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Gamut error rejection
Hi,
I got tape rejected for “RGB composite gamut” error. I have gone trough some forums and done some research but still some things are unclear for me. After got rejected I arranged for one scope with gamut indicator.
1. I have already applied broadcast safe trough out my program to 95%, even to text, flashes etc.
2. It’s not showing peaking anywhere above 100IRE.
3. I got lots of flashes effect (dither dissolve) and fire footage in my program where I am getting this gamut error. It’s all showing fine in waveform and I can not lower it any further as it will look bad creativelyDose this gamut error means there is some part exceeding 100IRE even after applying broadcast safe, but it not visible in normal FCP waveform?
How can I make entire frame dull for this gamut? Or is there is there any another way, or I am missing something.
Regards
nitin -
9 Replies
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[nitin kulkarni] “I got tape rejected for “RGB composite gamut” error.”
gamut : The most common usage refers to the subset of colors which can be accurately represented in a given circumstance, such as within a given color space or by a certain output device.
your COLORS were not within the bounds of NTSC or PAL colorspace (depends on where you are)
gary adcock
Studio37
HD & Film Consultation
Post and Production WorkflowsInside look at the IoHD
https://library.creativecow.net/articles/adcock_gary/AJAIOHD.php -
Broadcast safe does nothing for your colors. Look at your Vectorscope. You have a problem in there with colors.
Walter Biscardi, Jr.
Biscardi Creative Media
HD and SD Production for Broadcast and Independent Productions.STOP STARING AND START GRADING WITH APPLE COLOR Apple Color Training DVD available now!
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You can try using the RGB Limit filter in the color correction folder. There is good documentation in the manual about what it does.
-Russ
Russell Lasson
Universal Post
Ridgeline Digital Cinema Mastering
Salt Lake City, UT -
I think that having your video levels legal, your movie have RGB out of the specs.
If you are using the Broadcast Safe filter, check the last button: RGB Limiting.
This should eliminate the out of gamut values.
Rafael -
[Rafael Amador] ” RGB out of the specs. “
If you are trying to deliver RGB to a network you should be shot
Video is broadcast as YUV.
gary adcock
Studio37
HD & Film Consultation
Post and Production WorkflowsInside look at the IoHD
https://library.creativecow.net/articles/adcock_gary/AJAIOHD.php -
Yes. This have nothing to do with delivery RGB to a network.
You can have your Luminance and Chroma levels perfect while having R, G or B values over 100% or below 0%.
Those values are not legal and will be clipped.
The YUV that you deliver have to be in the end converted to RGB.
You can not carry colors that your monitor (RGB) won’t be able to reproduce.
Otherwise to control the RGB gamut of an YUV signal have no sense.
Rafael -
A color is “out of gamut” when the saturation is too high for the particular hue. In terms of YUV, for each value of U there are maximum and minimum allowed values of V. You must enable the “Excess Chroma” option in the Range Check to see this.
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Hi all
Thanks for all your replies. I got problem fix with the help of scopes (WFM 601E). It was the RGB levels and CMPST (luminance) which were crossing the levels. I had to set my scopes to diamond. And control the levels with RGB filters to fit in the diamond.
Regards
nitin -
Right.
All the colors out of the line linking the color boxes are illegal.
rafael
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