral of Florence, Italy, on the great Lady of Flowers, that morning the weather with gloomy, to the afternoon 34 suddenly sunny, boarded the top of the church not long after, see this from the clouds through the beam attracted, picked up the camera shot hundreds of, then really feel lucky, And this kind of cloudy changes very big situation, in Europe is very common, fortunately not by the morning gloomy weather cheated.

I've learned this. HDR dynamic synthesis, any contrast to the large landscape, can be restored to 80%, or even 90%, this picture looks closer to what we saw at that time, and even can be adjusted to the personal preferences more, know how to use HDR dynamic synthesis, you will prefer to take pictures, more importantly, You will not be limited by the camera hardware dynamic range, in the scene how to shoot all do not feel discouraged, with "surround exposure" to obtain three different exposure value of the photos, go home and spend a little time to get a satisfactory picture.

Network has many different HDR synthesis software, we have time to try, He Hui today only introduced Lightroom and Photoshop operation mode, focusing on the "single sheet of raw repair map, HDR Dynamic Synthesis "The difference, I believe you see here can also profoundly understand the charm of HDR, but also can understand, the original face such a landscape, alone with a raw repair map still have the limit, the next time you encounter this scenery, do not try to imitate.

Below to share a few more HDR high dynamic composite photos for your reference.