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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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50
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13answers
31k 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?
25
votes
2answers
3k views

How does exposure fusion work?

I understand that "exposure fusion" is a method for combining different exposures into a single image. How exactly does it work, and how is it related to HDR?
25
votes
4answers
729 views

What are Color Profiles and where would I find information on using them properly?

I see the term "Color Profile" a lot and I have this vague idea that it helps you adjust color values based on the unique differences of both cameras, displays and printers from some ideal device. ...
19
votes
5answers
7k views

How can I tell exactly what changed between two images?

For example, for a recent conversation about JPEG compression I wanted to compare pixel for pixel what changed between two JPEGs (one with compression level 100, and one with compression level 95). ...
18
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 ...
17
votes
8answers
26k 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 ...
15
votes
3answers
3k 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 ...
15
votes
5answers
5k 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 ...
14
votes
10answers
29k views

Cheap/free tool to view/convert Canon CR2 RAW format photo files on Windows?

Recently, my family had some professional photos taken while vacationing at a resort. The photos were given to us on CD in both .CR2 and .jpg formats. While we can view the JPEG-format versions of ...
13
votes
3answers
670 views

How would I go about using my SLR to measure the 'greenness' of a photo?

Background My digital pictures can be read into a computer program like Matlab or R as a m x n x 3 matrix where m x n is the number of pixels observed by each of the three (red, green, and blue) ...
13
votes
2answers
2k 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 ...
12
votes
12answers
865 views

What noise removal tools work best, and why?

Can anyone recommend some good noise removal tools, free and commercial? Should support RAW and JPEG. Are certain tools better than others in particular situations? Do some integrate better with other ...
12
votes
3answers
2k 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 noisier picture. The principle is that of ...
11
votes
6answers
1k views

Is post processing always necessary for best results?

While using my old Point and Shoot camera I used to think about post-processing photos in Photoshop like something unnatural, fake, and deceptive. But after buying DSLR I have not only to think about ...
9
votes
4answers
6k views

Why is a physical anti-aliasing filter still needed on modern DSLRs?

I understand the purpose of the anti-aliasing (AA) filter is to prevent moire. When digital cameras first emerged an AA filter was necessary to creat enough blur to prevent moire patterns. At that ...
9
votes
3answers
489 views

Is the image processor relevant in a camera when shooting RAW?

When cameras come out the company often states that the image processor is upgraded. Does such an upgrade matter when one only shoots in RAW? When shooting RAW the image is taken directly from the ...
9
votes
3answers
2k views

What is a quick way to restore old black and white and sepia photographs?

I have a bunch of old black and white and sepia photographs from my grandparents' album that I scanned and would like to restore. The photographs are generally in good condition. there are some ...
8
votes
2answers
796 views

How can I “focus peak” a photograph?

Does an application exist where I can input an image and then the application indicates what parts of the image are in focus? I imagine it as a sort of post-process focus peaking.
8
votes
4answers
3k 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.
7
votes
3answers
996 views

Process stereoscopic image to convert from 3D to 2D

I am wondering if it is possible to take a stereoscopic image and sum them in such a way that makes it a monoscopic image, with the resulting viewpoint in the center of where the two viewpoints ...
7
votes
2answers
2k 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 ...
7
votes
2answers
1k views

Where can I develop 110 film?

Where can I develop 110 film from my Pentax 110 SLR?
6
votes
4answers
2k views

Should I save an image as png, jpeg or bmp?

If I edit an image file using some application like Gimp, Photoshop or MSPaint, while saving I will be asked to select the required file-format. There are different formats available, the common ones ...
6
votes
3answers
287 views

How much does in-camera image processing affect noise on Canon DSLRs?

I've found out that some of photos take with my 5D MkII have more shadow noise than I like. I know there are some obvious settings that affect this, such as ISO a noise reduction settings. But there ...
6
votes
2answers
1k views

Is “saturation” an image-processing concept?

Image saturation is a concept used to describe the purity or intensity of color in an image, such that an image with very little saturation approaches a black and white image. Pink, then, is said to ...
6
votes
2answers
214 views

Red Haze across right and top of photo

I take a photo with the cap on, set to shutter priority mode and set to 30s. After photo is taken and the NR job runs, I end up with a black picture and a red line/haze down the right side of the ...
6
votes
4answers
793 views

What kind of process is this old photo in glass?

I have 2 old (circa 1800?) black and white photos sizes 9x11 inches in glass. It's a picture of a little girl in a flower field and another of a woman outside the home, sitting on a chair with her ...
6
votes
2answers
4k views

What workflow should I use for processing RAW photos in Lightroom?

I started shooting in RAW, and I use Adobe Lightroom. What workflow would you recommend to use for the processing? I will really appreciate a detailed description of the steps (or a link to one). ...
6
votes
3answers
8k views

How to analyze images with Fast Fourier Transform method?

