It's a bird

by Vian Esterhuizen

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15

I think the main problem is one of dynamic range, your algorithm is probably right but you're working on the wrong type of data. A point lightsource that would otherwise clip and go pure white gets spread over a larger area by a defocussed lens, so that it forms a disc that isn't as bright and therefore doesn't clip. That's why you get those nice circles ...


8

First of all, in optics, only light adds up and darkness does not. Make sure that your algorithm does not bleed dark pixels outwards their original location. Resulting pixels should rather resemble maximum of nearby source pixels than average. Or, to be even more exact, you'd be summing up logarithms of affecting source pixels. Another possible cause why ...


3

Building on Romeo's answer: You can use imagemagick to convert to HSV color space and get statistics on the color distribution. HSV means Hue, Saturation, Value For a true grayscale image, saturation must be constantly zero. You can use the following command: identify -colorspace HSL -verbose <infile> and obtain something like the following ...


3

You could start by converting the image to grayscale and compareing that to the original image. If the image is already black and white, you'd expect the two images to be very similar; if it's full color, you'd expect them to be different. Clarification: Given the two comments below, I think I wasn't clear enough here. Certainly, the grayscale version of a ...


3

Your understanding was incorrect. See this article from 2012. If you state this bluntly: "Today (2015) all current browsers and major platforms themselves are all color managed." - then this is incorrect. It requires color management turned on (E.g. Win7 Basic mode turns it off), color management steps have been done (video card/monitor supports it, ...


2

I have been scouring the 'net for info on connecting to my brand new fuji x-t10 from Linux, but have come up completely empty-handed. I tried sniffing the connection (I installed a packet sniffer on my phone), and what I've come up with so far is that a tcp connection is made from the phone to 192.168.0.1 (which is the camera) on port 55740. It appears to ...


2

What really matters is your goal. What image do you want to create? You haven't said anything about that. a pro's tool ain't your tool, necessarily tool of HDR pros A "pro" chooses the right tool to get the job done. Pros might choose to use anything between a large format camera, 35mm flagship DSLR and a Polaroid camera for a paid job. Are you ...


1

With imagemagic you can use command identify to get info about the image identify -verbose image.jpg From the output you can check for standard deviation of red, blue and green. For grayscale images the should have very close values (theoretically equivalent values) P.S. You can check also this site for some scripts for such tests


1

Digikam has an SQLite database. I am not an SQL expert, but such databases allow for powerful search operations. While I do not have a direct answer, I am hoping the following avenues of research will be helpful. First start with Digikam's advanced search feature. Start with Browse->Search and activate the "Advanced Search ..." menu. Select the criteria ...


1

Darktable (which you can download for OSX here) is probably the software that comes closest to what you are looking for. The workflow still has some rough edges, compared to Lightroom or Aperture, but quite usable especially if you are looking for a scripting interface.



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