Before the rush

Before the rush
by evan-pak

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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 ...
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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 ...
14
votes
3answers
3k views

Is it possible to print a photo so it can be mounted on a globe?

I'd like to transform an image so that it can be mounted on a sphere. I'd like to use an image of a map (see the One Piece world map on the image), but it could be anything. Here is a kind of Family ...
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 ...
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 ...
2
votes
3answers
71 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 ...
0
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0answers
86 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?
16
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7answers
7k views

Nikon RAW image processing in non-Nikon software

I love Adobe Lightroom, the workflow, the interface, the whole package. However, as a Nikon owner never did I manage to get the colors to look as good as after processing with Capture NX. No doubt ...
0
votes
1answer
75 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 ...
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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
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 ...
0
votes
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?
4
votes
5answers
719 views

What algorithms or example tools are there for denoising of images in Raw format?

I am trying to perform some post-processing of Camera Raw images captrued using my Canon EOS 450-D. I am using PS CS5 and GIMP particulary to remove noise which is present in images. My questions is: ...
0
votes
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 ...
16
votes
4answers
6k views

Can software auto-detect image focus?

I was wondering if there was any photo management software out there that could auto detect and "rate" images on how in focus they are. This comes up for me quite commonly when i am looking through a ...
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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 ...
2
votes
1answer
461 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?
20
votes
9answers
49k views

Where can I get free RAW files online for practicing with Lightroom?

I've downloaded Adobe Lightroom in order to learn RAW image processing. I want to practise on some photos that covers basic subjects (Histograms, HDR etc). Is there a good, free source of RAW images ...
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
152 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
294 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 ...
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votes
7answers
3k views

Other than the iMac, what's a brilliant display for my images?

When I started researching gear to start my photography passion I fell in love with the large iMac display. The large bright screen at the best buy was showing a sideshow if images that looked better ...
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 ...
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?
9
votes
5answers
5k views

What software should I use for converting fisheye photos to normal rectilinear photos?

Can you recommand me a software for doing this job? I shoot using Sigma 8mm lens and I would like to be able to obtain a normal image out of that. The camera is canon 550D.
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). ...
62
votes
15answers
57k views

What tools are available for RAW image processing in Linux?

I have been taking photographs with RAW format. What tools are available for working with RAW under Linux?
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 ...
3
votes
3answers
567 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 ...
12
votes
3answers
17k views

Is it possible to make a single still photo from a video?

The idea comes from the fact that in astronomy (amatorial), it's common to take videos from a telescope with a webcam and convert them into a single, less noisy picture. The principle is that of ...
5
votes
3answers
10k views

What software tool can I use to convert a photo to line drawing?

What's the best way to do this, using free software? I want to convert photos to line-drawings, maybe cartoons ...
0
votes
1answer
209 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 ...
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
468 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 ...
5
votes
3answers
3k views

How can I adjust the colour temperature of an image programmatically?

I'm wondering how to convert programmatically (i.e. with a programming language rather than an editor) from one colour temperature to another? If, for example, I make the assumption (and it's a big ...
6
votes
2answers
189 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
337 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 ? - ? ...
11
votes
3answers
3k views

Can I combine several low quality pics into one higher quality picture?

Is there an easy tool to combine low quality pics taken from a mobile phone, all of the same thing but taken within a few seconds interval from one another, mostly suffering from slight out of focus ...
1
vote
2answers
182 views

How can I convert a photo to a fixed palette with pre-defined weighted color proportions?

I am creating a physical mosaic from a photograph, where each mosaic tile will correspond to a pixel of the (scaled down) original picture. The problem is: my tile color selection is limited, with the ...