Spring 2012

Spring 2012
by ani

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-1

My experience with photo imaging allows me to conclude that the filters used must mimic the tried and true “Three-Color” filters traditionally used on the film camera. These are the Wratten #25 Red – Wratten #58 Green – Wratten #47B Blue. The Wratten numbers are come from the catalog of the master filter maker Frederick Wratten of the London firm of Wratten ...


1

The type of mosaic which tyou are talking about is RGBW. Telling about why it is not used is complex and I may misinform you. I may point at least one thing which in my opinion is most important. So, my question is, what is the main reason we don't see products containing the alternative color filter described above? Every channel of output image is ...


4

thus there must be a certain specific peak wavelength for all the three Not it must not. 1) The spectral sensitivities may have two or more extremums with IR filter removed. 2) Colorimetry does not require the cameras to have the peak sensitivities at specific wavelengths. The extreme example of it is LMS colour space which simulates the human cone ...


2

Only if you still have the original data from the raw file. You cannot normally derive the original monochromatic luminance values from each sensel (pixel well) on the sensor from the demosaiced data because there are almost always more than one set of original data that could result in the same final RGB values, just as there are more than one set of RGB ...


0

If you want to do "astro-photography" , spend your money on the telescope and tracking gear. The camera is almost incidental by comparison. While a grayscale CCTV camera may be cheap, it'll also have crappy resolution and lousy signal/noise ratio. Even with the loss due to the color filter, almost any consumer digital camera will be better. it'll be ...


12

The Bayer filter passbands are designed to be make the sensor have a reasonable match to the human eye, while not costing too much. They're fairly leaky even in the visible part of their stop band, and pretty much uncontrolled in the IR. To increase their blocking in the IR a more expensive recipe in a thicker layer would be needed. The thicker layer isn't ...


2

pixel has different meaning in spheres of display technology and sensor technology. pixel of RGB Bayer sensor is represented by only one number (roughly one colour) while pixel of most of RGB graphic displays is represented by three numbers. The number of pixels noted on cameras is not the number of dots divided by four - it is actual number of dots on the ...


3

Basically, a RAW file stores data directly from the sensor of your camera. Most DSLR are using what is called a Bayer filter (https://en.wikipedia.org/wiki/Bayer_filter) to retrieve information about color. Usually, for 4 "pixels" (sensitive elements), 2 are used to get information about green, 1 for red and 1 for blue. However, keep in mind that this sensor ...



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