What is stack photography?

Stack is an open area of memory area, which provides storage space for variables defined in functions (definitions other than new). As the name implies, the storage of data in the stack is piled up one by one, that is, the last variable exists at the top (the top of the stack), so when taking out variables from the stack, take them out first (last in first out).

How to shoot the elapsed time by time superposition method

Let's try a completely different shooting idea. Art photographer Matt Molloy's "time stack" photos are widely praised on the Internet, so why not try it in this technical field? All you need is some interesting clouds, a fixed focus and a post-processing to present the final effect to you.

"In order to create photos of these time stacks, I combined multiple photos into one photo," Matt said. "The first thing I have to do is take a photo with delayed effect (taking multiple photos from a fixed position), and then combine several photos in Photoshop."

"When taking photos showing the effect of time lapse, the shooting interval of each photo will greatly change the final visual effect of the picture." A shorter shooting interval can make the cloud track in the picture look more delicate, while a longer shooting interval can create a distance or space between moving objects, thus forming a step-by-step visual picture. The speed of moving elements is also important. Fast moving objects will leave a blank in the picture, while slow moving objects will leave a smoother track in the picture, which also depends on the length of the shooting interval.

"In order to merge photos, I will use the' point light' layer blending mode in Photoshop to increase the brightness of elements in each continuous photo. Once the images are mixed, I will further adjust the picture level and contrast to deepen the tone. I found that automatic processing through Photoshop scripts can save a lot of time and energy. "

How to shoot the slow door effect by superposition method

1, preliminary preparation

Equipment: stable tripod, regular pay-off, computer with cs6 PS.

2. Shooting parameters

According to normal exposure, it is generally necessary to take more than 20 shots, and the interval between each shot is 1- 10 second. The selection is based on the flow rate of the cloud or water. Short intervals can make the trajectory of the cloud look delicate, while long intervals can make the cloud pull out the distance or space when moving, thus forming a step-by-step visual picture.

Because each scene has different cloud and water velocity, different interval time and different shooting quantity, everyone should choose the operation among the above interval values. It is suggested to try the first shot: 20 shots every 5 seconds.

About picture format: If the computer configuration is relatively high, take the RAW format, otherwise take the JPEG format.

3. Post-processing

PS synthesis method:

① Open file-script-load the file into the stack (remember to check "Create smart object after loading layer")-browse-select the picture to load;

② Layer-Smart Object-Stacking Mode-Average;

The effect diagram is as follows:

And (3) splicing the images, that is, finishing.

5. About photometry

It must be measured according to the highlights of clouds or water to ensure that the details of the two are not lost; For the underexposed part of the picture, you should take a new one after exposure. Finish the above overlay, import this exposed picture, and use the relationship between the layer and the mask to get a reasonable exposed picture.

The final effect diagram is as follows:

In addition, the advantages of the stack method are:

① It is inconvenient to omit the filter, especially the ultra-wide angle filter, which is expensive;

2 to avoid the color cast produced by the filter, I am really helpless about the color cast in the later period;

③ Avoid the noise caused by long exposure of the filter;

The most important thing is not limited by time. Especially when participating in team activities, the shooting time of a certain point is very short or uncertain, so how many pictures can be taken by this method, and when it comes back, it is also a slow picture.

Can landscape photographs taken by stacking method take part in the photography competition?

You can take part in the art photography competition.

How to use the stack function of ps to edit photos with large light ratio

How to use the stack function of ps to edit photos with large light ratio

In our daily shooting activities, we often encounter scenes with relatively large light. Everyone is either overexposed in highlights or photographed in the dark. In the early shooting process, there are many methods to deal with this large light ratio scene, mainly including the following:

1. By taking n source files with different exposures through surround exposure (most SLR cameras can take 3-9 shots), and then synthesizing them through the HDR function of PS, you can make a work with high dynamic range, but it gives people a false feeling.

2. Take fill light measures to shoot. The main means to fill the light are flash, medium gray gradient filter, luminous board and so on. Friends who play more professionally may have such a thing, and ordinary players are not willing.

3. Shoot a high-light information exposure priority RAW source file, and then synthesize it through the stack function of PS. Nikon cameras can use the "light focus metering" mode to measure light, and Canon cameras can count light. The key points of shooting are: according to the sub-highlight exposure of the scene, the exposure compensation is increased by 1-3 steps according to the light ratio, and the ISO is as low as possible, so that the exposed highlights are not exposed to death, and the dark parts are not exposed to death as much as possible. This will generate a qualified RAW format source file.

Let me give you an example of how to use stack functions to synthesize works:

1. Open the source file in the ACR of PS. By dragging the "exposure" slider in the basic adjustment panel, the file is decomposed into three files with correct light exposure, correct halftone exposure and correct dark exposure, and stored as files in TIFF (or JPEG) format.

(1) How to make a correct document with bright exposure:

With reference to the histogram, improve the exposure value, so that the highlight will not be exposed (the highlight will not overflow after trimming), and the highlight details will be exposed.

Then store, according to the above parameters, mainly to maintain a large color space, try not to compress the information of the file.

(2) intermediate adjustment file production, the steps are the same as above. Never mind the highlight overflow, as long as the middle tone exposure is correct. Information in the histogram is basically concentrated in the middle.

(3) Make the correct dark exposure file, as above.

2. Stack operation

Path: File-Script-Load File on Stack

Check the following two options, the first one need not be checked, so that the microcomputer runs faster.

Light a cigarette, make a pot of tea, and wait for the emergence of intelligent objects. This is a troublesome process. If your microcomputer configuration is very low, in the process of generating them, store these three files as small format JPG files.

Generate smart objects. Let's pile them up.

Path: Layer-Smart Object-Stack-Average (or Median), the two effects are similar, the noise of the average is small, and the file highlighting of the median has its own advantages and disadvantages.

The following are the median values of this file.

The following is the average file.

Just rasterize the smart object and edit the regular photo to generate a qualified work with correct exposure and no noise.

File after regular editing

Can I take part in a photo contest with multiple photo piles?

Yes, but you can't participate in documentary and news competitions.

What do you mean by stacking cameras?

Stacked cameras are cameras that use stacked CMOS image sensors. Stacked sensor makes better use of light to obtain better photographic effect on the basis of transferring the photosensitive attachment area to the lower part of the sensor, while the sensor area is reduced, and the back-illuminated sensor improves its original photo original and circuit area version, thus making the camera smaller.

What does the cell phone camera stack mean?

Stacked camera is a kind of camera using stacked CMOS image sensor. Stacked sensor is improved on the basis of back-illuminated sensor. It transfers the original accessories and circuits of the original photosensitive area to the lower part of the photosensitive area, so that the sensor can make better and more full use of light and obtain better photo-taking effect, and at the same time, the area of the sensor is correspondingly reduced, which can make the camera smaller.

What's the difference between a back-illuminated camera and a stacked camera? Which is better?

Stacked cameras are superior to back-illuminated cameras.

Stacked sensor is a product evolved from back-illuminated sensor and developed on the basis of back-illuminated sensor. Stacked sensor absorbs the advantages of back-illuminated sensor, makes up for its shortcomings, and makes a more comprehensive optimization and upgrade. In addition, the stacked sensor can also give consideration to the design of back-illuminated structure, which greatly improves the shooting quality of the camera.

Stacking and backlight are two different things, and they are two unrelated structural modes. Stacking is mainly to reduce the size, of course, the picture quality is also optimized; Backlighting is a design for improving image quality. The sensor can be designed separately as back-illuminated or stacked, or both can be used together.