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by Preamp
Mon Jun 09, 2014 5:08 pm
Forum: Camera board
Topic: RAW output information
Replies: 236
Views: 98842

Re: RAW output information

@poing did his shot without any lens, so there was nothing there that could have caused vignetting or CA. Because of that, the chief ray angle with which the light hit the sensor was basically 0° over the whole sensor area. On a sensor without any microlenses this would have led to a uniform illumin...
by Preamp
Sun Jun 08, 2014 9:21 pm
Forum: Camera board
Topic: RAW output information
Replies: 236
Views: 98842

Re: RAW output information

After some googling I'm pretty sure what we're dealing with here. I think it's a "Chief Ray Angle Correction" for the used lens. In other words: the microlenses on the outer sensels are shifted away from the sensel's center to compensate for the (probably huge) CRA of the tiny lens. You can read abo...
by Preamp
Sun Jun 08, 2014 5:05 pm
Forum: Camera board
Topic: RAW output information
Replies: 236
Views: 98842

Re: RAW output information

The raw image from Raspistill is without any processing (and that includes lens shading) applied. Always has been, always will be. And what causes the strange vignette in the picture I posted above? It does actually look a bit like IR, but why isn't it uniform? I couldn't find a separate hot mirror...
by Preamp
Sun Jun 08, 2014 3:20 pm
Forum: Camera board
Topic: RAW output information
Replies: 236
Views: 98842

Re: RAW output information

And will you be able to let raspistill put out the raw data without that correction already applied? That would be crucial to have a real benefit of the raw data and greatly enhance the usability (read hackability) of the cam! :geek:
by Preamp
Sat Jun 07, 2014 2:50 pm
Forum: Camera board
Topic: RAW output information
Replies: 236
Views: 98842

Re: RAW output information

Unfortunately the lens correction data is hardwired, too :( .
I unscrewed the tiny little lens and replaced it by a 35mm-SLR lens (58mm Helios 44-7). The results are awful - even the raw data is showing this strange colored vignette :cry: .
by Preamp
Sat Jun 07, 2014 11:40 am
Forum: Camera board
Topic: RAW output information
Replies: 236
Views: 98842

Re: RAW output information

Received my cam today (ordered it yesterday, wow!) and made some initial tests. First thing I noticed is that my cam seems to have a different bayer pattern. Raspidng uses BGGR, which works fine with the samples from John. My files, however, need GBRG to render correctly. Well, correctly is a little...
by Preamp
Sat Jun 07, 2014 8:39 am
Forum: Camera board
Topic: RAW output information
Replies: 236
Views: 98842

Re: RAW output information

John, you're a genius! :) There is a windows version of the DNG profile editor here: http://www.adobe.com/support/downloads/detail.jsp?ftpID=5494 Unfortunately it has some complaints about both of your MacBeth images. The one with the light background has a color cast in a gray patch and the one wit...
by Preamp
Fri Jun 06, 2014 6:52 pm
Forum: Camera board
Topic: RAW output information
Replies: 236
Views: 98842

Re: RAW output information

jbeale wrote:Are you talking about the code done by AlanD here? http://www.raspberrypi.org/forums/viewt ... 25#p362257
Yepp. Sorry, I got you confused :oops: .

How do you calculate a color matrix from your test shots? I'm not deep enough into color management to know how to do that...
by Preamp
Fri Jun 06, 2014 9:59 am
Forum: Camera board
Topic: RAW output information
Replies: 236
Views: 98842

Re: RAW output information

Are you guys saying that the CCM you have is better than the results you get using the internal one (letting GPU do all the work)? No, but it's better than the "1 0 0 0 1 0 0 0 1" used by raspidng. But what about the other way round - can you get the correct matrix out of the firmware so that @jbea...
by Preamp
Thu Jun 05, 2014 8:20 pm
Forum: Camera board
Topic: RAW output information
Replies: 236
Views: 98842

Re: RAW output information

That color matrix is working great! I've put it into one dng via hex-editor, but implementing it in the code right from the start should be even better ;) . Here it is again in plain text: 1,2782 -0,4059 -0,0379 -0,0478 0,9066 0,1413 0,134 0,1513 0,5176 And ready to be pasted via hex-editor: ee31000...
by Preamp
Sun Jun 24, 2012 11:02 am
Forum: General discussion
Topic: SD Card Benchmarks
Replies: 301
Views: 300754

Re: SD Card Benchmarks

Here are some more cards.
I chose the SanDisk ;) .
Regards, Lasse

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