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Image quality issues revisited
DV images fed through my vegas 6 to a monitor look great. By the time I have edited them – with no effects – and used standard settings in Vegas and DVDA [for PAL] and burnt to disk I have a different story. The images are very dissapointing quality wise. Colour is flat, the sharpness is off and they just look plain dull to me, especially against the original.
Has anyone else had this problem or is it my workflow.
ThxI’ve been out of a ction for a week. Back into it now…
Further to your question Ed…Here are the settings –
Template – Pal DV [720 x 576, 25 fps]
Field order – Lower first
Rendering quality – Best
Motion blur type – Gausian
De interlace method – Blend field===========
Using Main Concept CodecRendering MPEG 2 settings
Video rendering quailty – Best
720 x 576 – 25 fps
Display 4:3
I- Frame 12 B.frame 2
Profile – main
Field order – Interlace, bottom field first. Level- main level first
Video quality – High
Variable Bit Rate –
Max- 8,000
Average – 76,000
Minimum – 192.000The images are flat – lack saturation and have lost a decernable amout of sharpness.
geoffjak -
5 Replies
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I sure hope
Max- 8,000
Average – 76,000
Minimum – 192.000
is a misprint and that you meant to say
Max – 8,000,000
Avg – 6,000,000
Min – 192,000.BTW, I’d bump the Min up to 2,000,000.
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Yes, a missprint…:( should be 6,000
OK I’ll bump up the minimum.
Are you getting great looking DVD’s from your original material?
Good colour saturation and sharpness of image.
Thx
geoffjak -
Are you getting great looking DVD’s from your original material?
No problems here. I looked back at your original post and see that you’re shooting with a 3 chip DVcam. I shoot with a JVC DV-550U so I have great footage (quality wise) as well. For example, I shot a fashion show last weekend at my kids grade school. Due to budget problems (i.e. none), the “spotlights” were a pair of overhead projectors. All things considered, it loooked suprisingly good!!
One more thing to try. You say that your videos are from 5-20 min. Try using a CBR (constant bit rate) of 8,000,000 instead of the VBR settings you posted. The videos are so short that you can afford to max things out. Make sure to set the “Video Quality” slider to it’s highest setting (31) as well. I believe it defaults to 15.
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Thx Mike
I will try that tomorrow morning and let you know how I go. Yes, you are right, there is a lot of space left over on a 4.7Gb disk so I’ll give the contant bit rate of 8million a go and the set the “Video Quality” slider to it’s highest setting of 31. Here’s hoping
More soon -
Did the test!…Not a lot has changed. We still have problems with the setting set to CBR 8,000,000l and Best setting 31.[this is in PAL]
Analyzing it, I see the black levels are still too high, ie not black, the image lacks contrast [possibly because of the reduced black level] and saturation is down.
Also I notice a slight jitter in pans, even slow ones, and people movement across screen is slightly jittery. Also an interlace flicker. The type you get when doing an NTSC / PAL conversion- you can actually notice the interlace lines on moving head tops and other objects. Yet all this has been done in the what seems to be correct PAL settings in Vegas and DVDA 3.All scenes were colour corrected using Vegas 6d CC, Secondary CC, vectorscope and waveform. We see that the scopes are set to Studio 16-235. Our DVD’s are for screening on a TV, not computer screens so should we uncheck that box? I just did so and notice the blacks are now upped about 10%, from 0% when checked for 16-235 setting. After all we did do the CC for 16-235.[7.5 IRE is not checked as that’s for NTSC right?].
Another test. Rendered the same CC’d timeline to avi then to tape. The contrast on the tape to monitor [same as used for DVD to screen] shows better contrast [better blacks] and better colour saturation. So peeling back the layers, it appears i have a problem in the transfer from Vegas timeline to mpeg2 render or in the actual burn.
BTW, how valuable do you find the Colour Curves Fx plugin? I’ve just used it and it looks like a very efficient way of getting good results quickly.
I’d appreciate your thoughts.
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