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Aliasing of Static Images

Apr 12, 2013 4:33 AM

Tags: #aliasing #static_image

I filmed a presentation where most of the content was slides scanned from old books and catalogs. To improve viewability I took the presenter's powerpoints, wrote them to .pdf and then individually scaled them in Photoshop. I then went into to each slide and saved the individual images as separate images (he had them all in .jpeg so I am stuck with that). It didn't look bad inside premiere but once I export it to an .mp4 the old images with lots of lines tend to crawl and its quite distracting. You did a little test video on the first slide:

 

https://vimeo.com/63505591

 

Anyone know the best way to stop this before I jump into editing. I don't have access to the original documents--just the scans that were embedded in the slides. Also since there are 80 slides I am hoping the suggestion won't be something like "rescale all 80+ slides."

 

Thanks for any suggestions.

 
Replies
  • Currently Being Moderated
    Apr 12, 2013 5:18 AM   in reply to John Ellenberger

    You could try adding a blur filter to the slides.

     
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    Apr 12, 2013 6:45 AM   in reply to John Ellenberger

    In the Premiere Effects tab there is a Blur and Sharpen folder. Try testing out Fast Blur appled to a silde then export to MP4.

     

    Screen Shot 2013-04-12 at 6.43.14 AM.png

     
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    Apr 12, 2013 6:48 AM   in reply to John Ellenberger

    Try adding, in Premiere, a Gaussian Blur found under Video Effects/Blur & Sharpen, adjust the amount until the pattering is reduced but the photo is still sharp enough. When you have found a good setting for one photo copy and paste attributes to the other stills.

     
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    Apr 12, 2013 9:23 AM   in reply to John Ellenberger

    This is not right.  You shouldn't need any effects for this to look good.

     

    What format is the video?  What are your sequence and export settings?

     
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    Apr 12, 2013 9:51 AM   in reply to John Ellenberger

    What is the resolution fo the original images? Since your sequence is SD, maybe the images are very high resolution thus creating the problem?

     
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    Apr 12, 2013 10:07 AM   in reply to John Ellenberger

    Nice fix. Congras!

     
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    Apr 12, 2013 10:21 AM   in reply to John Ellenberger

    The sequence setting is: 720 x 480  29.97 fps

     

    To output I was just using one of the Vimeo presets:  640x480, 25 fps, progressive vbr, 2 pass 2 Mbps

     

    Get the frame rates to match.

     
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