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#apertus IRC Channel Logs

2017/02/02

Timezone: UTC


23:24
davidak
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00:53
Bertl
off to bed now ... have a good one everyone!
00:53
Bertl
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arpu
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intracube
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se6astian|away
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07:37
Bertl_zZ
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07:38
Bertl
morning folks!
07:46
se6astian
hello!
08:05
davidak
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08:15
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08:39
Bertl
off for now ... bbl
08:39
Bertl
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08:46
Spirit532
has anyone here worked with LibTIFF?
11:49
jucar
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12:05
se6astian
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12:21
alexML_
Spirit532: only installed it to compile ufraw; but if you have a specific question, you may get better answers
12:21
Spirit532
I had a specific question
12:22
Spirit532
I now have another specific question
12:22
Spirit532
I am writing a DNG file, which is valid(opens in Resolve & PS)
12:22
Spirit532
but a few tools like RawTherapee don't recognise the color
12:22
Spirit532
in my case, the entire image just shows up either red, green, or blue, with 0 on the other two channels
12:22
Spirit532
am I missing a weird tag?
12:22
alexML_
dng_validate output?
12:23
Spirit532
... how would it not be valid if PS & Resolve open it?
12:23
Spirit532
>_>
12:23
Spirit532
that, and rawtherapee OPENS it(which means dng_validate is good), but the colors a re dead.
12:24
alexML_
... just like a HTML page can be invalid, even if it renders fine in some particular browser ;)
12:24
alexML_
RT does not use dng_validate, fyi
12:24
Spirit532
but resolve & ps do
12:24
Spirit532
at least PS does, certainly
12:24
Spirit532
since it's an adobe product lol
12:24
alexML_
PS is closed source ;)
12:24
Spirit532
so is resolve
12:25
alexML_
so you can't tell, unless you have reverse engineered them ;)
12:25
Spirit532
it's adobe
12:25
alexML_
so?
12:25
Spirit532
adobe would only use the adobe sdk to open dngs
12:25
Spirit532
lol
12:25
alexML_
yes, but sdk != dng_validate
12:25
Spirit532
think logically
12:25
Spirit532
why would it not validate
12:25
alexML_
why would it?
12:25
Spirit532
flawless logic right there.
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se6astian|away
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se6astian
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se6astian|away
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se6astian
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se6astian|away
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se6astian
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se6astian|away
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davidak
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niemand
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davidak
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18:06
intracube_afk
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20:22
GrahamM
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20:26
GrahamM
Anyone active?
20:41
Bertl_oO
I'm kind of around ...
20:48
danieel
Bertl_oO: back to the weird top of the imager.. have you ever thought that the blacklevel can degrade the usable area by 10-15% ?
20:49
danieel
i mean.. if you got a 10 or 12 bit ADC, it will clip way below the digital max
20:49
danieel
*area as in terms of digital output codes
20:50
Bertl_oO
hmm?
20:51
danieel
im working on the BAE sensor, and it wont subtract any of the black level on chip.. and it is quite high
20:51
Bertl_oO
you mean you are losing data because of a high black level>
20:51
Bertl_oO
s/>/?
20:51
danieel
previusly we did something with sony.. and there it was on chip corrected.. so i started to wonder, how can they produce full-scale digital out?
20:51
danieel
yes
20:52
Bertl_oO
well, I'm pretty sure the sensor has some way to adjust the analog offset
20:52
Bertl_oO
it might not be well documented or obvious though
20:52
danieel
in the Kodak DS they said its done in digital domain
20:53
Bertl_oO
but even if it does not, you should be able to adjust the gain (analog or in sensor digital) to bring the full sensor range into the bit depth you read out
20:54
Bertl_oO
of course it's a tradeoff between depth and range
20:57
GrahamM
Bertl, just regarding HDMI, I don't know much about the technical aspects of HDMI. The issue with compatibility, are you reacting to a non-conforming EDID and not outputting a signal?
20:58
Bertl_oO
no, the Beta currently ignores the EDID completely
20:59
Bertl_oO
it just outputs whatever you configure
21:01
Bertl_oO
i.e. when you configure 1080p60 and output it to your monitor/TV and then you swap the cable to the viewer, it will get exactly the same signal
21:02
Bertl_oO
the signal itself is configure by gen_init.sh which is called from setup.sh
21:03
Bertl_oO
in gen_init.sh you can see a number of values controlling the width/height, display, sync and other parameters
21:04
Bertl_oO
most likely it only requires to play around with those to make it work on the viewer, but that can take some time and educated guesses
21:11
danieel
hdmi is not very much about guessing, the timings are well specified by CEA
21:11
Bertl_oO
well, yeah, but with many viewers that doesn't seem to help
21:12
Bertl_oO
but maybe our timings are wrong, please let us know if you do :)
21:12
danieel
i do make some fixed resolution stuff.. but that mostly requests the correct timing from the OS (preferred mode and no standard mode)
21:13
GrahamM
Iâm coming from a position of ignorance, so I wasnât sure how things were implemented.
21:13
danieel
only the RPi bootloader has trouble with that :)
21:17
Bertl_oO
in the near future, we will have the means to verify the signal we generate and thus correct any potential errors by comparing it to reference signals
21:18
Bertl_oO
but at the moment, it is basically adjusting things till it works
21:26
GrahamM
So there are enough tweaks within gen_init.sh, that I could potentially get a signal working with the BM VA4K?
21:26
Bertl_oO
I'm pretty sure
21:27
Bertl_oO
you can do all the adjustments at runtime, so no need to rerun everything
21:28
Bertl_oO
just issue the scn_reg commands on the shell and they will immediately take effect
21:28
danieel
the hw can do 3Gbps of data? (for 4k 422)
21:28
Bertl_oO
GrahamM: note that most display sinks take some time to adjust to changes, so it can take up to a few seconds till an image appears
21:29
Bertl_oO
danieel: the EDID would suggest so
21:29
danieel
I mean your transmitter side - the lvds pairs were for 1.6G no?
21:30
Bertl_oO
ah, then why don't you say so :)
21:30
Bertl_oO
no the current HDMI plugin modues top out at 1.5Gbit/s
21:30
Bertl_oO
*modules
21:30
danieel
so no 4k, 1080p60 top
21:31
Bertl_oO
the 4K HDMI module will be able to go beyond
21:31
danieel
one more thing.. the hdmi shall work without edid, so if you are not turning off the clock, changing the mode is hard to detect
21:31
danieel
and one another, the exact mode is communicated with a data island.. if you do not produce that, some receivers wont cooperate :)
21:32
danieel
basically same process as with nonbasic SDI modes
21:32
Bertl_oO
data islands can be generated with the current implementation, but they haven't been necessary for the devices we tested with yet
21:43
se6astian
off to bed
21:43
se6astian
good night
21:43
Bertl_oO
nn
21:43
se6astian
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ItsMeLenny
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davidak
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