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by Bart Arondson

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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
191 views

RGB colour correction of CCD camera images [closed]

I've developed an application which is able to communicate directly with a CCD camera (unbranded and obscure) and I'm able to capture and store the image from this camera. When the image is first ...
3
votes
3answers
2k 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 ...
3
votes
2answers
540 views

Which colour space should I apply Image sharpening filter?

I am trying to apply a Image sharpening 2D filter kernel(Laplacian) on a Image in my proprietary Image/Video processing pipeline(From Camera raw to final JPEG/MPEG). I plan to perform 2D convolution ...
3
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5answers
8k views

How to get creamy skin tone in Lightroom

I googled some tutorials on "creamy lightroom", but most of what I found ended up turning my photos' skin tones too orange, too "vintage". I tried desaturating Orange to counter this, but the ...
3
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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 - ...
3
votes
3answers
477 views

Easiest way to auto-align a stack of images? [duplicate]

I am working on my own "everyday face" project - taking pictures of myself to combine them in a sequence afterwards. I'm wondering what is the easiest and fastest way to align all pictures so my ...
3
votes
1answer
415 views

Which postcard mailing services are the best?

I have noticed several sites offering to let me upload a photo, some text and an address. They will then print a postcard with the image and my text and mail it for me. Some offer smartphone-apps and ...
2
votes
1answer
190 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 ...
2
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2answers
128 views

What is subpixel sharpening?

What does sub pixel radius sharpening mean in this review of the Pentax K5IIs mean?How does it differ from regular sharpening? Now this is the same raw file, with a 301% .3 sub pixel radius ...
2
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2answers
149 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 : ...
2
votes
1answer
2k 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 ...
2
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1answer
78 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 ...
2
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1answer
121 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
votes
1answer
75 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 ...
2
votes
1answer
421 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 ...
2
votes
1answer
295 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 ...
2
votes
1answer
102 views

Recommended settings in Lightroom 5 when exporting to NIK / other plugs as TIFF?

When exporting to NIK or any other plug, Lightroom asks for some information. AFAIK, and the more I study the less I know, the exported file should be a TIFF (no good options there), ProPhoto RGB ...
2
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1answer
166 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 ...
2
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1answer
310 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 ...
2
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1answer
148 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 ...
2
votes
1answer
680 views

How exactly do RGB curves work and interact w/each other in Photoshop?

So I understand how a single curve works: If you create a curve such that R100 (in) becomes R50 (out), every pixel that has an R value of R100 becomes R50. Similar deal with the RGB curve: if you ...
2
votes
1answer
69 views

How to open a raw file in camera raw in the correct image aspect

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 ...
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2answers
248 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 ...
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3answers
63 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 ...
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2answers
92 views

Flat fielding an image with two 1-D arrays

This is more of a math questions, but I thought I had a better chance of finding a camera enthusiast with a math background here. I've always flat fielded images using a two dimensional array with a ...
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3answers
296 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
308 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 ...
1
vote
1answer
85 views

2 Images, same object: tone difference and alignment [duplicate]

I would like to know a software which helps in post-production to calculate the general color/tone difference of 2 images. The images contain the same object, but arn't shot from the same position. ...
1
vote
1answer
111 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 ...
1
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1answer
141 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 ...
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2answers
540 views

Raw Captured Image processing

I intend to take raw images using a Canon which gives *.CRW and DNG format raw images. I have below question regarding processing of those raw capture 1] What all tools(I am ready to ...
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3answers
270 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 ...
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4answers
467 views

What color system best differentiates Yellow/Red/Black? [closed]

I'm working on a image processing system to segment three different types of pixels that are more or less Yellow/Red/Black. Now my question - which I though it's best to be asked here - is that which ...
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3answers
166 views

Can you take a picture of a faded docket and see the details again in computer?

Hi I have a very faded docket, where I can still read the details with bare eyes, but when I tried to photocopy and scan it, it just gave me a white docket. My last hope is using a camera. Please tell ...
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4answers
173 views

Seeking a way for “authoritiative”, proven method to prove that two photo images are “nearly identical”?

In usual discourse, when looking at an photographed image (A) - which is a JPG - and a slightly photoshopped version of it (A2), most people can intuitively compare the two and visually assess that ...
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4answers
763 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 ...
0
votes
1answer
103 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 ...
0
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3answers
316 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 ...
0
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2answers
161 views

What is Lightroom *really* doing when I change a Camera Calibration?

What does LR / ACR really do when a user changes the Camera Calibration setting? Here's Adobe's statement (for LR4, but I didn't find a newer one and there's no reason for this to change): Lightroom ...
0
votes
1answer
122 views

What is the best way to resize a high-DPI image for use on the web and in mobile apps? [duplicate]

I've been given an image (I'm guessing straight from a camera) and it's currently at at 240 pixels per inch. It's been a while since I did much Photoshop; I have three questions for two requirements: ...
0
votes
1answer
34 views

Programming curves tool how to work with RGB (combined) channel

I'm working on a Curves tool and i need to adjust all three channels at once using one curve. (RGB Curve) Internally, the class i created for the counting gets a set of control points the curve ...
0
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1answer
52 views

Image bending? Light bending? [closed]

Anyone know how to project an image onto a curved wall but still make the image appear as though its on a flat surface?
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1answer
67 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
votes
2answers
208 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 ...
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2answers
394 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? ...
0
votes
1answer
487 views

How is colour balancing performed in post processing of raw images

I had asked a question previously here which though not duplicate but is related to this. Asking this one as I feel it is different. My question is basically related to colour balancing/colour ...
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0answers
56 views

What is the difference between edge detection, Sobel detection, and Canny detection?

What is the difference between edge detection, Sobel detection, and Canny detection
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0answers
20 views

Adding blurred border to image using GraphicsMagick [migrated]

How can I add a border of 100px to all sides of a jpg that is made up of the perimeter pixels stretched out and blurred? e.g. the border to the left of the image is just columns 1-3 stretched ...
0
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1answer
46 views

Weighted conversion to a fixed palette

for some reason I need to convert a picture to a 16-color palette. While the conversion itself is nothing special, I need the final result to stick to a well-defined color proportion. This means, for ...
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0answers
87 views

How can I automatically square-crop an image?

I have a large number of photos that I need cropped into squares, the thing is I want to crop them "intelligently" so I don't end up cropping through someone's face if tha isn't necessary. Are ...