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#apertus IRC Channel Logs

2015/12/15

Timezone: UTC


23:01
danieeeel
joined the channel
23:22
troy_s
alexML: Ugh.
23:22
troy_s
alexML: I will step you through a more proper toolset if you are interested. I am around tomorrow.
23:40
troy_s
alexML: Probably take ten minutes to give you the lowdown.
00:47
pozitron
joined the channel
01:39
arpu
left the channel
01:39
arpu
joined the channel
03:27
troy_s
God. SCREW DNG
03:27
troy_s
SERIOUSLY
03:27
troy_s
What a bunch of rubbish.
04:24
Bertl_zZ
changed nick to: Bertl
04:24
Bertl
morning folks!
04:44
jucar
joined the channel
05:01
Bertl
off for now ... bbl
05:01
Bertl
changed nick to: Bertl_oO
05:34
troy_s
Bertl_oO: Here's the updated matrix for D50 adapted based off of the Hutch chart
05:34
troy_s
Bertl_oO: Image: http://www.pasteall.org/pic/show.php?id=96530
05:35
troy_s
Bertl_oO: OCIO stanza http://www.pasteall.org/62722
05:36
troy_s
(The first matrix takes the camera raw to XYZ based on a D50 chromatic adaptation, the second stanza takes the data from XYZ D50 to sRGB D65)
05:37
troy_s
To view, use the Hutch colorchart raw12 data from irieger's shot, debayer it, and stuff it into a tif or like format. Load an OCIO enabled application with the above stanza included and simply flip the image to the colourspace.
05:37
troy_s
(Description in the stanza is old, so ignore it.)
05:43
troy_s
irieger: Did you pop any further sample footage.
05:59
troy_s
Here's the IT8 irieger shot using the HutchColor generated D65 result: http://www.pasteall.org/pic/show.php?id=96532
05:59
troy_s
(That is, it is using the matrix I derived from the HutchColor chart, not using a custom matrix based off of the IT8 in question.)
05:59
troy_s
And here's the ColorChecker Passport shot under the same HCT generated matrix, again, D65 adapted:
06:00
troy_s
http://www.pasteall.org/pic/show.php?id=96533
06:00
troy_s
Ok. Off for bed.
06:01
troy_s
At some point it would be great if Bertl_oO and irieger would be willing to learn OCIO so that we can all standardize on the OIIO image viewer and all see the same things using the proper transforms. I'm happy to push and maintain an OCIO configuration with LUTs but I need you folks on the same page.
06:01
troy_s
se6astian|away you too.
06:01
troy_s
(and anyone else interested, ping me.)
06:02
troy_s
irieger: Nice work on the tweaked registers. The results are pretty damn impressive for being this early.
06:08
troy_s
15ms version of the Passport http://www.pasteall.org/pic/show.php?id=96534
06:08
troy_s
(the original was the 40ms
06:08
troy_s
30ms version of the Passport http://www.pasteall.org/pic/show.php?id=96535
06:09
troy_s
50ms version of the Passport http://www.pasteall.org/pic/show.php?id=96536
06:09
troy_s
Those are _all_ using the identical OCIO transform as given in the above stanza, all based off of the HCT with synthetic black and white D50 points added to the reference data in irieger 's directory.
06:10
troy_s
I also had to reformat the blasted HCT data using vi which was a bit of a pain, so perhaps irieger or Bertl_oO could upload it to the directory:
06:11
troy_s
http://www.pasteall.org/62723
06:11
troy_s
That's with the synthetic D50 black and white appended.
06:13
troy_s
Got to say, the charts look darn good.
06:13
troy_s
So much better than the Alpha data.
06:13
troy_s
Anyways, out. Ping me and make sure you use my handle.
07:57
intracube
troy_s: looks good
07:57
intracube
troy_s: looks like there's a slight green/blue cast to the shadows
07:58
tezburma
joined the channel
09:56
pozitron
left the channel
10:17
tezburma
left the channel
10:30
tezburma
joined the channel
11:26
John_K
hello all
11:27
John_K
Bertl_oO: do you remember what values you use fro the bypass caps on the dummy interface board?
11:27
John_K
for*
11:27
John_K
the 0805's
12:05
John_K
btw, there are major problems with the Sensor board v0.18 R1.3 BOM, a huge amount of parts are specified as 0402 when they are using 01005 foorprints
12:07
John_K
hrm, or its just really late and I'm missing something
12:09
John_K
gah board revisions are different, my pcb is r1.3 and the bom is r1.4 - look likes some components grew in the revision bump
12:10
John_K
time for bed
12:25
irieger
troy_s: I'm still sitting here trying to tweak sensor DR mostly. Getting around 6-7 stops currently which I don't see as enought and as everything else in the color science depends I'm currently focused on the DR
12:26
irieger
troy_s: I in general have no Problem with OCIO. Could throw it in Nuke/Fusion. Or just read the matrix from it to use my matlab code ;-)
13:32
troy_s
irieger: The PL should augment the DR
13:34
troy_s
intracube: Didn't see it. Nor did I look too closely.
13:34
troy_s
irieger: OCIO / OIIO as the baseline reference tools, not Nuke / Fusion.
13:35
troy_s
OIIO has iv the image viewer.
13:35
troy_s
Which when cyclically compiled has OCIO support.
13:35
troy_s
At least to baseline all of the working tools.
13:46
irieger
ok, didn't knew there was an image viewer in the package.
13:46
irieger
troy_s: PL?
13:47
troy_s
irieger: Piecewise Linear ramps
13:48
troy_s
irieger: Hopefully the PL ramps can deliver roughly equal bits per stop.
13:48
troy_s
(It isn't a curve, but perhaps some bending by the onboard chips with the PL ramp will get the DR up to where it needs to be.)
