Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange
Join us in building a kind, collaborative learning community via our updated Code of Conduct.
The View

The View
by Aganju

Submit your Photo
Hall of Fame

Please participate in Meta
and help us grow.

Image processing is the computational transformation of an image signal. It's about the technical side of batch transformations, conversions, and enhancements, as distinct from post-processing (adjusting an image to achieve a desired look, probably using image processing).

2
votes
0answers
41 views

How to programatically adjust exposure based on image metadata?

As part of a photogrammetry project, I took a number of photos (in NEF RAW format) of an object using manual settings on a D800. However, I forgot to turn off auto-iso (argh!). So, all my photos ...
1
vote
2answers
170 views

What image/camera/lens quality metrics are relevant for resolving human subjects?

I am attempting to gather data for creative historical purposes. However, I'm a computer scientist, not a physicist or a photographer, and there seem to be a gazillion considerations. The environment ...
0
votes
1answer
44 views

How does the scale of a CCD work and what does the function of gamma do to this scale?

I am using a fluorescent microscope with a CCD attached so that I can take images. What I'm wondering is how the scale between the pixel values works? is it different for different CCDs?
3
votes
2answers
74 views

How can I interpolate each color individually (i.e. export an image just with Red Color) using dcraw?

I'm doing a project where I need to export 3 different images from a raw file (DNG or RAF), each image with a different color (Red, Green and Blue). I'm using dcraw.c, Dave Coffin's raw photo decoder. ...
6
votes
2answers
99 views

Can using a high resolution sensor and downsampling compensate for a soft lens?

In this question Does super-sampling produce good results? the difference in quality between using a high and low resolution sensor of the same size and then downsampling the high resolution one gives ...
5
votes
3answers
179 views

How do I correct the huge blue-shift in these images?

I recently inherited a lot of images with a lot of blue on them (attached below) I would like to correct this, get the natural colours. I am just aware it was taken using a Nikon D60 18-55 VR lens, ...
1
vote
2answers
73 views

How to make Identical Images Of the Same Dimensions and Pixel Density Have Similar size [closed]

I have two images with the same dimensions. One is a facebook icon and the other is a plain white image. They are 32 bit, 128 pixels by 128 pixels, 96 pixels per inch and 3.39 cm but one is 1.87kb and ...
2
votes
4answers
302 views

Finding focal length from image size and FOV

I have bumped into this statement in an Engineering journal. The statement is mentioned on right side example. A 640x480 image with a horizontal FOV of 47 degrees gives focal length f = 740 pixels. ...
2
votes
4answers
295 views

How to copy Images Back To DSLR from computer?

I'm looking to solve this issue of trying to get my DSLR read images to put on the memory card from the computer. Here are the steps to reproduce the issue: You click a photo Transfer it to your ...
4
votes
1answer
234 views

How to process DSLR RAW files for display on modern HDR-capable TVs & computer monitors? (actual 10bit/ch or 12bit/ch dynamic range)

10bit/ch display panels are becoming common. The latest generation UHD TVs can display 10bit/ch, some consumer TVs have as high as 1000nit output. Very recently HDR computer monitors have (finally) ...
12
votes
11answers
5k views

Why don't cameras record light data throughout the entire shutter?

Sorry if the question title is confusing, I don't know the best way to word this,so feel free to change it if you can think of something better. I learned electronic shutters can capture the image all ...
0
votes
0answers
49 views

Stereo camera vs camera arrays

I am wondering about the advantages of plenoptic imaging over stereo imaging in terms of building depth maps. To me they look identical but stereo seems to be a better deal when it comes to the ratio ...
1
vote
1answer
140 views

How to create abstract color profile to encode specific color transformation?

I have a set of images (48-bit TIFF) that are encoded in ProPhoto RGB. I have a set of alternative input color profiles (related to ProPhoto RGB, but slightly different) that I can assign to the ...
2
votes
2answers
188 views

What is the name of the problem where lines appear in a photo where there should just be a smooth gradient?

I don't remember the name of this problem and it drives me crazy. I googled everything similar to "lines in photo" but I didn't find the solution. The problem is that on my PC monitor I don't see ...
5
votes
3answers
211 views

How to deal with single channel overexposure?

