#apertus IRC Channel Logs

good day

hi vup, great, any news to report?

nice!

I have been working on improving the recorder a bit

I found sz3 to offer the best compression ration (while keeping the error bound constant)

Furthermore, I worked a bit on the recorder.

where nodes that performe single processing steps (like debayering, bitdepth conversion, displaying, reading a input file, etc) can be connected into a (directed) graph to create full processing chains (graphs)

However the recorder could not make full usage of that architecture, because the cli interface only allowed to describe a single chain of processing nodes, meaning it was impossible to connect say a display node and a node that save output to the disk to the same input node

For example: https://github.com/apertus-open-source-cinema/axiom-recorder/blob/b85e8a578b2da9d9997bd9a3f72eea8d36a1c945/darkframe.yml

furthermore I improved the average node to be able to calculate the per pixel variance aswell

as for a screenshot, its hard to show whats done in a screenshot, but this shows 4 display nodes displaying the same input: https://f.coroot.de/2022-05-16%2016-48-05.mkv

I think this is basically it. Next up is integrating the sz3 compression and then actually capturing darkframes

compensation

the main hurdle there would be a input format that actually carries the necessary metadata

could these parameters be set manually for now?

uploaded above video to youtube for easier viewing: https://www.youtube.com/watch?v=phoot1YmpqM

I think the easiest option would be to support affine transformations in the lut3d node

se6astian: do you know if you can create 3d luts that do affine transformations and not just linear?

"typical 3d lut" creation programs that I am aware of create creative color transformations

please elaborate on affine vs linear?

affine means that you can also shift the value

but any LUT can do that no?

I am stupid

<vup> I am stupid <- I highly doubt that but glad I could help :D

excellent!

you mean, one that just calculates the sum of the image?

thats easy enough

I don't really know what a visually satisfying value for the resulting sum is though

well its composable

hmm how do you define the percentage?

and for that a console output is fine I guess

with raw2dng tool it looked like this:

Average : 127.36 # about 128, OK <br />

Row noise : 2.30 (42.2%) # this one should be only dynamic row noise - see Method 3 below. <br />

hmm, I can look at how these values are calculated

currently its text only

perfect

what are your planned next steps?

after that, maybe adding some simple darkframes compensation / analysis nodes

very nice progress!

Bertl already texted me he is occupied at the meeting today but also has nothing new to report

PCBs have arrived so thats good

right, anyone else?

many thanks vup!