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#apertus IRC Channel Logs

2013/11/15

Timezone: UTC


23:28
philippejadin
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gcolburn
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02:23
FergusL
hi again here
02:33
FergusL
exciting backlog about profiling
02:34
FergusL
I can help as well !
02:34
FergusL
at least I'm willing too
02:34
FergusL
to*
02:35
FergusL
aren't the raw files enough right now ? that simply need to be dumped as greyscale images in "precise" formats
02:41
FergusL
troy_s: thanks for the Argyll links
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Sasha_C
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03:29
Sasha_C
Greetings everyone
03:30
Bertl
greetings!
03:38
gcolburn
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03:38
gcolburn
hello
03:38
Bertl
wb gcolburn!
03:39
gcolburn
I'm trying to work on the camera calibration
03:39
gcolburn
I think we are going to need a new shot where we can crop out the columns with the defects
03:39
gcolburn
on the left side of the sensor
03:40
gcolburn
looks like the defects go through half of the first column of patches
03:41
Bertl
http://vserver.13thfloor.at/Stuff/AXIOM/RAW/IT8_incand.png
03:41
Bertl
I don't think they cover any relevant area, no?
03:43
Bertl
i.e. if they confuse the software, a copy/paste should do the trick
03:43
gcolburn
true
03:44
gcolburn
there is a file that tells the calibrations software where the patches are on an IT8 chart. so if it looks at the overlapping defects the average would come out wrong
03:45
Bertl
yeah, so probably the best approach is to break it down into RGGB and simply fix the B by copy/pasting the 2nd block over the third
03:46
gcolburn
that could work
03:47
gcolburn
the software requires a debayered tiff though, so copy/paste could work
03:47
gcolburn
I'm getting stuck with an error from Argyll and haven't figured it out yet
03:49
Bertl
it might be looking for the markers on the leftmost white bar and above
03:52
gcolburn
it looks like its finding the patches okay
03:52
gcolburn
it outputs a diagnostic image with labels that should match up with each row/column
03:52
gcolburn
the error I get later is: "colprof: Error - Input file doesn't contain keyword COLOR_REPS"
04:00
Bertl
okay
04:03
gcolburn
i think I'll have to search through their source code to figure out what's missing. searching hasn't helped too much
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Sasha_C
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07:08
Bertl
off to bed ...
07:40
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10:25
FergusL
Hi here
10:26
se6astian
good morning
10:40
mars_
morning
11:10
se6astian
hi mars, are you approaching the finish line with your other i project?
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13:19
intracube
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13:30
Bertl
morning everyone!
13:31
Sasha_C
Good morning Bertl
13:32
FergusL
hello Bertl
13:32
intracube
hi folks
13:35
FergusL
did someone else took a look at the links troy_s posted here yesterday ?
13:35
FergusL
they are very interesting, about camera profiling
13:35
FergusL
starting from zero
13:36
[1]se6astian
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13:36
intracube
I didn't see the links FergusL
13:36
intracube
on a related note, can someone point me to a doc which explains the format of the .raw8/.raw16 files here http://vserver.13thfloor.at/Stuff/AXIOM/RAW/ ?
13:36
FergusL
<troy_s1> gcolburn: Here is another link using Argyll http://stephenstuff.wordpress.com/2012/07/06/digital-camera-profiling-with-raw-therapee-and-argyll-cms/
13:36
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[1]se6astian
changed nick to: se6astian
13:36
intracube
just curious :)
13:36
Bertl
http://stephenstuff.wordpress.com/2012/07/06/digital-camera-profiling-with-raw-therapee-and-argyll-cms/
13:37
FergusL
it's a binary raw file
13:37
FergusL
basically 16 bits values following each other
13:37
FergusL
for each pixel
13:37
FergusL
not debayered, of course
13:37
intracube
and as this is the raw data, it would follow the pixel layout of the sensor?
13:37
intracube
right
13:37
FergusL
yes
13:38
FergusL
it is padded, though
13:38
intracube
so twice as many green photosites as R, B ?
13:38
Bertl
yup
13:38
FergusL
yep
13:38
FergusL
I made a dumb python script that debayers and dumps to the format of your choice (almost anything)
13:39
Bertl
recent .raw8/.raw16 append the sensor registers at the end
13:39
FergusL
gcolburn also made one that dumps the raw to dng
13:42
FergusL
has anyone uploaded a good quality debayered 16bits tiff from the IT8 shot ?
13:44
Bertl
I don't think so
13:46
FergusL
hm hm
13:47
FergusL
I see there are also conversations about the cooling
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14:18
intracube
Bertl: sorry for the newbie question, what do you mean by sensor registers?
14:19
Bertl
the sensor has 128 registers to configure how an image is captured
14:19
Bertl
those are 16 bit registers, so 256 bytes are added at the end of newer .raw* files
14:21
intracube
ah ok
14:22
intracube
thanks
14:23
Bertl
you're welcome!
14:30
FergusL
might be useful to have a script that reads the registers off the raw files
14:31
Bertl
reading them can be done with dd, interpreting them would be useful
14:31
Bertl
but I suggested that a few weeks (months?) ago
14:32
FergusL
I could volunteer for this task
14:32
Bertl
if you like, give it a try
14:33
FergusL
but I thought there might be more exciting things to do right now, to help
14:35
Bertl
feel free to pick something more exciting :)
14:36
Bertl
in case somebody wonders: 'dd bs=256 skip=98303 if=<file.raw16>' will extract the sensor registers
14:37
FergusL
thanks
14:38
FergusL
seek(width*height*2,0) and then read(256) should do the same in python on the file
14:39
Bertl
seek is always a bad idea, because it requires a file
14:39
Bertl
i.e. doesn't work the unix way with pipes
14:39
FergusL
isn't it a file ?
14:39
FergusL
yes, doesn't work with pipes, unless it's wrapped
14:39
Bertl
it may be a file, but it might as well come from a pipe
14:40
Bertl
so you would need to create a temporary file which is ugly and unneccesary
14:40
Bertl
change the seek to a read and you're fine :)
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rexbron
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rexbron
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15:53
se6astian
time to leave the office
15:53
se6astian
see you
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16:41
intracube
FergusL: does the padding you mentioned only apply to the .raw16 files?
16:41
intracube
ie 12bit data padded to 16bit?
16:41
intracube
or are the 8bit variants padded somehow
16:42
Bertl
yep, the lower 4 bits on raw16 are zeroes
16:42
Bertl
i.e. the 4 LSBs
16:42
intracube
ok
16:43
intracube
and the bits are just truncated to fit the .raw8 format?
16:44
Bertl
yup, basically the 8 MSBs are the .raw8
16:44
intracube
ah cool
16:44
intracube
thanks Bertl
16:44
Bertl
np
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18:23
Bertl
off for a nap .. bbl
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20:20
FergusL
purely random, any idea what kind of wood are the Aaton cameras handles (cc troy_s, rexbron)
20:29
Bertl
back now ...
20:36
rexbron
FergusL: Walnut or Cherry I believe
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20:56
FergusL
it's indeed walnut, found a few reference for that
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rexbron
FergusL: is you code posted anywhere?
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