| 00:40 | gcolburn | left the channel |
| 00:59 | gwelkind | joined the channel |
| 01:38 | FergusL | Hi gwelkind
|
| 01:38 | FergusL | I' have a few questions about using C in Python
|
| 01:44 | gwelkind | woah, alright, I am no expert, but shoot
|
| 01:44 | gwelkind | I'll do my darndest (and probably end up googling things)
|
| 01:48 | FergusL | gwelkind: didn't you say you did this ?
|
| 02:01 | gwelkind | Hmm, I think I was just praising it's ease of use and presence, but I know C++ alright and I have integrated them in the past
|
| 02:01 | gwelkind | what's your question, I'll help if I can!
|
| 02:01 | gwelkind | ^?
|
| 02:06 | FergusL | well just wondering if you were doing it with Pyrex or Cython or something else gwelkind ?
|
| 02:17 | gwelkind | Nah, start here: http://docs.python.org/3/extending/extending.html
|
| 02:18 | FergusL | ha !
|
| 02:18 | FergusL | thanks !
|
| 02:18 | gwelkind | np, dude, let me know how it goes :)
|
| 03:05 | gwelkind | left the channel |
| 03:11 | shinokubo | left the channel |
| 03:25 | gwelkind | joined the channel |
| 03:37 | gwelkind | left the channel |
| 04:04 | gwelkind | joined the channel |
| 06:46 | gwelkind | left the channel |
| 07:27 | gwelkind | joined the channel |
| 09:30 | Bertl | off to bed now ... have a good one everyone!
|
| 11:43 | shinokubo | joined the channel |
| 12:04 | shinokubo | left the channel |
| 12:08 | shinokubo | joined the channel |
| 12:37 | S3bastian | joined the channel |
| 12:41 | S3bastian | good afternoon
|
| 12:53 | FergusL | Hi here
|
| 12:53 | FergusL | or rather, morning everyone !
|
| 12:55 | S3bastian | did you switch to BUT ?
|
| 12:55 | S3bastian | ;P
|
| 13:00 | FergusL | no I'm on FUT, my own timezone
|
| 13:05 | S3bastian | I see :)
|
| 13:58 | shinokubo | left the channel |
| 14:18 | opusprod | joined the channel |
| 14:46 | opusprod | hello everyone
|
| 14:51 | FergusL | hi opusprod
|
| 15:20 | S3bastian | hey there!
|
| 15:33 | philippej | joined the channel |
| 15:52 | shinokubo | joined the channel |
| 15:55 | S3bastian | time to go home for me
|
| 15:55 | S3bastian | see you
|
| 15:55 | S3bastian | left the channel |
| 16:01 | shinokubo | left the channel |
| 16:09 | philippej | left the channel |
| 16:09 | shinokubo | joined the channel |
| 16:20 | Bertl | morning everyone!
|
| 16:35 | gwelkind | left the channel |
| 16:36 | philippej | joined the channel |
| 16:58 | se6astian | joined the channel |
| 16:58 | se6astian | back
|
| 17:00 | Bertl | wb
|
| 17:02 | philippej | very in teresting discussion on cml about testing red's sensor response to colour
|
| 17:03 | FergusL | what list is it on ?
|
| 17:03 | FergusL | or the thread name ?
|
| 17:04 | philippej | digital raw log
|
| 17:04 | philippej | thread name dear oh dear (dn't ask me why, it started with someone saying that all nominated movies were shot on arri)
|
| 17:04 | philippej | but it all boils down this (from Noel sterrett) : The R, G, and B filters each pass a range of wavelengths. The wider the range, the more difficult it
|
| 17:04 | philippej | is to nail down a particular color. The narrower the range, the more exact the color, but the less
|
| 17:04 | philippej | light available to the sensor. Accuracy vs. sensitivity.
|
| 17:04 | philippej | If the filters are so wide that each nearly overlaps the others, you have crosstalk that can't be
|
| 17:04 | philippej | fixed, i.e., monochrome.
|
| 17:06 | philippej | Earlier in the discussion, someone tested the red epic, and in red's case, it seems they choosed a colour array that have a quite wide range, so colour is harder to recover but sensibility is better
|
| 17:07 | Bertl | as all the pseudo technical articles/threads it should be taken with a lot^Hgrain of salt :)
|
| 17:09 | philippej | yes
|
| 17:09 | Bertl | JFYI, if you make the filter ranges really small, let's say red filter 620-660nm, green filter 520-560nm
|
| 17:10 | philippej | what is interesting is that no one knows what is done inside each camera, and it seems a lot of people believe that raw output = unprocessed
|
| 17:10 | se6astian | page 60 holds the spectral response curve of the CMV12000 datasheet in case anyone wants to see the overlap
|
| 17:10 | Bertl | then the sensor will see one yellow (the result of mixing red and green light) but not the other yellow (i.e. the range between 560 and 620nm)
|
| 17:11 | FergusL | se6astian: wasn't that page blank for a time ?
|
| 17:11 | se6astian | yes they added it in a recent revision of the datasheet
|
| 17:11 | FergusL | oh great !
