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#apertus IRC Channel Logs

2016/10/07

Timezone: UTC


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se6astian|away
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08:01
Bertl_zZ
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08:01
Bertl
morning folks!
08:03
comradekingu
morning, on this day we must attain a lower position
08:28
aombk2
what does this mean?
08:59
Bertl
probably that all the higher positions are already gone :)
09:00
comradekingu
gotta get down on friday
09:00
comradekingu
pardon the pun, pardon the pun
09:04
aombk2
i dont understand, friday is basement maintenance day?
09:18
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09:19
philCeee
hey folks..
09:19
philCeee
thanks for the answers - sorry for my "just dropping in once a day" visits
09:20
philCeee
currently no time for office
09:20
philCeee
and irc logs are so comfortable
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se6astian
no worries :)
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Bertl
off for now ... bbl
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Bertl
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circ-user-1QZIk
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philgrandeC
i am gone - bye
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14:27
niemand
heyho, here sebastian (lww/bba/c3w)
14:27
Bertl_oO
hey
14:27
Bertl_oO
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14:27
Bertl
how's going?
14:28
niemand
currently not working with it, but was quite straight forward :)
14:29
Bertl
good to hear!
14:29
Bertl
so I take it, that it will work for your purpose?
14:29
niemand
for testing, i know what I need to do
14:30
Bertl
okay, great!
14:31
niemand
for production we need e.g. white balance
14:33
Bertl
there are several lookup tables which can be used to adjust the live HDMI feed
14:34
Bertl
there is no 3D lut available at the moment, but we haven't had any problems with the linear LUTs plus matrix yet
14:34
Bertl
but there is also no dedicated software (yet) to do the magic
14:36
niemand
Is this the "automate HDMI calibration" item on the TODO list here: https://wiki.apertus.org/index.php/Factory_Calibration#TODO
14:38
niemand
so there's no software to apply LUTs to an hdmi output?
14:39
Bertl
there is software to configure the LUTs but there is no software to 'guess' LUTs from 'desired' outputs
14:39
niemand
ah
14:39
Bertl
https://wiki.apertus.org/index.php/Axiom_Alpha_Software#Image_Pipeline
14:40
Bertl
this is the image pipeline, which is basically the same for Alpha and Beta (except for the final HDMI side)
14:40
Bertl
so first, there are the linearization LUTs (for sensor correction) and the FPN correction
14:40
Bertl
then it goes to memory (what you get if you do a snapshot)
14:41
Bertl
this data is then mapped via a 4x4+4 color matrix (you can configure that as you like)
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14:42
Bertl
and modified by 4 linear LUTs to handle gamma and whatnot
14:42
Bertl
the HDMI encoder part is missing in the Beta, as we directly output HDMI there
14:43
Bertl
so currently the 'look' for the HDMI output is controlled by the matrix and the gamma LUTs
14:43
Bertl
(note that the gamma LUTs do not need to be gamma related, they can be anything working on a single channel)
14:44
Bertl
so if you want to do white balance, the best way is to take a snap, calculate a transformation (matrix + LUTs) and upload that to the FPGA
14:44
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niemand
are there docs for this?
14:45
Bertl
note that you can take snaps during live view, so it even can be semi-automated
14:45
Bertl
@docs: not yet, but help is welcome :)
14:45
niemand
I can test it^^
14:46
Bertl
the wiki page I linked describes the pipeline and the math as well as the tools
14:47
Bertl
there are a bunch of (shell) scripts which set the registers
14:47
Bertl
but that can also be done via python or C
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Topic
apertus° - open source cinema | www.apertus.org | join the apertus° Lab: http://lab.apertus.org/ | IRC Logs available at: http://irc.apertus.org
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23:33
Bertl_oO
off to bed now ... have a good one everyone!
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