Flicker fixing

4 replies [Last post]
BrianH
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Joined: Jun 27 2002

Anyone got any tips about how to fix screen flicker when you use scanned still photographs as part of a Premiere project? I've done all the obvious stuff, including saving the pics at the project size (720x576) reducing the colour saturation in Photoshop, applying the PAL broadcast colors filter in Premiere, ticking the flicker removal checkbox in the Clip>Video>Field Options dialog. None of it makes much difference, and most of the photographs I include show up on the TV monitor and on videotape with patches of extreme flickering (usually where there's a lot detail). I'm using a Buz video card with an old beige G3 Mac.

Gavin Gration
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Joined: Jul 29 1999

Apply a slight vertical blur to the image.

Alan Roberts at work
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Joined: May 6 1999

That's the right advice. The tv signal is interlaced, so alternate lines down the picture exist in alternate fields at 25Hz. Fine detail that shows up on only one line will twinkle at you at 25Hz, a very visible frequency. Vertical softening will fix it, and the same amount of horizontal softening will help to reduce ringing as well.

BrianH
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Joined: Jun 27 2002

Thanks for the replies guys. I can see the logic behind the vertical blur technique, and I've tried it with many different degrees of blur; from next to nothing to to point where the picture is almost unrecognisable. Unfortunately, none of it had much effect. The same areas still flickered like mad in the output video.

I ended up using the radial blur filter in Ptotoshop set to 90degrees on the original images because Premiere was going to take two hours to render 15 stills used for four seconds each after I added the blur filter to each one in the timeline.

I've reached the point where this is all too time consuming I may have to live with the flicker unless anyone can suggest a different technique.

rbarry
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Joined: Mar 27 1999

Brian,
Apply the deinterlace filter in photo shop, where you can choose to duplicate the odd or even fields or try using the brightness filter in premiere without altering the filter settings.

[This message has been edited by rbarry (edited 01 July 2002).]