Flicker on modified speed clips and still photos

This particular clip has a railing of a building so there are lots of straight lines. It has a very slight flicker when at 100%, but when I change it to 75 it really flickers. The flicker filter doesn't help. I tried adding a blur as one post said to do but that didn't seem to fix it either.
Also - I have had a persistent problem with flicker on motion keyfraned still photos, esp. if the image has straight edges or thin lines. Has anyone been able to fix this issue?
Thx
Message was edited by: Editgrrl2

The flickering is an artifact of the interlaced nature of video. It is a result of very thin (often horizontal) elements that exist on one scanline as is common in text or titling. This can also be the case in scanned images with great deal of detail with high contrast.
As the alternate fields play, the flashing element is essentially being turned on/off. The basic strategy is to get the element to exist over two scanlines so it is refreshed every time the field plays or to reduce the amount of contrast so the difference between ON and OFF is not noticeable.
Things to try (In increasing order of image degradation)
• (in FCP) field order>none
• (in FCP or Photoshop) reduce whites by 10% - reduces overly bright areas
• (in FCP) flicker filter - minimum
• (in Photoshop) motion blur>vertical> .2 - .5 pixels - blurs vertically only
• (In FCP or Photoshop) Gaussian blur> .2 - .5 pixels -blurs both horizontally as well as vertically
• (in FCP or Photoshop) deinterlace - throws away half the image and is generally not appropriate on scanned images
If you have slowed your material significantly, and have not used some sort of frame blending/optical flow processing, you may be simply duplicating frames to create the additional material to pad the playback. The flashing you see is the result of this.
Remember: Unless you are viewing your work in the appropriate external NTSC/PAL monitor, you are playing blind. The computer monitor only shows you a proxy image.
good luck.
x

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