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What is the advantage of carrying a tripod and ND-filters when you could use image stacking instead?
I'd like preface my answer with a note that a tripod is not only useful in conjunction with ND filters — it also improves the results from image stacking as well. By fixing the position of the camera, the tripod eliminates changes in perspective, which can occur through minor motion while hand-held shooting a sequence for image stacking.
Aside from fixing ...
13
What is the advantage of carrying a tripod and ND-filters when you could use image stacking instead?
Well, with regards to your (1)... You could carry a light tripod (or beanbag or any other way of stabilizing a camera) and use only a single ND filter instead of several stacked filters.
With regard to (2), yes you could do that, but stacking a sequence of discrete single images will give you a result that contains several discrete non- or less-blurred ...
8
Yes, this precisely what Photoshop CC's Shake Reduction filter does. Adobe first publicly demonstrated their prototype feature at Adobe Max 2011. The crowd was pretty wowed by the demo. While it was demonstrated in 2011, Piccure actually introduced the feature before Adobe in 2013, as a plugin to Photoshop.
See also: Adobe's help page for the Shake ...
6
If you're looking for a grouping term, I don't think there is one that's used widespread or consistently, but personally I sometimes use stacking to cover these types of techniques.
I just wish there were a term that could also include panorama stitching, since the main logic behind nearly all of these types of algorithms is similar--vary one specific ...
6
What is the advantage of carrying a tripod and ND-filters when you could use image stacking instead?
For me the main advantage is... Joy.
I enjoy a lot more taking photos, people places, products, rather than editing the images, especially on automated tasks, like stacking photos. Of course, there are some parts enjoyable, like tweaking the final result. But, overall, I prefer not having a ton of shots to review.
Taking a long exposure image on site gives ...
5
I found what I believe is the answer I was looking for, which is "epsilon photography".
Quoting from Wikipedia:
Epsilon photography is a form of computational photography wherein
multiple images are captured with slightly varying camera parameters
(each image varying the parameter by a small amount ε, hence the name)
such as aperture, exposure, ...
5
Yes, using deconvolution you can invert any linear map from a hypothetical sharp image to a (hypothetically noise free) unsharp image. The actual image you have is not just an unsharp image caused by diffraction it also contains noise which will limit the effectiveness of deconvolution.
In general, the problem is easy to describe. A point in the scene that ...
4
EDIT: Originally I misread your question to only mean increase in resolution. I do not know of any term that encompasses that an HDR but these two cover quite a bit:
Super-Resolution, although it covers multiple techniques. This term has been used by camera manufacturers to describe techniques where they create a higher-resolution or increase color-depth by ...
3
What is the advantage of carrying a tripod and ND-filters when you could use image stacking instead?
For use cases where image stacking might often be the preferred technique over single long exposures, a tripod or other physical method of stabilizing the camera is still invaluable and almost always the best technique to get the best result. It also significantly reduces the time spent on post-capture work per finished image.
3
The purpose of the HTC dual lenses is to create a "depth map". The distance between the camera and the objects in the picture is computed : each pixel has a distance associated. The following example (from http://www.i-art3d.com/Eng/About_Depth.htm) shows a depth map :
Knowing this, an algorithm can recreate artificial "depth of field" effect, emulating a ...
3
Here are some of the ways:
http://www.image-engineering.de/iq-products/iq-tools/measurement-devices/camspec
http://www.image-engineering.de/iq-products/iq-tools/measurement-devices/camspecs-express
I use a monochromator, light sphere, and a photodiode. You can find most of those supplies at Edmund Optics http://www.edmundoptics.com/ and similar shops.
You ...
2
You are not clipping the intermediate RGB values.
From the sRGB Wikipedia article you linked to,
The intermediate parameters R, G and B for in-gamut colors are defined to be in the range [0,1], ... The linear RGB values are usually clipped to that range, with display white represented as (1,1,1)
From the W3C sRGB spec you linked to,
... XYZ are ...
2
What is the advantage of carrying a tripod and ND-filters when you could use image stacking instead?
1: I typically carry just a light tripod and a single 10-stop ND filter. I find that this is stable enough.
2: Taking multiple pictures would work but sometimes you can get gaps between pictures (this can be solved by taking lots of pictures which would take longer). I don't like to do it this way since you don't know how the image will turn out until after ...
1
How big objects appear in a picture and from which side they are seen only depends on the location of the objects and the camera. So if you want to see how a picture would look is it was taken with a higher focal length lens, you can simply crop the picture.
If you want to know how a picture would look if it was taken with a longer lens and from a larger ...
1
What you know is the field-of-view. Any 4 images in a row covers exactly 360 degrees with no overlap, unlike the source images to produce the original stitched panorama.
So 4 images covering 360 means that image has 90 degree angle of view horizontally and vertically. The diagonal angle of view can be deduced by the Pythagoras Theorem to be just over 127°.
...
1
This will totally depend on what facial recognition software you are using. A few other things to suggest are:
Make sure there is no occlusion of the subjects face in an image (such as wearing sunglasses, the subject having hair over their face etc)
Ensure the subjects eyes are in focus (many facial recognition algorithms rely on the eyes being important ...
1
I don't think that there's a specific term for that in photography.
A term to describe the idea of combining information of many images into one in general could be superposition.
1
The relationship between two objects of different sizes located different distances from the camera is determined by only one thing: shooting distance. More specifically, the distance between the camera's entrance pupil and the part of the object facing the camera. This is what is referred to as perspective.
For more, please see What does it really mean ...
1
-6.173 is definitely not within the range 0 to 1. Am I doing something wrong? If not, what should I do with such a value?
The values that are outside of the 0..1 range are values that are out of gamut of the target sRGB color space - i.e sRGB can't describe them. So even though -6.173 seems like a huge value to ditch, it needs to be clipped to zero. If I am ...
1
Yes, color sensitivity is often measured and specified in bits. DxOMark provides one example and incorporates this into their camera ratings. From the description of their "Color Depth" test:
Color sensitivity
indicates to what degree of subtlety color nuances can be
distinguished from one another, often meaning a hit or a miss on a
Pantone ...
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