Rafael Amador
Forum Replies Created
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Hi Martin,
The main issue is that in RGB you can get color combinations that are only ‘theoretical”. i.e When you open the color-picker window in Photoshop with some color values some times you get a yellow triangel that means that this color mix (RGB) it can not be displayed. (The same happens when working with CMYK. When you get a yellow triangle that means that you can not get that color by mixing the four colors for printing).
The YUV color space is just a part RGB space. All the colors that you can get in YUV falls inside the RGB spectrum. But many colors from the RGB falls out of the YUV spectrum. So when you pass from RGB to YUV (or YCbCr) there are many colors that are mapped to the closet color avalaible.
Another issue is the “Broadcast safe “. In the digital domain you can manage values of bright and color that are not supported (?) when you pass to analog. So you must keep your signal between certain levels to avoid problems when broadcasting.
How to resolve those issues? I think there are only two things to do:
– Keep Broadcast safe in AE by using a VideoScope (for exaple Testgear).
– Export from AE with a YCbCr codec.
Cheers,
rafael -
Targas aTiffs are RGB, so better avoid it.
rafael -
You got a interlacing problem in your DVD. The problem can be because:
– The field-order of the footage is set wrong in the FC Brownser.
– The field-order of your sequence is set wrong (aparently not because DVNTSC is lower-first).
– The field-order in the Compressor preset is set wrong.
The first thing is to make sure is that FC is interpreting properly the field-order of your footage. If in the FC Brownser this is not properly set, your edit will be a mess. So try to conect your computer to a TV and look if the FC time-line play OK. Only in a interlaced monitor you can check if there is any interlacing problem.
When you have make that sure them go to Compressor and make sure as well that the field-order of the clip is properly set before to export the MPG2.
And don’t worry we are here to help you.
Cheers,
rafael -
Mike,
MPGStreamclip is a great piece of software. Not only to comvert from MPG2. Many people use it even to transcode NTSC to PAL, or in-between differnt QT formats.
When exporting (to QT movie) you can choose the codec that you want. I did recommend you 10/8 b Unc or DVCPro 50 because they are 422 codecs. At least you will get the most from your MPG2 (420) , mostly if you inted re-edit the clip. If you just export to DV the quality will be lower. Just make a little test and you will see the difference.
Cheers
Rafael -
Raj,
I think you are mistaking your question. When you export fro FC a RGB clip, your exporting 32b. 8b per color channel (RGB) plus 8b for the Alpha channel (If you are exporting Millions+). If you are exporting DV, the most part of the codecs use 8b to sample the Luma (Y) and the color components (Cb and Cr). In the case that the codec support Alpha channel (i.e, Sheer), also take 8b. If you use 10b Uncompresed, is all the same but using 10b per channel.
AE allows you to export with higher quality because with some codecs you can export 16 bits per channel, so a total of 64b.
So if your question is if you can export clips with Alpha channel from FC, the answer is yes, but you need to choose a codec that allows you export Millions+.
Cheers,
rafael -
Hi Mike,
What you need is MPGStreamclip. Free downlad. You can comvert the MPG2 in .mov files with the codec that suits you the best. If you go to re-edit the clip I recommend you use 10/8 b Uncompressed or at least DVCPro50.
Cheers,
Rafael -
What you get with MPGStreamclip when exporting to DV is a DV Sequence the same kind that the used by iMovie, not a .mov. If you are putting together good quality amimation from Motion, export your clip with a good quality codec from MPGStreamclip (8/10b Unc or at least DVCPro50). High data rate, but they are only 45″.
Capturing with your AJA you won’t get any improvement over exporting the clip with MPGStreamclip, just the same.
Cheers,
Rafael -
And how do you play 10b Unc in a TV?
It sounds like a interlacing problem. If you are not sure that the field-order is correct in your film, you can check it easyly in AE or Shake.
Rafael -
Whichs codec is the clip you are trying to play? And from what kind of computer?
Rafael -
Hi Bob,
Sorry I’ve never have done blue screens with DVCProHD but two possible solutions:
– Export from AE with a YCbCr codec. Your animator can install in his PC the Blackmagic codec that are free and compatible.
– Export just the Alpha channel from AE and make the composition in FC.
Cheers,
Rafael