What should I do when I create a slideshow to avoid flickering edges/lines? at DVinfo.net

Lars Siden · August 27th, 2003, 12:17 PM

Hi,

I Recently created some slideshows using Vegas. Just dropped about a 100 pics on the time line and added a default transition and a music track. So far so good ;-)

When I view it on a TV set, all sharp edges and lines flickers.... can I reduce this somehow? Should I "interpret footage" ? Deinterlace? something else?

As always, all your input is highly appreciated!

Best regards,

Lazze Z

Sweden

Gints Klimanis · August 27th, 2003, 01:31 PM

A progressive scan TV set or DVD player would take care of this in
your home. As for other homes, you'll need to soften your edges and reduce the magnitude of interframe motion. Horizontal lines need to cover at least three scan lines to avoid the worst flickering on an interlaced display. That means that your image edge features should be at least three pixels high. Even if your
image features are that wide, some titling will still have jagged edges that will flicker, though it's not as bad as a long horizontal line. You'll need to blend, anti-alias, whatever your features.
This will yield somewhat fuzzy edges, but the flickering will be less noticeable. If you can manage to reduce contrast of the edges relative to the background, the flickering will also be less apparent.

Peter Jefferson · August 28th, 2003, 05:26 AM

u can also seelct to "reduce interlace flicker" within vegas

or run a blend field routine thru the render as mentioned

Lars Siden · August 29th, 2003, 10:50 AM

Hi,

Thanks for your replies!

Progressive Scan TV? I have a Philips 32" Widescreen 100 hz TV, that should be progressive ( or at least hold-scan )... but it flickers alot ...

Will try with some antialiasing and reduce interlace flicker the next time!

Just bought some DVD -R medias real cheap here in sweden 11 SEK ( 1.30$ ) - bought 25 on a spindle!

Have a great weekend!

// Lazze

August 27th, 2003, 12:17 PM	#1
Lars Siden Major Player Join Date: Mar 2003 Location: Sweden, Stockholm Posts: 469	What should I do when I create a slideshow to avoid flickering edges/lines? Hi, I Recently created some slideshows using Vegas. Just dropped about a 100 pics on the time line and added a default transition and a music track. So far so good ;-) When I view it on a TV set, all sharp edges and lines flickers.... can I reduce this somehow? Should I "interpret footage" ? Deinterlace? something else? As always, all your input is highly appreciated! Best regards, Lazze Z Sweden __________________ Sony HDR-CX130,Canon 5DMKII,i7 930@4.0, 12gb memory, 3x SSD + 2x1Tb(stripe), Geforce 480, Dual 24", Win 7 x64

August 29th, 2003, 10:50 AM	#4
Lars Siden Major Player Join Date: Mar 2003 Location: Sweden, Stockholm Posts: 469	Hi, Thanks for your replies! Progressive Scan TV? I have a Philips 32" Widescreen 100 hz TV, that should be progressive ( or at least hold-scan )... but it flickers alot ... Will try with some antialiasing and reduce interlace flicker the next time! Just bought some DVD -R medias real cheap here in sweden 11 SEK ( 1.30$ ) - bought 25 on a spindle! Have a great weekend! // Lazze __________________ Sony HDR-CX130,Canon 5DMKII,i7 930@4.0, 12gb memory, 3x SSD + 2x1Tb(stripe), Geforce 480, Dual 24", Win 7 x64

August 27th, 2003, 01:31 PM	#2
Gints Klimanis Inner Circle Join Date: Jun 2003 Location: San Jose, CA Posts: 2,222	A progressive scan TV set or DVD player would take care of this in your home. As for other homes, you'll need to soften your edges and reduce the magnitude of interframe motion. Horizontal lines need to cover at least three scan lines to avoid the worst flickering on an interlaced display. That means that your image edge features should be at least three pixels high. Even if your image features are that wide, some titling will still have jagged edges that will flicker, though it's not as bad as a long horizontal line. You'll need to blend, anti-alias, whatever your features. This will yield somewhat fuzzy edges, but the flickering will be less noticeable. If you can manage to reduce contrast of the edges relative to the background, the flickering will also be less apparent.

August 28th, 2003, 05:26 AM	#3
Peter Jefferson Inner Circle Join Date: Apr 2003 Location: Aus Posts: 3,884	u can also seelct to "reduce interlace flicker" within vegas or run a blend field routine thru the render as mentioned