On Thu, 20 Jan 2005, Steven Boswell II wrote: > OK, I'm pretty sure I understand this. But > wouldn't I have to have 4:4:4 data (i.e. 720x480 > chroma data to go along with my 720x480 intensity
You only need 4:2:2 or 4:1:1, something that isn't subsampled vertically. 1:2 or 1:4 horizontal subsampling is ok. BTW, the zoran mjpeg cards produce 4:2:2 and DV is 4:1:1... > data) in order to fix the chroma properly? Can I > even get that? Also, when dealing with an NTSC Depends on what you mean by properly. If you subsampled chomra to 4:2:0 in progressive mode, then you can't create what you would have gotten if you had subsampled in interlaced mode to begin with. But you can upsample to 4:2:2, then downsample in interlaced mode and at least try to cope. It's better than leaving the chroma as it is and pretending it was interlaced. > signal of something that was originally 24 fps, > i.e. the "not really interlaced" case, wouldn't > the color be subsampled according to progressive > frame rules? NTSC is not chroma subsampled vertically. Native NTSC chroma format is considered to be 4:2:2. Of course NTSC is analog and digital things like 4:2:2 and 4:2:0 don't apply, but you get the idea. ------------------------------------------------------- This SF.Net email is sponsored by: IntelliVIEW -- Interactive Reporting Tool for open source databases. Create drag-&-drop reports. Save time by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, etc. Download a FREE copy at http://www.intelliview.com/go/osdn_nl _______________________________________________ Mjpeg-users mailing list Mjpeg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mjpeg-users
