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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).

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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
70 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
153 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
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0answers
85 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
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0answers
24 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
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1answer
74 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
102 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
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2answers
47 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
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2answers
181 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 ...
0
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1answer
67 views

What type of images can be created from cameras built using cambits?

Basically I am not very much knowledge in Photography. But I want to know What type of images can be created from cameras built using cambits?
0
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1answer
76 views

Batch image resizing [duplicate]

Does anyone know of a tool that can resize a batch of images to the largest size that keeps each one under a specified file size (preserving aspect ratio)? This would be very useful when uploading to ...
0
votes
3answers
147 views

Remove or reduce blur in an image

I have a photo of some text that is blurry and so I can't really read it (I have glasses and it hurts my eyes when I try). I Googled for a tool to reduce blur, but without much luck. Is there a way ...
1
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0answers
44 views

NDVI without filter [closed]

Is it possible to create an NDVI heat map from an image that has been taken without a blue filter being used? The images were taken using the NoIR camera on the raspberry pi. Thanks
1
vote
2answers
98 views

Why does the Canon 450D have only 14bit depth RAW images?

According to 3.4.2. section "data precision" on this website, the Canon 450D has 14bit deph. Canon CR2 stores RAW data as JPEG Lossless format. Image size: 4312x2876 CFA: 4313x2877 (bayer sensor ...
1
vote
1answer
60 views

How can I resize PNGs so that an internal selection matches specified dimensions?

I'm using Photoshop, though any image program that can handle this issue and PNGs with transparency I would be open to. I have a multitude of images of picture frames right now, but they are ...
0
votes
1answer
57 views

Adjusting highlights, shadows, etc in LR [duplicate]

There are two areas in LR when you develop your image where you can adjust these parameters, one in the curves section and one overall I think. What's the difference and when should you use which?
1
vote
2answers
402 views

Why doesn't PNG show more detail than JPEG in a converted NASA image?

I have a really limited knowledge of photography, so, bearing that in mind, here is my problem. I downloaded an IMG file with a separate label file from NASA PDS because I wanted to visualise the ...
1
vote
1answer
150 views

Bulk processing make images square no cropping

I have hundreds of product photographs for my business. Now am assigning all of those to respective product codes on my ERP. But the erp accepts only square images (1:1) something like instagram or ...
4
votes
3answers
293 views

Is there any way to fix the wavy lines that appear when photographing a striped dress?

Is there any way to fix the wavy lines that appear when photographing a striped dress?
0
votes
2answers
99 views

Image from Leopard Imaging M021 camera looks green in Matlab,need to convert to RAW [closed]

I am getting image from Leopard Imaging M021 camera in Matlab. Each frame is of size 720x1280x3. The video object shows the image is being extracted in YUY2 manner. Same was told by Leopard imaging ...
2
votes
2answers
141 views

Are deconvolution filters better than unsharp mask for correcting out-of-focus photographs?

What is the best method for enhancing image quality if a photograph happens to be out of focus? I'm using now unsharp mask but I'm looking for new methods. Perhaps there is one which has better ...
3
votes
3answers
195 views

What are similarities and differences between raw editing and film developing capabilities?

Raw images are supposed to be detailed output from the camera sensor(s), with more details that what can actually be printed or displayed on a screen. Effects like exposure compensation or white ...
2
votes
2answers
113 views

Why does frame stacking alter colours?

I apologise in advance for the subject matter of my photos. I've not tidied the table for a few days. I needed indoor artificial lighting for the long duration of this experiment. Both images are ...
5
votes
1answer
70 views

How to minimise the noise in colour values when moving between colour spaces?

Let's say I was to change from RGB to HSV using a software like Matlab and then convert the result back to RGB using the same software. I know that there are going to be some slight noise and error in ...
3
votes
1answer
382 views

What are the anomalies in this picture of earth?

I was playing around with the New NASA pic of earth (posted July 20th 2015 on Nasa Goddard space flight center on Flickr). I've found this very odd structure on the bottom right corner that is pretty ...
3
votes
3answers
149 views

What education or certifications are needed to get work as an image processor or photo retoucher?

I am thinking about seeking employment in the area of photo retouching and image processing. What education or certifications would be good to help make this happen? And what online resources are ...
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3answers
3k views

How can I batch process HDR images in Lightroom?

I have taken a series of 8 images for a 360 panoramic shot using bracketed exposure of 3. This produces 24 total images, which I would like to process in lightroom using HDR merge. Currently, I am ...
10
votes
2answers
551 views

What algorithm can I use to simulate bokeh?

I am attempting to write a script that loops through each pixel in a photograph and applies a bokeh to the image as a whole. I built a script based off this link, however that seems to be a hack. I ...
3
votes
1answer
465 views

Is there a technique for combining multiple images to create a sharper result?

I've been experimenting with photogrammetry for a while, and the main hurdle I keep tripping over is the clarity (lack thereof) of my images. Rather than spend a lot of money on a better camera, I'm ...
2
votes
1answer
459 views

How do I convert a single spherical distorted image to a rectangular image?

