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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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1answer
122 views

Long Exposure Photo vs. Video [duplicate]

If I want to make some cool photos with long exposure times but not having a good camera that allows me to define the time, can I get the same result recording a video and make the superposition of ...
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3answers
632 views

How does the spectral sensitivity of different sensors affect the resulting photo?

I am learning about light and color formation but I don't understand how does the sensitivity affects an image. Take for instance the different sensitivities for two "cameras" for each RGB channel ...
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1answer
80 views

Slicing articles from a photo or pdf newspaper page [closed]

I have a pdf file which is a pdf format of a newspaper page that has many articles(image + text), same as the articles we find in the newspaper that newspaper vendor drops at our place everyday. I ...
0
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1answer
145 views

What's the best way to remove discolouration of scanned photographs?

I'm got a batch of printed photos which I am scanning to store a digital copy of and possibly enlarge them for printing. I've scanned them at the maximum quality (600DPI) and saved it with the least ...
1
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1answer
209 views

How can I change the pixel data in a DNG while keeping all the metadata?

I am looking for some free tools that will let me easily process the pixel data in a RAW file (DNG or NEF) while keeping the metadata untouched. Are there any such tools? Use case: I am ...
5
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3answers
278 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 ...
2
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1answer
89 views

Are there any good “dispersion blur” image filters?

I would like to obtain an effect where pixels get spreaded locally. I tried to reproduce how such a filter would look, I hope you get the idea: before: after: Note: here I ran a blur, aded ...
3
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3answers
5k views

Is there any good method to invert a negative image (duplicated with a digital camera) in Lightroom?

I made some duplicates picture (of negatives) with my digital camera using a bellows and a repro-dia. The image is obviously in a negative format but in RAW. Is the invertion function exists in ...
2
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1answer
129 views

How to safely and efficiently remove frames of photo added by software?

How to safely and efficiently remove frames of photo added by software? I'm NOT talking about the physical frame, but the border/frame added by software such as PhotoShop. I'm particularly ...
2
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1answer
112 views

Is the 'mono' setting in smartphone cameras a form of grayscale?

In the description, my smartphone camera describes the 'mono' setting as being black and white, but it appears more to be grayscale - am I right in this assumption? Also, if it is grayscale, how is ...
3
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2answers
2k 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 ...
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2answers
294 views

What factors, asides from temperature, affect dark current?

What is an effective means of determining the average dark current/noise of a camera image sensor? My understanding is that this is type of noise is temperature dependent, what other factors may ...
2
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1answer
215 views

How can I export 16 bit tiffs with Mac OSX' imageing engine sips?

I'm playing around with Apple sips command. When I export a Canon raw file (CR2) to tiff via sips -s format tiff -out img.tiff img.cr2 the result is an 8-bit tiff, although the CR2 source is ...
4
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1answer
2k 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). ...
2
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1answer
590 views

If I want soft focus, should I get the Canon 135mm soft focus lens or do it in Photoshop?

I always read that when possible it's best to "get things right in camera" which I always aim for - so following that line of thinking, would it be worthwhile to get the Canon 135mm f/2.8 soft focus ...
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3answers
4k 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 ...
2
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1answer
386 views

Gamma loaders on Windows 7/8: necessary or not?

I noticed that some monitor profiling software (like X-Rite i1 Display Pro, for one example) install their startup gamma loaders under Windows 7. Back in the XP days we used those utilities to load ...
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4answers
8k 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 ...
0
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3answers
339 views

Would you use an online RAW image processing application? [closed]

I'm just curious, if there was a web-site/web-portal related to RAW image processing what features you would prefer to use on it: RAW image processing (from different Cameras) Implementing different ...
8
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2answers
1k 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.
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4answers
20k 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 ...
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1answer
2k views

How to calculate object's height in pixels from an image? [duplicate]

Possible Duplicate: Calculate object size when I have physical pixel size I am working on the following formula to calculate distance of object from camera: distance to object (mm) = ...
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2answers
463 views

Image overlay and processing [closed]

If I overlay an image( lets say A) with another image(B) using 50% transparency. is it possible to recover A without knowing what B is? Dose overlaying make it hard to extract the original content? ...
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 ...
2
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1answer
356 views

How can I control exposure via a smartphone API when lighting changes? [closed]

I'm trying to create a smartphone application on iOS/Android that uses image processing. I'm experiencing the following problem: when I am recording and a new object (mostly white) enters the ...
5
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5answers
392 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
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1answer
960 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
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1answer
433 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 ...
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2answers
279 views

some criteria when a filter looks good

I'm a developer who wants to figure out when a filter would look good applied to a given image. For example, I have sepia, solarisation and pencil filters. Okay, the perception will be very ...
18
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8answers
35k 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 ...
3
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3answers
590 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 ...
4
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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
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1answer
139 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 ...
9
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3answers
619 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 ...
12
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3answers
16k 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 ...
2
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1answer
152 views

Learning about photography algorithms [closed]

I'm very interested in learning about algorithms in photography (in particular processing photos). In addition to algorithms, I'm interested in learning about photo formats (probably RAW and jpeg the ...
11
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3answers
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 ...
6
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3answers
11k 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 ...
2
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1answer
198 views

What is the the product of two Fast Fourier Transfoms?

I am reading a book about image processing. I have found mention of a method for processing images. It is said that a special effect could be reached when we multiply two results of the Fast Fourier ...
25
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2answers
4k 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?
6
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3answers
1k 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 ...
2
votes
2answers
151 views

How does a glare arise in images?

I know am sounding dumb but i have not been able to find a correct definition of glare What are the reasons it props up into images For example am taking a photograph of a fruit in diffuse light : ...
0
votes
3answers
276 views

What settings do I have to use to take pictures like this one by S Dot B?

I am impressed by this photograph of hip hop artist Kid Ink by S Dot B photography: http://www.killerhiphop.com/wp-content/uploads/2011/03/Kid-Ink.jpg Can anybody tell me the settings for my Nikon ...
4
votes
5answers
18k 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 ...
0
votes
4answers
971 views

A beginner with post processing wanting to learn [duplicate]

Possible Duplicate: Any good tutorials for learning how to post-process images? Though I have been trying hands on photography for quite a while now, I want to learn post processing of ...
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 ...
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vote
1answer
338 views

How can I extract qualitative information from EXIF files?

I have bunch of EXIF files. I am looking for some heuristics to extract qualitative information such as if the picture is portrait or not, if the picture was taken in day or night, if the picture is ...
13
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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 ...
3
votes
2answers
2k views

How to achieve misty look and vintage colors like Jaime Ibarra?

How are the color tones and the misty look achieved in the photo below? Does the technique/s have a name? (Note: link is NSFW.) Link to image - ...
9
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5answers
4k 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.