#apertus IRC Channel Logs

good morning

how did the night go?

reading past discussions, I think it would be a good idea to start a workflow documentation

homemade raw vs dng, single frame per file vs stream, what is done in camera, what is done outside, what is the expected format, what is the less painful way for users, what covers the most used workflow (and what IS the most used workflow)

and also, are we talking about testing the workflow for the prototype or the finished camera, what are aiming at?

I have not had time to follow the workflow discuss tbh

*discussion

shall we start a goole doc or wiki page?

ok

https://docs.google.com/document/d/1ydH8KhJAbhChMuiSXfOjX8U6lD0tnyxaZa6p3SagWkw/edit?usp=sharing

we have lice HDMI output running !!!!

its rather live!

lice = live + nice :)

hohooo !

share something :-)

will snap a picture :)

the colors are unprocessed atm

Congratulations!

https://cloud.gerade.org/public.php?service=files&t=88644302ffde4f6e5659627a3c8bbf32&path=/Axiom/alpha/live-hdmi.jpg

you should create a small movie ;)

its so weird that I am the only person who can really see this now and there is no proper way to share it

yes!

can't wait :D

OK I think I am ready

off to bed now ... have a good one folks!

yes sleep well, you earned it ;)

you snapped some pictures, does google save them somewhere automatically?

I don't know where

agreed

thanks

I'll be able to start writing it up in just over an hour from now

I think we'd benefit very much from uploading a 10-15 second clip to Vimeo and then embedding it in the accompanying article

ok will twitter briefly about the news now

by the way, se6astian what hdmi recorder will you use?

se6astian: Very cool.

thanks

se6astian: Updated that shared doc

morning folks!

Morn Bertl

anyway, gotta start cooking dinner

Q2) Has a transform been generated for going from the camera profile to 709? (And likewise, has a 1D LUT been generated and applied via the board for the transfer curve?)

very shortly, there will be a 3x3+3 LUT before the HDMI out

the code is already there, it just needs to be integrated and tested

2) A 1D LUT for the transfer curve (which is approximately 1.95 straight gamma, but not entirely; there is a linear leg and a curve.

Bertl: Great. 1D LUT though right?

yes, the mathematics are simple for now, the 3x3 is not a 3D lut per se, it works more like a non linear matrix

the matrix is the matrix, I'd be more concerned with the curve.

the +3 are simply 3 12->12 1D luts

Why three?

because it is simpler

you can as well load them with identical values

Well that's positive.

like for example part of the color correction

Basically the 3x3 matrix will need to be distilled down (likely through pre-baked matrices)

(Bradford + raw primaries)

Sure.

then tack on the transfer via the 1D

Bertl: zero black level is achievable on sensor? (e.g. the adder allows signed operation?) or that is part of some calibration on CMV ?

RP?

rexbron_: Camera RGB to D65 via Bradford

rexbron_: It's a ridiculously cumbersome mess.

se6astian: The Adobe SDK

I see, before we used a modified libtiff to write dng files

Likely

I think it's a wank

It's just a lot of extra cruft that I can't see all that much usefulness out of

Bertl: Is that board fast enough to keep up or?

OTOH, the data rate is quite high with 4K/300FPS :)

Bertl: That's positive. I could see a bottleneck at that 300FPS zone.

Bertl: I could write a stub quickly, but that doesn't cut down on cost of storage during shoot.

Huffman I guess is ideal.

Bertl: Ping

it is giving me a three image picture.

what is rawfoobar.rgb?

I wonder how to do a linear encoding in JPEG2000.

i.e. use gray:rawfoobar.rgb

so if you want convert to create that either use this extension or again specify the format

convert -size 4096x3072 -depth 16 rawfoobar.rgb output.jp2

(Aside from the color mangling.

not sure how the encoder would know :)