Shadowy Daisy

Shadowy Daisy
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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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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 ...
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3answers
1k 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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2answers
2k 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 ...
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1answer
164 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 ...
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1answer
348 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 ...
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2answers
178 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 ...
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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. ...
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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 ...
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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 ...
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2answers
683 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 purchase/...
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0answers
42 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
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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 ...
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0answers
372 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 ...
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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. ...
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3answers
280 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
523 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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1answer
73 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 ...
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2answers
346 views

How is data in a camera's colorspace transformed into XYZ or a standard RGB space?

I have a canon 600d that says it uses sRGB. How is this even possible without having the same spectral sensitivity spectrum as a standard observer? It is possible to define the matching functions of ...
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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 ...
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4answers
1k 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 photos ...
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1answer
179 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 ...
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3answers
347 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 ...
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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?
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3answers
137 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 ...
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1answer
413 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: ...
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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 ...
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1answer
55 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?
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2answers
97 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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1answer
200 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 ...
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1answer
310 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 ...
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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 ...
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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 ...
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1answer
134 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
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 ...
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2answers
361 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
589 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
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1answer
516 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
71 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 ...
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0answers
22 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?
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1answer
74 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
46 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 ...
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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 ...
0
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1answer
499 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 ...
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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?
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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://...
0
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1answer
121 views

What is the color structure histogram and how does it work?

What is the color structure histogram and how does it work
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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) = focal ...
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2answers
403 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 ...
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5answers
272 views

What photograph-manipulation application matches my specific feature wishlist?

Thanks to the new digital photography era, my computer is flooded with tons of photographs (like most photographers). I'm looking at a software having the following characteristics ( one software ) ...