13:49
troy_s
(And keep the bits per stop equal.)
13:49
irieger
Ah, sure.
13:53
intracube
troy_s: no problem. I'm sure this is the first profile iteration of many :)
13:53
intracube
just for ref: http://imgur.com/UthfWAx
13:54
intracube
quite noticeable in context with Blender's (and imgur's) grey interface
14:00
troy_s
intracube: Notice how it scales to white.
14:00
troy_s
intracube: I will speculate and say that the illumination wasn't D50
14:00
troy_s
irieger: What did you light those charts with?
14:01
troy_s
intracube: What does the sample line yield on the Hutch?
14:02
irieger
troy_s: Have I already uploaded an image? Not sure.
14:02
troy_s
(I am reasonably sure the D50 XYZ to D65 matrix is accurate, but it was canned and I didn't do the math to derive it)
14:02
troy_s
irieger: The December 10th images? Are they yours?
14:02
troy_s
I was under the impression they were your set.
14:03
irieger
I'm not sure if/what I shared the last days. But I think you mean some images from se6astian|away or so. Can't say what they did. I'm many hundred kilometers away from the headquarters ;-)
14:03
troy_s
Hrm. Let me grab the link.
14:04
troy_s
http://files.apertus.org/AXIOM-Beta/snapshots/colorcharts/
14:04
intracube
troy_s: highlights are also lacking in blue slightly by the look of it
14:04
troy_s
(That HCT CIE file was yikes... No line breaks.)
14:05
irieger
Nope, not mine ...
14:05
troy_s
intracube: Sounds suspiciously like a skew along the magentaish / greenish axis, which stinks of good for nothing Kino Flo's.
14:05
troy_s
;)
14:05
troy_s
Could be a matrix boo boo, but my gut says illumination tool.
14:06
intracube
doesn't know pro-lighting :)
14:06
troy_s
Kino Flo are fluorescent tube fixtures.
14:06
troy_s
Widely known for their colorimetric poopyness.
14:07
troy_s
(Used regularly, but often requiring correction if accidentally hitting a face.)
14:07
irieger
troy_s: I'm doing everything with two 750W tungstens with a full CTB to have a roughly 5000K temp with a continous spectrum
14:07
troy_s
Not a great tool for profiling.
14:07
troy_s
Bingo.
14:07
troy_s
irieger: How much CTB?
14:07
irieger
troy_s: Nicely described.
14:07
intracube
troy_s: ah, ok
14:08
troy_s
irieger: I would think an HMI source would be less gel to reel down?
14:08
troy_s
Full CTB is a thick slab of gel.
14:08
irieger
troy_s: a full one per light. Gives me roundabout 5000K which is the area where most sensors are kind of at home.
14:08
troy_s
(Puts more reliance on Rosco and Lee.)
14:08
irieger
troy_s: I know. But its a much more nicely spread spectra
14:08
troy_s
irieger: More importantly the spectro results are all D50
14:09
troy_s
HMI should be pretty smooth too, reflectors depending.
14:09
irieger
as I already said I didn't so much color
14:09
troy_s
So six to seven stops in linear mode eh?
14:09
troy_s
Do you have NDs at your institute?
14:10
troy_s
(Gel)
14:10
irieger
Yep, HMI is pretty good too. Better than I thought actually after looking at the spectra now. Problem was: All the usable HMIs where on a shoot when I set up my lab last week
14:11
irieger
troy_s: currently yes, about 7 stops. And we have all kinds of correction, ND, WD etc.
14:12
troy_s
i1 Display Pro is on sale for 100$ off if anyone is interested. BHPhoto.
14:12
troy_s
Skookum good deal.
14:12
irieger
Have one already ;-)
14:12
troy_s
irieger: Have you ever set up a latitude test in camera?
14:13
troy_s
If you have ND or nets you can probably set one up rather easily.
14:14
troy_s
(Single frame, all stops represented in full stop or finer increments.)
14:16
troy_s
irieger: You are likely more than capable to start experimenting with that PL voltage
14:45
irieger
troy_s: Only worked with exposure adjustment but I have planned to shoot another test with some over/under via nets/additional lights or so. Even if not ideal the exposure shifting worked quite good with the blackmagic thought.
14:46
irieger
As said, I had to work with what was available. The other production just came back so in the coming days I should have access to more equipment. And I prefer nets over ND gels
15:01
troy_s
irieger: Look forward to your tests
15:03
irieger
me too ;-)
15:07
troy_s
irieger: Are you working on your PhD?
15:17
irieger
troy_s: Bachelor thesis ...
15:17
irieger
PhD is far away I'd say ;-)
15:17
irieger
don't know if I will go that route
15:18
irieger
The working title I now working under is 'Designing a color pipeline for the Apertus Axiom open source camera.'
15:19
troy_s
Lulz.
15:19
troy_s
That including dailies?
15:19
troy_s
The mighty fork between editorial and post.
15:20
irieger
well, shouldn't matter where it is used later on ;-)
15:20
troy_s
???
15:21
troy_s
You said pipe, that would be included.
15:21
irieger
it's up to the users to use the tools, isn't it ;-)
15:21
troy_s
Otherwise it is more of a mesh grating.
15:21
troy_s
Oh god no.
15:21
troy_s
You sort of need to frame the pipe.
15:22
irieger
Sure. Let's see how it develops. In general I'm aiming to do the whole picture but it depends how it is going.
18:58
tezburma
left the channel
19:55
Bertl_oO
John_K: should be 47u, but 22u might be more than enough
21:21
Bertl_oO
off to bed now ... have a good one everyone!
21:21
Bertl_oO
changed nick to: Bertl_zZ
22:05
irieger
changed nick to: irieger|away