Flashy Lines in Picture

troppo · Post by **troppo** » Thu Dec 07, 2006 1:43 am

I am doing a slow zoom into a picture of a house plan. To 'zoom' I am using the moving path to simply enlarge the picture. The finished video file is an MPEG2 at 4:3 DVD standard (Vbr 6000)
However, the horizontal lines in the plan seem to appear and disappear as the picture enlarges. The result is any horizontal lines look like they are flashing. It looks really crappy, is there a specific setting in the MPEG advanced settings to get rid of the flashiness?
Cheers,

sjj1805 · Post by **sjj1805** » Thu Dec 07, 2006 2:02 am

Try using the crop filter instead and using keyframes to adjust the amount of 'zoom'

heinz-oz · Post by **heinz-oz** » Thu Dec 07, 2006 2:05 am

It may be the interlacing that's causing your symptoms, try frame based.

sjj1805 · Post by **sjj1805** » Thu Dec 07, 2006 2:12 am

Also apply flicker-reduction.
To do this place the image on your timeline, right click and choose
"Media Source Options"

troppo · Post by **troppo** » Thu Dec 07, 2006 2:16 am

Thanks guys for the quick replies.
Steve, I don't think the crop filter will work, as I want to slowly zoom into the picture, ie. I want the picture to get larger. The crop filter just changes the amount of black around the picture.
Heinz, I tried changing the drop down box in the advanced settings to enable deinterlacing, is this what you mean by frame based? It didn't work.
I just tried to render to avi, same problem. Then I tried to do the same effect in Premiere Pro, same problem. Unless I can get it looking good, I'll have to show each plan without zooming in.
I wonder if it could be a limitation of my LCD monitors, not having fine enough pixel resolution to smoothly transition from one frame to another. But as the finished product is to be projected, it will be on LCD anyway.
Hmm, annoying.

sjj1805 · Post by **sjj1805** » Thu Dec 07, 2006 2:29 am

It can be done with the crop filter - you have to uncheck the option box
'Fill color' - then you need to apply all 3 suggestions given

1. Use the crop filter with the 'fill Color' option box unchecked
2. use Frame Based (Also selected via the Media Source Options Dialog)
3. Apply Flicker Reduction.

Trust me - it will work

troppo · Post by **troppo** » Thu Dec 07, 2006 2:29 am

ok, I just had a brainwave. Obviously, I was thinking the higher the resolution for the picture the better it will look when scaled down to fit the screen, so I had the .tif images of the plans set to a massive 1422x2188. But as I have been noticing elsewhere on this project when inserting logos, the image can look quite ratty when scaled down to 720x576 using moving path.
I resized the images in photoshop, to a height of 576. Inserted into the timeline and bingo! smooth zoom. Yay, I am happy again!
Again, thanks for your quick replies chaps.

sjj1805 · Post by **sjj1805** » Thu Dec 07, 2006 2:32 am

The re-sizing option is number 4 on the list.
If you are going to do a deep zoom you need a larger picture to take into account the 'zoom' for a simple static image you get best results by resizing to the screen size.

GeorgeW · Post by **GeorgeW** » Thu Dec 07, 2006 2:32 am

troppo wrote:ok, I just had a brainwave. Obviously, I was thinking the higher the resolution for the picture the better it will look when scaled down to fit the screen, so I had the .tif images of the plans set to a massive 1422x2188. But as I have been noticing elsewhere on this project when inserting logos, the image can look quite ratty when scaled down to 720x576 using moving path.
I resized the images in photoshop, to a height of 576. Inserted into the timeline and bingo! smooth zoom. Yay, I am happy again!
Again, thanks for your quick replies chaps.

I think you'll also notice an increase in rendering speed when using lower-resolution images. Once I was using some really high-res pics, and rendering was moving at a snails pace. I batched scaled them down, and it made the rendering much quicker.

ymmv,
George

troppo · Post by **troppo** » Thu Dec 07, 2006 2:43 am

wow, why didn't anyone tell me there was a flicker reduction button!!
"Where have you been all my life!"
Cool, thanks Steve, next time you are in Oz, I'll buy you a beer!