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:
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.
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.
I actually tried this and the blur really gets rid of detail quickly and it doesn't stop the aliasing on the encoded version. I had it set at 1. Anything more and most detail was gone.
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
I was poking around a little and I discovered something that seems to work.
I didn't try either of the interlace options but a colleague suggested that the problem was related to the two different fields and that fiddling with the interlacing might help. Not sure what flicker removal does but the flicker is gone and most of the detail still seems to be there.
I don't think it has much to do with image scale. These old images have a lot of diagonal "hatching" in the backgound which was a way of doing shading with no color or grayscale. I think its like when a subject wears a certain patterned outfit--the fine diagonal lines interact with the A/B scan and you get an aliasing effect that causes the image to flicker.
But I'm not really an expert on such things.