Loss of detail when rendering

jkb242 wrote on 4/19/2007, 6:52 PM
I am editing a short piece that I am attempting to finish for a client who needs a WMV output. I am using a standard 4:3 aspect ratio rendering with a 320X240 frame with pixel ratio of 1since the primariy playback will be on a PC and rendering out to an uncompressed AVI file before converting to WMV.

I am seeing a loss of detail in the uncompressed AVI which surprises me. Even in several still frames of a digital picture that I took with a 7Meg. pixel digital camera. The picture is quite sharp and looks normal in the preview window and the trimmer but there is a definite loss of sharpenss in the uncompressed rendered file.

Project settings are no deinterlacing, lower field, 320X240 29.97 frame rate; rendering settings are the same except for the field I have entered None (progressive scan). I have noticed that if I do not select this rendeirngsetting, viewing the file on the monitor, I see rats teeth whic is elimiated with this setting.

I am really not happy with the lack of sharpness, can some one please advise as to what may be causing this?

Thanks so very much!!

Jerry

Comments

jrazz wrote on 4/19/2007, 7:01 PM
Try this and post back.

Render out the uncompressed avi to the actual frame size that it was filmed in and then convert from there to the 320x240 wmv file. But, before the conversion see how the avi looks. I would think that you lose out on quality by shrinking the original footage to fit 320x240 as those pixels have to go somewhere. What avi type are you rendering to? Try the Sony YUV AVI.

j razz
jkb242 wrote on 4/19/2007, 7:20 PM
jrazz,

thanks for the fast reply..I am rendering to the uncompressed AVI format in Vegas and I am set for best resolution.



jkb242 wrote on 4/19/2007, 7:24 PM
2nd reply-----

After checking a bit further, it appears that only one clip (so far) is exhibiting the horrible rats teeth. Using the exact same settings to render the other clips does not produce these artifacts. Any suggestions in this area as to why one clip is acting this way? I have checked the settings numerous times and everything seems to be identical.

Thanks again!!

Jerry
Laurence wrote on 4/19/2007, 7:44 PM
Maybe the clip properties on that on clip are set to interlaced.
fldave wrote on 4/19/2007, 8:32 PM
Now that you say "rats teeth":

Resizing and some effects always invokes the Project Properties deinterlace setting, from what I understand. For fast motion, Interpolate works best, otherwise, set it to Blend.

Also set Project Properties, Video tab, to Best Quality. In your Render As custom setting Video tab, make sure that is set to Best also.
jkb242 wrote on 4/19/2007, 8:53 PM
Much thanks for the reply.
jkb242 wrote on 4/19/2007, 8:56 PM
thanks for the reply. I am still uncertain what causes this except it does seem to be related to re-sizing even if one stays with some multiple of the original footage in which it was shot.

Everything is set for best as you said. I really did not want to render out the uncompressed AVI to full size due to size but it appears that this will be necessary to better manage screen sharpness.

thanks again.
fldave wrote on 4/19/2007, 8:58 PM
If your deinterlace setting is set to "None", then that is what is causing the "rats teeth". You need Blend or Interpolate.
Laurence wrote on 4/19/2007, 9:27 PM
Now the "rats teeth" definately sounds like an interlace resizing problem. When you resize from 480 to 240 lines, that throws away one field and automatically deinterlaces for you even if you don't set up a deinterlace. The one exception is if you try zooming in or resizing your original footage. Then you need to set up the project to deinterlace. You may have inadvertently zoomed in on that one problematic clip.