|
| 17:11 | se6astian | let me update github
|
| 17:11 | FergusL | Troy was interested in seeing it
|
| 17:11 | Bertl | bottomline, if you want to avoid blind color spots, you have to have overlaping filters
|
| 17:12 | Bertl | and they have to overlap in a way which somewhat matches the color hue, otherwise it will go from red to green without passing yellow
|
| 17:13 | se6astian | done
|
| 17:13 | se6astian | https://github.com/apertus-open-source-cinema/alpha-hardware/tree/master/Datasheets
|
| 17:13 | Bertl | maybe add the ANs as well, and I think I have a bunch of other documents which might we worth adding
|
| 17:13 | se6astian | I will need to ask for permission to publish them first
|
| 17:14 | Bertl | (but double check with cmosis, not that they have a problem)
|
| 17:14 | philippej | yes, but as a guy tested it, he said that in case of red camera, the overlap was so huge that it would have poor dr on some colors.
|
| 17:14 | se6astian | firstly I would like to understand what "dynamic range of colors" means exactly?
|
| 17:15 | se6astian | latest facebook stats: Weekly Total Reach: 30,622 +2,262.8%
|
| 17:16 | Bertl | se6astian: out of context it sounds like a PR term :)
|
| 17:18 | philippej | the guy poster this: http://achtel.com/Downloads/Canon%2050D%20vs%20RED%20Epic.jpg
|
| 17:18 | philippej | (posted)
|
| 17:18 | gwelkind | joined the channel |
| 17:19 | se6astian | I am subscribed to the list as well and read a mail from time to time but was wondering if they really know what they are talking about...
|
| 17:19 | Bertl | considering that they post color squares in jpeg, I'd say they know little about anything :)
|
| 17:20 | philippej | well, unfortunately the whole thread is not online afaik, but it is interesting
|
| 17:21 | se6astian | maybe they do know a lot but are not able to articulate their thoughts in a way that is clearly comprehensible to others, it can happen, I have seen a lot of brilliant scientists who are just not able to communicate their ideas properly
|
| 17:28 | FergusL | there are a lot of people on this huge list, primarly made for DOPs, some do know what they are talking about, you can easily notice them, they pop in the right threads generallu
|
| 17:35 | se6astian | re-reading part of this discussion now it gets a bit more clear for me
|
| 17:35 | se6astian | obviously I also was part of the problem as I just didnt pay enough attention
|
| 17:36 | gwelkind | left the channel |
| 17:36 | se6astian | there seems to be the idea that the RED MX sensor could be using a different color filter array than the classic bayer pattern
|
| 17:36 | se6astian | like CYYM filter or another variant: https://en.wikipedia.org/wiki/Color_filter_array
|
| 17:37 | se6astian | "CYGM gives more accurate luminance information than the Bayer filter, hence a wider dynamic range, but at the expense of color accuracy. "
|
| 17:39 | se6astian | each color filter allows only a specific band of wavelengths to pass, if you make that band wider you obviously let more photons pass and thus are more sensitive to the same amount of light
|
| 17:39 | se6astian | though you can not as accurately say of which wavelength the photon originally was (using the reading from a 2x2 photosite block)
|
| 17:40 | Bertl | first, that really depends on the light
|
| 17:40 | philippej | I just wanted to point those discussions among people who (at least some) look like they know what they are doing, and it's fascinating to see how much reverse engineering is being done to understand what the hell is doing a particular camera. So, an interesting use case for us being opensource.
|
| 17:41 | Bertl | if your red filter is centered around 680nm, and your light source is 680nm, then it won't matter if you make the filter band wider or smaller
|
| 17:45 | FergusL | agreed philippej, I like how CML is a melting pot of all this
|
| 17:45 | FergusL | and there are some very solid threads particularly about VFX, grip and lighting stuff
|
| 17:54 | gwelkind | joined the channel |
| 17:57 | opusprod | I sebastian , will you give me please the renders you 've done
|
| 18:01 | se6astian | sure
|
| 18:02 | guesst | philippej: 400nm is nearly UV :)
|
| 18:05 | guesst | comparing the cmv- to kac-, the cmv would be more like red (violet instead of blue on 400nm)
|
| 18:10 | philippej | left the channel |
| 18:25 | philippej | joined the channel |
| 18:44 | gwelkind | left the channel |
| 19:20 | philippej | left the channel |
| 19:24 | gwelkind | joined the channel |
| 19:33 | shinokubo | left the channel |
| 19:44 | gwelkind | left the channel |
| 20:01 | gwelkind | joined the channel |
| 20:13 | philippej | joined the channel |
| 20:13 | philippej | left the channel |
| 20:14 | philippej | joined the channel |
| 20:15 | philippej | left the channel |
| 20:36 | opusprod | left the channel |
| 20:55 | philippej | joined the channel |
| 21:01 | gwelkind | left the channel |
| 21:03 | philippej | left the channel |
| 21:37 | gwelkind | joined the channel |
| 21:57 | gwelkind | left the channel |
| 22:17 | mikkael | joined the channel |
| 22:19 | shinokubo | joined the channel |
| 22:22 | se6astian | time for bed
|
| 22:22 | se6astian | good night
|
| 22:23 | se6astian | left the channel |
| 22:27 | carsonau | joined the channel |
| 22:28 | carsonau | left the channel |
| 23:07 | shinokubo | left the channel |
| 23:09 | mikkael | left the channel |