Shulou(Shulou.com)11/24 Report--

Because of its particularity, the photos of stars and galaxies are also complicated in post-processing, such as star alignment, stack noise reduction, star extraction, star shrinkage, soft focus, enhancement of details, color adjustment, removal of light pollution and so on. In addition to the commonly used Photoshop software, you may also need to use some professional astrophotography software.

Some people find the post-processing of Star Galaxy photography particularly troublesome and confusing, often because they do not understand the causal relationship and do not know the purpose of each processing. Therefore, before learning post-processing, we should first understand our purpose.

The photographic works of Hoshino are roughly divided into the following parts in post-processing:

1. Reduce noise

two。 Color blending treatment

3. Starry details

A variety of operation guides in the later stage of starry photography (part I)!

02. The color blending process takes pictures of the starry sky at night, which is usually black or dark red. It needs post-processing to turn the starry sky into a more beautiful color, such as blue.

The professional mode of the camera white balance adjustment phone can adjust the white balance, and the high-end camera can also adjust the white balance. We generally change the white balance from AWB to 2000-4000K. The starry sky taken in this way is blue.

Later white balance adjustment if the white balance is not adjusted during shooting, you can also adjust it in ps, open the Camera RAW filter, and in the basic panel, adjust the color temperature to blue. The tone can be either way, depending on what color you like.

The exposure adjustment is still the Camera RAW filter in ps, and in the basic panel, the exposure increases and the white increases, making the star brighter. The highlight is reduced to avoid excessive brightness in the area of light pollution. There is a slight increase in haze removal to make the photo contrast more obvious.

Galaxy enhancement opens the "radial filter" in the Camera RAW filter to remove haze, increase exposure, increase white, and increase saturation. Then draw an oval circle around the Milky way, and the adjustment you just made will be applied.

This step is the icing on the cake, in order to make the starry sky and the Milky way more beautiful. Generally include "star shrinking processing", "starry softening", "starry sharpening".

Star shrinking deals with shrinking stars, that is, shrinking stars, reducing the area of stars, and visually reducing the number of stars.

Why do we have to do this? Because some photographers only want to photograph the Milky way, and where the dark sky is good, they will get dense stars, which they think will weaken the performance of the Milky way, so they guess that the stars will shrink. Personally, I don't usually do shrinking stars. I like the dense starry sky.

① gets the sky

Copy layer, filter-noise-dust and scratches, threshold 0, radius try to increase until the star just disappears.

At this time, you get a picture of only the sky, subtract the two skies, and there are only stars left.

② minus the sky

Change the blending mode to "difference" or "subtract". At this time, the sky is gone (turned black), leaving only the stars.

③ further separates the stars from the sky

In fact, this step, the separation is not obvious enough.

Click "Channel", select the one with the most obvious contrast from the red, green and blue channel, hold down the mouse and drag it to the new button below to get a copy of the channel.

Press and hold Ctrl+L and move the three sliders to make the star contrast more pronounced.

④ selects the stars

Press and hold Ctrl, click on the small picture of the channel, and all the stars are selected. Don't forget to click on the RGB channel.

⑤ shrinks the stars

You can delete all the layers you just copied and return to the original layer. Filter-other-minimum. Set the appropriate parameters and observe the star shrinking effect. Finally, Ctrl+D cancels the selection.

The softening of the starry sky in the early shooting, you can use the "soft focus mirror", will make the starry sky look better, but also produce a sparkling feeling.

If you don't have a softener, use a post-simulation.

Open the camera RAW filter and select the Radial Adjustment tool to feather 100and increase the exposure a little. Enlarge the picture, draw a small circle around the brighter stars, and it looks like the light from the stars.

There are many ways to sharpen the starry sky. Share the high contrast and retain sharpening here.

① copy layer, filter-other-high contrast retained, radius about 1-3.

The ② layer blending mode is changed to overlay. Sharpening complete.

This article is from the official account of Wechat: photography Research Society (ID:shoujiPhotography), by Zhang Xiaozhang.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.