Questions tagged [demosaicing]

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Advantages of complex demosaicing algorithms on images to be scaled down

Let's say I have a 20MP RAW image, that I know will be used scaled down. I can think of several reasons why I would know that for sure: it will be published on the web, it will only be displayed on ...
rockfort's user avatar
7 votes
4 answers
662 views

Can we improve phone cameras using separate sensors for each of RGB?

So I was reading all about the multi camera system on the new Huawei P20 Pro which really got me thinking about how we can use multiple cameras to improve image quality, especially in such a compact ...
Baseer's user avatar
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2 votes
1 answer
643 views

Is there a Demosaicing algorithm that discards the 2º Green pixel and produces a image without interpolation with 4x less resolution?

that is it takes each four pixels RGBG ignores one of the greens and produces a single pixel from the 3(RGB), with no interpolation.
Tito José Ferreira Figueiredo's user avatar
2 votes
1 answer
555 views

What demosaic algorithm is best for DNG to B&W conversion?

I figure that at some point someone has devised a demosaic algorithm that is optimal for converting a Bayer DNG to a B&W photograph. But what is that algorithm called, and what image processing ...
iSelfy's user avatar
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0 votes
1 answer
1k views

How do I demosaic my photos using Darktable?

I took a couple of photos and stuck them on Flickr with my Canon T5 (1200D). I took this picture using RAW+L to get a RAW & JPG image, and then compared the two. If you zoom in, you can see there'...
Wayne Werner's user avatar
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3 votes
3 answers
2k views

Why are my RAW images already in colour if debayering is not done yet?

I recently went on a trip and took a bunch of pics with my girlfriends Canon Rebel. We shot in RAW, and now I am going to process the RAW images in DarkTable (my first time ever). I have read that ...
Scorb's user avatar
  • 1,048
0 votes
1 answer
61 views

is it possible to retrace back to the values of intensities that have been captured by the digital camera from the image's RGB values?

One can use matlab to know the RGB values's data for all the pixels. But the camera captures the data by measuring intensities at each photodiode. These values are such that they correspond to one out ...
Ekdeep Singh Lubana's user avatar
9 votes
1 answer
3k views

When RAW files are converted to DNG, are any irreversible demosaicing happening or not?

I know this almost touches some other questions already asked here, but it's actually aligned a bit different. This is not about DNG vs RAW, rather just about the demosaicing step in the conversion. ...
Hugo's user avatar
  • 8,288
0 votes
2 answers
2k views

Demosaic data stored in TIFF

Is there a relatively easy to use tool that will allow me to demosaic some raw data stored in a TIFF file (not a standard raw file such as DNG, NEF, etc.), assuming a Bayer pattern? The TIFF contains ...
Szabolcs's user avatar
  • 2,883
5 votes
2 answers
2k views

What's the easiest way to access pure raw data (without demosaicing)?

What is the simplest way to access the data in a raw file before demosaicing and write it to a more widely supported file format (e.g. 16 bit TIFF)? I'm looking to obtain a single channel image where ...
Szabolcs's user avatar
  • 2,883
7 votes
1 answer
864 views

How can I insert my own demosaicing algorithm into rawtherapee or darktable's pipeline?

If I give Rawtherapee or Darktable a raw image, they will automatically transform the raw image using their internal pipeline to an output image. Let's say I have designed a new demosaicing ...
Daniel's user avatar
  • 173
13 votes
4 answers
13k 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 ...
Michael C's user avatar
  • 175k
13 votes
5 answers
5k views

Would a demosaic algorithm for black and white be useful?

Given that the main purpose of demosaicing is to recover colour as accurately as possible, would there be any advantage to a "black and white only" demosaic algorithm? That is, instead of first ...
Lars Kotthoff's user avatar
11 votes
1 answer
978 views

How does demosaicing work in Fujifilm's new sensor for the X Pro-1?

Fujifilm has an innovative new sensor layout for the just-released X Pro-1 camera, which they say is "inspired by the natural random arrangement of the fine grains of silver halide in film": Since ...
mattdm's user avatar
  • 143k
27 votes
4 answers
17k views

What are the pros and cons of different Bayer demosaicing algorithms?

Bayer sensors use a pattern of red, green, and blue pixels, and merge those together into a final color image, with one pixel for every single color sensor. This could be done through a "naive" ...
mattdm's user avatar
  • 143k