Spring 2012

Spring 2012
by ani

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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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3
votes
3answers
669 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
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
162 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
460 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
401 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
1k 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 ...
7
votes
2answers
325 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 ...
0
votes
1answer
121 views
1
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3answers
146 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 ...
5
votes
5answers
20k 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 ...
2
votes
4answers
233 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 ...
3
votes
2answers
123 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 ...
1
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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 ...
6
votes
4answers
31k 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 ...
2
votes
2answers
388 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 ...
4
votes
4answers
1k 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 ...
26
votes
4answers
1k 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. ...
2
votes
1answer
273 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 ...
0
votes
1answer
59 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 ...
4
votes
2answers
215 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 ...
3
votes
1answer
308 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 ...
4
votes
3answers
178 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 ...
1
vote
0answers
365 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 ...
0
votes
1answer
498 views

How can I differentiate an Original and Photoshop Image [duplicate]

May be this is a wrong place to question this. But, please allow me to ask at least. We have some photography event in our office. So, we have mentioned the rule of date capture (like photo must be ...
0
votes
1answer
412 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: ...
6
votes
3answers
7k 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 ...
7
votes
2answers
5k 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). ...
2
votes
1answer
156 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 (I'...
1
vote
3answers
217 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 ...
0
votes
3answers
106 views

How to erase ALL metadata associated with an image? [duplicate]

I'm looking for a way to get rid of ALL metadata associated with an image. What should I do?
0
votes
1answer
133 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?
7
votes
2answers
1k views

Where can I develop 110 film?

Where can I develop 110 film from my Pentax 110 SLR?
3
votes
3answers
7k 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
votes
1answer
404 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 screen,...
1
vote
3answers
992 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 ...
1
vote
1answer
124 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. ...
12
votes
4answers
9k 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 ...
7
votes
3answers
1k 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 ...
0
votes
0answers
28 views

Erase background from an image [duplicate]

I 'm interested about erasing backgroung from an image. Taking into account that I 'm an amateur, which is the best way doing this? I hade already tried with backgroung eraser tool http://...
1
vote
2answers
104 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 ...
1
vote
1answer
126 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 ...
0
votes
1answer
84 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
1answer
177 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 ...
8
votes
3answers
14k 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 below:...
1
vote
1answer
272 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
votes
3answers
336 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 ...
3
votes
3answers
2k 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
votes
1answer
94 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 ...