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Topics - chmee

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General Development Discussion / a small chat about demosaicing
« on: October 13, 2014, 12:44:22 AM »
hey. so, i'm about to implement something like demosaiced output and now trying to decide, what algorithm is good/better. what are the "best" algorithms today? its not only about canon-ml, but as well for the future implementation for apertus-mlv-data. lets do a smalltalk about it.

thanks and regards chmee

2
Raw Video Postprocessing / ML Samplefiles
« on: May 17, 2014, 01:34:38 AM »
i discovered, i cant deliver good code, if i dont have any examples from other bodies than mine. so i ask here for more samplefiles. these are the rules for good footage:

* resolution is not important, but should be higher than 1280px width.
* very important: high dynamics with overexposures and black/dark areas.
* something (blackwhite) with details/pattern
* colors, maybe you've got a colorchecker or you print out any testpattern. (examples 01, 02, 03)
* infos, you should deliver: body, original firmwareversion, ml-build, hack On/off, Blacklevelfix On/off, Cropmode Yes/No?
* mlv or raw file should be maximum ~80mb, i/we just need some frames (5-15)
* audio is good, but not necessary

* if you dont know, where to host your files, send it to me (raw2cdng@phreekz.de), i'll put them into the same path as the others

regards chmee

3
the question is mainly in the subject. Are we able to read out the colortemperature or the XY-formed Data? I've seen there is some "reserved" room for some more data..

regards chmee

4
Magic Lantern Forum and Site Discussion / notification issue
« on: June 14, 2013, 12:46:45 PM »
since i am registered i dont get any notifications, neither in profile nor as email.
buttons for notifications in actions are marked
so i used to get a notification as i start to participate any thread - not in this forum :)
not even the notification-button in the thread is there :) or i am blind.
(kind of difficult to follow all replies in the threads i write)

regards chmee

5
Raw Video Postprocessing / The CinemaDNG Discussion (raw2cdng)
« on: May 23, 2013, 10:46:55 AM »
Hey there.. I'm currently trying to realise a CinemaDNG-Converter. First i thought it would just be an existing xmp-packet inside the dng-frame, but it wasn't. After reading the CinemaDNG-Definition i saw, there are about 35 mandatory tags.

DNG Specification 1.4.0.0 - June 2012 - CinemaDNG Specification 1.1.0.0 - September 2011

The CinemaDNG-File is just a TIFF/PE File (as DNG is also) with these CDNG-Tags. I wrote an App for Win7, building a CDNG-Header with the raw-pictures from the Camera-raw-file. They are 14Bit, isnt it? I figured out, that Resolve and Speedgrade cant handle 14Bit Raw-Frames! Just 8, 10 or 16Bit, maybe 12Bit. So, now i'm sitting on converting these 14bit to 16Bit-Chunks. These CinemaDNG-Sequences are recognised by Resolve and Speedgrade, but they are chaotic because of wrong handling/converting.

If asking, why the simple DNG-Sequences are not usable, it might be that
(+) missing CDNG-Tags
(+) IFD0-Entry is the jpg-Preview in 128x96px 8Bit - thats the one you see in Resolve.
(+) Raw-Data are packed into a subIFD - as in the DNG-Definition described.
(+) they are 14bit.
 
Questions:
(*1) Raw-Data - Subpixel-Chunks, MSB or LSB first? LittleEndian, so LSB first, right?
(*2) is it worth that? Maybe another Fileformat would be more usable? DPX? EXR? TIF?

regards chmee


regarding raw2cdng

i decided to stay on the same name and same tool with integrated mlv-convert (since 1.4.5). Resolve, Speedgrade and all ACR-using-Apps are coping well with the cdng's. With 1.5.0 (coming next) there s a new GUI, and on NAB(07.04.2014) Adobe releases a bigger update promising a better workflow with cdng. 1.5.0 is online. since 1.6.5 audiosync seems stable, colormatrices are refreshed. you find more info on my webblog.

please look in my blog-entry to find the newest version!

bitbucket-sourcecode c# (with 1.5.0beta2 i've left it into the free world)
https://bitbucket.org/chmee/raw2cdng

actual release : raw2cdng 1.6.5 for windows
http://www.magiclantern.fm/forum/index.php?topic=5618.msg136306#msg136306

regards chmee

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