How can I convert a single spherical distorted image to a rectangular image?
2
votes
2answers
295 views

What is the difference between HSV and CIE-Lab color space?

When do we (or should we) use HSV color space and when do we use CIE-Lab color space?
0
votes
1answer
208 views

What causes chroma noise in an image sensor

I'm trying to understand what is causing chroma noise in an image sensor, specifically why it is so visible when the ISO is set to a very high value (which for CMOS I guess means that there is an ...
6
votes
2answers
188 views

How does a camera artificially decrease DoF of a shot from a single position?

Some cameras with small sensors can artificially blur image background provided there's an object in the foreground. FujiFilm calls it Pro Focus filter. I'm not sure if the camera makes one or two ...
0
votes
1answer
335 views

Access “Pre-Bayer” RAW image to analyse channel values [closed]

First of all i 'm working with a Fuji Finepix HS50 EXR I'm doing an internship and my job is to collect photosite raw data to analyse phosphorescent paint comportment. To do so I need to access the ...
2
votes
3answers
232 views

What are the exact pixel values (or ranges) for shadows/midtones/highlights in Lightroom?

In lightroom, different sliders impact different pixel intensities. I'm looking for the exact values (or approximate ranges) of the various levels: blacks: 0 - ? shadows: ? - ? midtones ? - ? ...
3
votes
1answer
185 views

Can I extend dynamic range by underexposing and then downsampling (“binning”) my images?

In microscopy we often can sacrifice spatial resolution to collect more photons per pixel. Using sCMOS sensor and binning by factor of 2, we can get bump (up to 4x) in our signal-to-noise ratio (SNR). ...
0
votes
2answers
359 views

How is data in a camera's colorspace transformed into XYZ or a standard RGB space?

I have a canon 600d that says it uses sRGB. How is this even possible without having the same spectral sensitivity spectrum as a standard observer? It is possible to define the matching functions of ...
0
votes
0answers
34 views

An online service to create “photo stacks”? [duplicate]

I'm really not sure what the following is called (this isn't my image): The image was from here (not really relevant though). I want to create something like it, though. Is there a website for me to ...
1
vote
1answer
166 views

Does shrinking the upscaled picture improve its quality (in terms of blur)?

Take a look at the following diagrams: The original picture: The upscaled (2x, bilinear) picture: In both cases the first item in the first row is the input image. There is its 2d fft next to ...
0
votes
1answer
119 views

can you remove a hair on the image sensor in light room?

i took a series of pictures yesterday and discovered that shooting around f/13, f/16, there is what appears to be a hair located on the image sensor and is visible in the pictures where the lens is ...
3
votes
2answers
488 views

How can I detect upscaled photos?

I have a collection of JPEG photos, each 500 to 600 pixels on the longest side. How can I detect which ones have been algorithmically enlarged from a substantially smaller photo? An online ...
-2
votes
2answers
410 views

What workflow will speed up sorting photos stored on a NAS in OS X finder before import into Lightroom?

I have a DSLR camera; D7100 to be exact. I originally purchased it, because I was fed up with all the point and shoot cameras out there and wanted control over my photos. At this point, I'm wanting ...
3
votes
3answers
716 views

How can one correct intensity flicker due to AC line frequency?

Is there a good image processing method to get rid of the horizontal stripes in the images taken under fluorescent lighting? These stripes (flicker) occur when you take pictures indoors due to the 50 ...
0
votes
1answer
121 views

What is the color structure histogram and how does it work?

What is the color structure histogram and how does it work
1
vote
3answers
147 views

Utilities for comparing different JPEG compression engines?

I'm looking to do some statistical analysis on the effect on an image of various compression systems, with the end-goal of hopefully being able to determine which is a recompressed version of which. ...
0
votes
1answer
47 views

Retina Display-Can anyone suggest how to literally make an image “retina display”? [closed]

Can anyone suggest how to literally make an image "retina display"? I think it doesn't depends on the camera. Does their is any software for it? I want another suggestion. Can anyone suggest a ...
3
votes
2answers
124 views

How can I give an assitant rights to edit without having the possibility to download the image? [closed]

The situation is this one: we are a small photo company. We have a few people going out to shoot various assignments. When they return they hand me the memory cards and I download the images into the ...
7
votes
2answers
329 views

Does it matter what edge finding algorithm you use?

I was playing around with an action set that I have that creates edge masks using the Roberts, Robinson, Sobel, Prewitt, and Kirsh algorithms. Because of the differing levels of brightness, I decided ...
3
votes
3answers
564 views

How to open a raw file in Camera Raw full size rather than cropped to in-camera aspect ratio?

On a recent photography holiday I took a number of photographs using the in camera option to change the image size to, for example, 16 x 9. The native image size of the camera is 4:3. I transferred ...
1
vote
3answers
106 views

Convolution algebra and capture, creative, and output sharpening

I'm making the reasonable assumption that software implements sharpening via convolutions. Convolutions are both commutative and associative. So... why do we talk about capture sharpening, local ...