I've been shooting quite a few gigs at clubs/concerts and repeatedly experience issues with scenes lit by small bandwidth lights (for example lasers). These lights cause a single channel to ...
0
votes
0answers
26 views

Processing Imacon 3F Files

Can you process 3F files from Imacon using phocus software? I only limited to using FlexColor? I have tried in photoshop but looking for better software other than FlexColor.
6
votes
3answers
156 views

Motion-Still photographs

So I've seen these high quality photographs on Instagram which look like they are Combination of motion & still photographs. I mean some parts of the image is still just like a normal snapshot ...
4
votes
2answers
4k views

How can I convert an Apple iOS HEIF image into JPEG?

How can I convert an HEIF/HEIC image into a JPEG? Maybe using ImageMagick?
-4
votes
1answer
75 views

What is this filter called and which programme has it? [closed]

I want to use this filter in my pictures. What's this filter called and which programme can be used to apply this filter?
1
vote
2answers
337 views

Lightroom Grey card algorithm for white balancing

I am trying to learn grey card algorithm to adjust the image color based on the Grey Card used. From as far this answer I had tried one of my photo:- Selection color(Grey Card Color) :- 115,168,178 ...
0
votes
1answer
89 views

What photo characteristics work best with facial recognition software?

I have teams that are doing surveys and taking photos of respondents (in and around their homes, often outside) with permission to take and use these photos for facial recognition. We're complying ...
4
votes
2answers
207 views

Can deconvolution help improve the apparent sharpness of mirror lenses?

I have recently ordered a Samyang 500 mm/f6.3 mirror lens on eBay, for about £80, largely out of curiosity -- at the very least, it will be an interesting toy and I can always sell it. Mirror lenses ...
3
votes
3answers
466 views

How to use histogram adjustment when scanning?

I just got an Epson V600 and have been trying to learn some of the features, such as the Histogram Adjustment feature of the included processing software. The interface looks like this: What are the ...
0
votes
2answers
390 views

Get pixel to mm ratio from image

Is is possible to get pixel to mm ration from image exif. I have focal length of camera, image resolution, as well as camera distance from object in image (outside exif). I have distance from origin (...
0
votes
3answers
489 views

Image Stacking for noise reduction using MATLAB [closed]

I'm new to Image processing and started using MATLAB for Astrophotography processing. I'm trying to process 10 corrupted images (Same Image but mixed with different noise) of Planet Saturn using ...
11
votes
2answers
2k views

Why does my Canon 700D take so long processing when I take a long exposure? [duplicate]

I am trying to get into long exposure time lapse photography, and was wondering if there was a way of speeding up or turning off the processing of the image! When doing long exposure time lapse at (...
-1
votes
3answers
451 views

How to calculate distance of an object from camera or size of an object in an image? Have to utilise already generated camera parameters to find these [duplicate]

How to calculate distance of an object from camera or calculate the size of a object in an image? Given that, I have already generated the camera parameters (intrinsic and extrinsic). I have to ...
0
votes
2answers
143 views

Is it possible to simulate any color-only filter with curves?

In this question it was asked whether it was possible to reproduce any color-only change to an image using just curves. In my answer, I said that there were color-only changes such as conversion to ...
0
votes
2answers
175 views

Trying to create a serial number for every imported image

Someone correct me if I'm wrong, but the sequence numbers Lightroomor CaptureOne Pro (I'm currently using both) supports in file naming (at import or export) are not continuous, right? In other words, ...
5
votes
2answers
441 views

Is it possible to find out what compression ratio was used for a particular JPEG?

I have a couple of JPEGs. Is there a way to find out which compression level was used when encoding them? That is, were they encoded at level 60 or 90? The reason I'm asking is because I have a site ...
1
vote
1answer
187 views

Why do some cameras offer 5-axis stabilization only in video?

The new EOS M6, not surely FZ2000 etc. offer 5-axis image stabilization only when shooting video. Why is that?; I think it takes more processing power to do such thing in video mode though...
0
votes
1answer
428 views

What's the Largest File Size that PhotoShop CS 5.1 can Handle?

