----- Original Message ----- From: "Elson T. Elizaga" <elson@xxxxxxxxxxx> To: "List for Photo/Imaging Educators - Professionals - Students" <photoforum@xxxxxxxxxxxxxxxxxx> Sent: Saturday, September 05, 2009 10:35 PM Subject: Managing photos with Adobe Premier : My photos is being used for an Adobe Premier presentation, but there is : a problem. If a photo shows lines, such as electric wires, they come out : jittery. More so if the lines are diagonal. When the photos are blurred, : the jittery effect decrease, but at the expense of reduction of : sharpness of the entire photo. : : All the photos are jpgs. I read a discussion about a similar problem but : the date is old: : : http://www.videoforums.co.uk/adobe-premiere-premiere-elements-after-effects/10791-adobe-premiere-6-5-jpeg-asf-help.html : : Anyone in the list has same experience? What is your solution? Would : converting the photos to bmp help? : : I'm not the person using the Adobe Premier, but someone else we have : asked to do the work. He has not found the solution, yet, and tomorrow : is Sunday. I hope to get help by Monday because the client is jittery : himself because of an approaching deadline. sounds like moire*, a common problem when images are downsampled using iffy algorithms BEST bet, work out what size they are to be used onscreen (say 800x600, 1024x768 - whatever) and down sample them using a better algorythm - that way what you see will be what you get. b-spline and s-spline are good for downsampling though even then sometimes you'll need to blur first (analagous to using an anti-aliasing filter ;) then resize down - sometimes in stages Unfortunately Adobe's algorithms are very rudimentary.. http://en.wikipedia.org/wiki/Moiré_pattern Unfortunately some video cards and OS's use a 3D graphic engine to represent even bitmapped images (which is what a jpeg is - a compressed bitmap) and then sadly, moire can be unavoidable without a lot of fiddling to correct it - worse still, some OS's / graphics cards can and do correct the imperfection to the viewer - effectively showing you a prettied up but flawed image :( Viewed on another computer with stricter controls of the vido signal the flaws will be revealed in jarring detail If you are a mac user I can't offer a suggestion for better algorithms if you are a windows user, Irfanview has a myriad of resizing algorithms available to play with. a guide to algorithms relating to upward interpolation - really, REALLY worth a look http://www.americaswonderlands.com/digital_photo_interpolation.htm downsampling can be a lot more difficult hope this helps karl
