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28th November 2007, 16:08 | #1 | Link |
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Is xvYCC color space supported in avisynth?
Just bought a new Sony HD handy cam and it has the option of recording in this new extended color space - my TV does not support HDMI 1.3 so it does not play on that, wondering if avisynth can process footage shot in that color space.
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28th November 2007, 18:15 | #2 | Link |
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First of all, if you don't change colorformats, anything colorspace you put in comes out the same.
In principle there is nothing holding AviSynth back for supporting conversion to/from it, but I cannot find any conversion matrices for it online.
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28th November 2007, 22:55 | #3 | Link | |
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Quote:
Avisynth is currently 8 Bit, any conversion will downgrade the image to the current quality of 24bit RGB limits. However I have added some infrastructure to the API in 2.6 to be able to define 16bit and 32bit per channel formats. So some time in the future there can be actual code that implements these extended formats. |
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29th November 2007, 00:58 | #4 | Link |
interlace this!
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is this just YUV with 0-255 ranges? in this case avisynth should support it already.
wikipedia is a bit light on the details about this, apart from the marketese sounding "deeper colours".
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29th November 2007, 06:13 | #5 | Link | |
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Quote:
xvYCC uses the full range of values (1 to 254 in an 8-bit space) to represent colors. In BT.601 and BT.709, RGB colors are represented only by 8-bit values from 16 to 235. This limited range was established to allow for undershoot and overshoot, attributes of analog TV signaling. With digital TV signaling, there is no undershoot or overshoot, and the values from 1-15 and 235-254 can be used to represent real colors. In order to maintain backward-compatibility with earlier standards, the red (R), green (G), blue (B) and white standard colors are still calculated at the same indices in the color space. The wider ranges of digital values allow representation of deeper greens, deeper reds, and deeper blues - and of course intermediate colors previously beyond the boundary limit in the CCIR 601 color space.Full article here http://www.answers.com/topic/xvycc |
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1st December 2007, 09:47 | #6 | Link |
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This is BT.709 Gamut (pretty close to 601 and NTSC) with the fullrange exposed. The primary reason 16-235 was chosen for digitization was because of the expectation that wider gamuts would shortly come into use; turns out they were about 20 years too early.
You can process it all you want in Avisynth, as long as it can read the container format, just don't convert it into 8-bit RGB or you'll lose all the extended range. You need a tool to convert it to 16-bit or higher RGB to be useful. Despite what wiki sez, most cheap LCDs have a gamut limited to sRGB or at most approaching NTSC, though, so don't expect it to automatically translate to vibrance unless you have something like a new Bravia or another LED backlit set. |
2nd December 2007, 13:15 | #7 | Link |
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doc is not free.
http://webstore.iec.ch/webstore/webs.../artnum/035442 Preview: http://webstore.iec.ch/preview/info_...4{ed1.0}en.pdf Correction 1: http://www.iec.ch/cgi-bin/getcorr.pl...1{ed1.0}en.pdf HDMI 1.3 http://www.eetchina.com/ARTICLES/200...URCES=DOWNLOAD See slide 17 of this: http://www.jeita.or.jp/japanese/hot/2006/0830/0830.pdf Seems, luma is not extended. Last edited by Fizick; 4th December 2007 at 16:29. |
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