I am learning about analyzing images with the method of FFT(Fast Fourier Transform). The image I am analyzing is attached below: And the result of the FFT analysis of this picture is presented ...
6
votes
1answer
168 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 ...
5
votes
5answers
361 views

Object size discrepancy in image (Round object occupies more pixels than it should)

I am photographing a sphere (a ball): in the same picture I have also placed a ruler. The ball and the ruler are in the same plane. i.e. the ruler is placed such that it is aligned with the center of ...
5
votes
3answers
226 views

Creating one photo with multiple rows as if one is head-on to each row?

I took a picture of a crescent arch with scaffolding (apparently for maintenance) but can't post it for lack of "10 reputation." However the effect is simple, in that from the vantage point, the row ...
5
votes
4answers
12k views

How to batch process images retaining them as PNG in Photoshop?

I need to optimize 700 images in PNG in a batch process, but Photoshop only gives me the option to optimize the images and export them to JPG, when I want to mantain the images on PNG. Is there a way ...
5
votes
1answer
521 views

How can I improve the results of my proprietary RAW processing pipeline?

I am doing some experiment with Raw image processing using two post processing tools: Adobe PhotoShop (PS) CS5 Proprietary Image processing pipeline code. Data Capture: I captured some raw ...
5
votes
1answer
916 views

Lightroom 4.1 HDR (From other source than Photoshop)

I'm trying to use the new feature of lightroom 4.1 that allows us to edit 32bits floating point tif directly within Lightroom. The workflow seems easy enough when you have Photoshop but I do not. I ...
4
votes
3answers
3k views

How can I resize Raw images and store them back in the original format?

I have some raw images captured using Canon,Nikon,Minolta cameras.(*.CR2, *.NEF, *.MRW) I want to change resize them and store them back as the original format. I checked in two tools, Canon ...
4
votes
3answers
2k views

Is “Active D-Lighting, NR” a necessary evil?

Are the settings "Active D-Lighting, NR" in Nikon DSLR necessary evil or should this be turned off (managed through image editor)? What is the effect of this setting on processing time and battery ...
4
votes
5answers
16k views

What is the difference between Adobe Photoshop and Lightroom?

I have been using Adobe Photoshop for years. I even use Illustrator for vector work from time to time. Then along came Adobe bridge and it seems to be an attempt at a better way to browse, sort, and ...
4
votes
4answers
538 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: ...
4
votes
2answers
178 views

What, technically, is happening when one adjusts the 'Exposure' setting in a raw editor?

Since the photograph has already been taken by the time it is being edited, 'adjusting the exposure' of a RAW file must have a specific technical meaning (which I have struggled to find) Can someone ...
4
votes
3answers
124 views

Superimposing photos and thermographic images

I have two cameras: one is a "visible" camera and the other one is a thermographic camera, which, as many of you may know, it is a camera that captures infrared radiation instead of visible light. I ...
4
votes
1answer
949 views

Can I convert raw files to TIFFs via the command line using Apple's converting engine?

I want to convert from the command line a bunch of RAW files into tiffs using the same converting engine as Apple's Aperture or Preview (in order to get the same results as from these applications). ...
4
votes
1answer
393 views

Understanding Hue, and is there something else I should be using?

I am trying to isolate objects of a certain color in an image. Looking at this image, you can see that I have extracted the hue channel, and have filtered these values so that the closer a pixel's hue ...
4
votes
1answer
1k views

Tablet Apps for Simple Processing of RAW files

What tablet Apps would you recommend for simple RAW processiong on a tablet? Currently using Samsung Tab 2, 7 inch tablet. My main concern is just open the RAW file and do some Cropping and upload ...
4
votes
1answer
134 views

Manipulating images at different spatial scales

Is there software which will allow manipulating an image at different spatial scales? For example, change the contrast or brightness of features smaller than 50 px but larger than 10 px. I have ...
4
votes
4answers
608 views

Query about gamma correction?

I have a bespoke Image Capture & processing flow, wherein I do the following operations:- Capture Raw data-->De-Bayer(Get RGB)-->Color Balance-->RGB-to-YCbCr-->Image sharpening-->Denoise ...
3
votes
3answers
550 views

Photo Processing - What am I doing wrong?

I seem to have a problem processing photos and I am not sure where I am going wrong. The issue is on my desktop monitor the photos look great. Overall vivid color, brightness, contrast etc. When I ...
3
votes
2answers
766 views

What does “frequency” mean in an image?

I don't understand how frequencies are defined in images/photographs. As far as I understand it now, high frequencies are like sharp things in images, like edges or so, and low frequencies are kind of ...
3
votes
3answers
1k views

Why do I have to convert RAW files to JPEG to open them? [duplicate]

Possible Duplicate: How do I get started with RAW photography? I am a new to RAW shooting and recently bought a Nikon DSLR. I find that only the software which came with the camera can open ...
3
votes
2answers
113 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 ...