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#apertus IRC Channel Logs

2014/11/26

Timezone: UTC


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fsteinel_
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Bertl
off to bed now ... have a good one everyone!
03:31
Bertl
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se6astian|away
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09:26
se6astian
good morning
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se6astian
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Bertl_zZ
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11:01
Bertl
morning folks!
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16:15
intracube
afternoon all
16:20
se6astian
hi there
16:22
intracube
hey se6astian
16:27
intracube
has been reading about the TAG CDMX trip
16:27
intracube
se6astian: do you know if there is any video online of the presentations (in english?)
16:38
se6astian
not that I know of
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16:41
Bertl
intracube: they have been recording but I think they do not plan to have everything online
16:42
Bertl
but I will upload a compacted version of my slides soon, so the information should be there
16:42
intracube
se6astian: Bertl: okies
16:42
intracube
Bertl: nice, I look forward to that
16:43
Bertl
it is mostly a historical timeline from my personal perspective
16:45
intracube
I'm curious about what limits for the FPGA processing will be.
16:45
intracube
some of this info is already on apertus.org
16:46
intracube
I guess the details won't be known until the code is written and the processing is benchmarked?
16:46
Bertl
you can get a good estimate with the xilinx tools
16:47
Bertl
i.e. if you have some specific code, you can see how many resources, power, etc it will consume
16:57
intracube
Bertl: will it be possible to apply different LUTS to the 3 HDMI outputs?
16:58
Bertl
depends on the LUT and how complex it is
16:58
Bertl
a simple separate linear LUT doesn't cost much, i.e. that is no problem x3
16:59
Bertl
a complex 3D deep color LUT costs very much, I doubt that will be doable for 3 outputs
17:13
intracube
Bertl: by simple do you mean a 1D LUT for each of the RGB channels?
17:13
intracube
then x 3 for each HDMI?
17:14
intracube
ie, the type of LUT that can be loaded onto a typical computer video card
17:15
Bertl
yes, for example
17:15
intracube
ah, that's good
17:15
Bertl
it basically requires a memory resource per channel
17:16
intracube
Bertl: not sure if you saw this: https://wiki.apertus.org/index.php?title=User:Intracube#CMOSIS_CMV12000_registers
17:16
intracube
data parsed from cmosis pdf
17:17
Bertl
ah, nice
17:17
intracube
..*hopefully* all the data is correct. I had to do a bit of manual editing too ;)
17:18
intracube
I've got a reasonable work-flow so if there's any data in other pdfs, it can be converted fairly quickly
17:21
Bertl
good to know
17:42
Bertl
off for a nap ... bbl
17:43
Bertl
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18:36
troy_s
intracube: Aka transfer curve LUT per vhannel
18:36
troy_s
Channel even
18:37
troy_s
intracube: A rather fascination email from Mr. Fairchild the other day that you may be interested in...
18:38
troy_s
intracube: Did you know that scene referred imaging can result in escaping the original chromaticities of the primary lights?
19:24
intracube
troy_s: ?
19:25
intracube
do you mean like biofluorescent surfaces like flowers?
19:38
davidak1
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20:06
troy_s
intracube: No. Indirect lighting does it.
20:07
troy_s
intracube: Basically RGB is pre-baked spectral. Indirect lighting (two RGB images for example, multiplied) pushes the luminance and chromaticities outwards.
20:08
danieel
i think it just can redistribute the non-narrow band of primaries, to make the average/peak somewhere else
20:08
troy_s
It is the basics of physics. Happens in the physical world as well.
20:08
danieel
you cant change the wavelengt without fluorescence... can you?
20:08
troy_s
The main issue is that folks have a very legacy view of imaging (IE display referred)
20:09
troy_s
Indirect lighting does this. It is a multiplication.
20:09
troy_s
So for example, if you have an sRGB set of primaries, and you use a scene referred model, the results of multiplication will expand in luminance and, as a result, chromaticity.
20:10
troy_s
Basically it has to do with greater than one source, which for all intents and purposes is two RGB images, two sources, or whatever.
20:10
danieel
the multiplication happens where?
20:11
troy_s
Indirect lighting does it. Or an image operation that simulates it via multiplication of two regions via nodes or layers.
20:11
danieel
well, if you shine red light on orange surface, it will get red... that is what you talk about?
20:12
troy_s
(A red petal illuminated by a red light for example, or a red petal illuminated by an adjacent petal lit up.)
20:12
troy_s
Sort of. It goes deeper than that.
20:13
troy_s
It reveals a rather horrific misunderstanding of models (IE display referred versus scene referred) and legacy ideas of imaging (that your imaging is agnostic or unrelated to your primaries)
21:08
Bertl_zZ
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21:08
Bertl
back now ...
21:09
Bertl
actually it depends on the orange surface, it is possible that it just absorbs the red light and stays exactly the same :)
21:53
intracube
troy_s: sorry, I don't get it
22:15
intracube
bed time
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intracube
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22:19
se6astian
me too
22:19
se6astian
of to bed
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se6astian
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