I'm building a large landscape montage using about 50 RAW images at 16Mb per image. I've successfully managed processing montages before that were 1.5 Gb but over the course of the few hours it took ...
0
votes
1answer
279 views

How to calculate image dimensions from camera parameters? [duplicate]

I'm using Raspberry Pi Camera v1 with the following parameters Sensor size: 3.67 x 2.74 mm (1/4" format) Pixel Count: 2592 x 1944 Pixel Size: 1.4 x 1.4 um Lens: f=3.6 mm, f/2.9 Angle of View: 54 x 41 ...
2
votes
2answers
447 views

Why my images get pixelated when I scale them up? [duplicate]

I'm a photographer, I usually edit photos through photoshop, lightroom. But when I try to scale the images it looks pixelated. I can't use the images for large banner or publishing. My camera model is ...
1
vote
1answer
541 views

Canon DPP 4 no longer auto rotates

Hi to all Canon Digital Photo Professional users out there. I have been using DPP for years with no issues. Recently I updated my install to version 4. Now, it no longer auto rotates photos taken in ...
31
votes
5answers
5k views

How was photo data processed and transferred back to Earth from satellites before digital photography became commonplace?

I am looking at pictures taken by some of the first satellites and landers there were like the Viking Lander on Mars in ~1976 or even the first image of the backside of the Moon in 1959 by Luna 3 I ...
1
vote
2answers
395 views

How to calculate digital photo precision based on camera specification?

I'm doing a project which involves analyzing an object's width from a photo with given precision of about 0.1 mm. I am to the point where I have to choose which camera to buy in order to obtain the ...
1
vote
5answers
240 views

What does the term “channel” mean in photography?

What is the definition of "channel" in photography? I know that there are "RGB channels", but what does that actually mean?
9
votes
2answers
286 views

How can I stitch images with the same center but different peripheral content?

Looking for help in solving this problem. I want to stitch a series of images together. The easiest way to describe it is, let's say, I am walking down a long street with a repeating pattern of ...
2
votes
3answers
436 views

Why are my RAW images already in colour if debayering is not done yet?

I recently went on a trip and took a bunch of pics with my girlfriends Canon Rebel. We shot in RAW, and now I am going to process the RAW images in DarkTable (my first time ever). I have read that ...
1
vote
2answers
454 views

Using rawtherapee to create an image like a DSLR camera in bracketing mode

Can rawtherapee can be used to create an image like a DSLR camera in bracketing mode? I noticed that rawtherapee has many controls under the exposure tab. I was told that just changing the exposure ...
10
votes
7answers
2k views

What would happen if a camera used entirely different primary colors?

So, as many people know, humans have three cones cells, enabling us to see three distinct "primary" colors, which may combine to form the entire spectrum that we are capable of seeing. Meanwhile, many ...
2
votes
3answers
97 views

How to do automated image analysis of astronomical photographs? [closed]

I have many pictures like the following: As many of you may recognise, this is a picture of Jupiter and its four Galilean moons. Using these images, I am aiming to calculate the mass of Jupiter by ...
2
votes
2answers
633 views

Are basic editing tools on Instagram fundamentally the same as those in Photoshop or Lightroom?

I shoot with a Canon DSLR (I usually shoot in JPEG cos I'm a noob) and like to upload good photos to Instagram. Typically this involves importing the images to my computer, uploading them to Google ...
0
votes
0answers
496 views

Skewness and Kurtosis in an Image

I am working with textures in an image. I have implemented algorithms to calculate the skewness and kurtosis in an image histogram. Great, delighted with that. I am using RGB as my color model. I know ...
0
votes
0answers
180 views

why is build DEM disabled in Photoscan?

I am trying to "Build DEM" in PhotoScan but the option is gray, it is disabled for some reason and I can't fix it. Can anyone help?
0
votes
1answer
326 views

Why gamma curve is applied in cameras?

I am tuning ISP(image signal processing) of one chip used in cameras. Gamma curve is used in the pipeline. I don't understand the reason. The CCM(Color correction matrix) will map images to sRGB color ...
0
votes
1answer
1k views

How to remove fisheye in PhotoScan Pro?

I am trying to build a 3D model of a site in CA using Photoscan Pro. The images were taken by 3DR solo drone GoPro camera. I need to process the image in Photoscan, however, I am having trouble with ...
0
votes
2answers
106 views

correct lens distortion and angle of view for scanning large planar objects

I made some pictures of my inner panels of my van (VW T5) because I would like to convert them to a vector graphic. My intention is to use the data in order to produce my own CNC cut spare parts. I ...
1
vote
2answers
214 views

Sum of pixel values more than incident photons

I'm getting efficiency more than 100% for my camera in ISOs higher than 6400. Under what circumstances does one get more pixel values than the number of incident photons (photon detection efficiency ...