Author Topic: Chroma Smoothing  (Read 12783 times)

arturochu

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Chroma Smoothing
« on: April 02, 2014, 07:56:37 AM »
can someone explain to me what chroma smoothing option does in raw video postprocessing? whats the diference between none, 2x2, 3x3, etc... does it have the same effect for all the cameras, what's the recommended setting for the 5d mark iii shots?

sorry but i coudn't find any post regarding this concerns, i think the search function in this forum kind of sucks.


cheers.
Chu

kaco

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Re: Chroma Smoothing
« Reply #1 on: April 17, 2014, 03:35:16 PM »
can someone explain to me what chroma smoothing option does in raw video postprocessing? whats the diference between none, 2x2, 3x3, etc... does it have the same effect for all the cameras, what's the recommended setting for the 5d mark iii shots?

sorry but i coudn't find any post regarding this concerns, i think the search function in this forum kind of sucks.


cheers.

I was also searching for this. Look here: http://www.gna-productions.com/tutos/how-to-process-magic-lantern-raw-videos Part 2: 2) REMOVE PINK DOTS USING PINKDOTREMOVER

fascina

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Re: Chroma Smoothing
« Reply #2 on: May 25, 2014, 06:39:59 PM »
With the "Magic Lantern RAW Video converter" tool, I have to decide if I want to convert my MLV files with chroma smoothing or not: None, 2x2, 3x3, 5x5.

I'm using the Canon 5d Mark III. What chroma smoothing choice shall I choose, "None"?

Audionut

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Re: Chroma Smoothing
« Reply #3 on: May 26, 2014, 05:52:44 AM »
Chroma smoothing, as the name implies, smooths the details in the chroma data.

The different options simply set the size of the area, where the chroma is smoothed together.  Imagine you have your entire 1080p source frame, and in this frame, sections of 2x2 (or 3x3, 5,5 etc), are smoothed together.

Smoothing larger sections (vs smaller sections), will smooth more detail.

http://en.wikipedia.org/wiki/Chrominance

Our eyes are less sensitive to detail in the chroma channel, so this is a very useful way of dealing with noise/artifacting without a large impact on perceived detail.

arturochu

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Re: Chroma Smoothing
« Reply #4 on: May 26, 2014, 06:46:36 AM »
got it perfectly, thx
Chu

fascina

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Re: Chroma Smoothing
« Reply #5 on: May 26, 2014, 11:51:19 AM »
Hello Audionut, thank you for your detailed answer.

I have now made several conversion tests with my 5D Mark III footage, with chroms smoothing set to "none", 2x2, and 5x5.

Resulting that the image quality is by far the best when using no chroma smoothing. With chroma smoothing activated, diagonal lines are jagged.

So for my 5D MIII footage, I will definitely not use chroma smoothing.

a1ex

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Re: Chroma Smoothing
« Reply #6 on: May 26, 2014, 11:53:04 AM »
With chroma smoothing activated, diagonal lines are jagged.

Do you have an example? (a DNG extracted without chroma smoothing, and JPEG crops showing the difference, should be enough).

fascina

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Re: Chroma Smoothing
« Reply #7 on: May 26, 2014, 05:03:34 PM »
Hi a1ex,

yes, here are the samples with 5D mark III footage:

Chroma Smoothing Comparison:



Raw File (processed without chroma smoothing):

http://www.webpage-design.org/010.dng


MLVs processed with MLV_dump and MLV Converter 1.9.2.

JPGs processed and sharpened with Adobe Camera Raw.

123kid

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Re: Chroma Smoothing
« Reply #8 on: December 10, 2014, 03:48:09 PM »
i have some requests hier so here is my raw video...there are many white dots on the right...on the left video chroma smoothing is turned of...but i see other artefacts on it..like teal and pink dots...also vertical lines on the left side...anybody know how to fix this? i recorded it with canon 6d ml



https://www.dropbox.com/s/2kxj4cfg1l0slla/vlcsnap-2014-12-10-15h40m47s50.png?dl=0