10 Replies Latest reply on Jan 13, 2011 8:54 AM by the_wine_snob

    Max Resolution or DPI of still images

    djwood91 Level 1

      Hi,

       

      This is an offshoot of a problem I thought I was having with Encore CS5 and transcoding, but it is also part of the solution.

       

      I was creating about a 30 min project on Premier CS5 with AVCHD and still images imported with a couple of mp3 music tracks. Win 7, GTX 295, 6MB Ram.

       

      I can do whatever I wanted in premier in terms of any jpeg could be imported, scaled, add motion, zoom, effects, whatever..

       

      When it was time to put it on a blu-ray, it would get send to Encore via the dynamic link and would always fail at seemingly random places during transcode and of course, ultimately crash, or come up with an "object not found" and ultimately never burn.

       

      I tried all the suggestions, taking spaces out of file names, burning to a blu-ray folder, and everthing else I could find in the forums.

       

      I also spent 2.5 hours with Adobe logged into my computer and they could not figure out why:

       

      ENCORE CS4 would transcode and burn the exact same project CS5 would choke on and fail.

       

      I had ignored the suggestion in the forum that Premier can't handle large image files.. After all, they seemed to load and work, I couldn't imagine that transcoding would fail on a still image at 4000X3000 and 300dpi, but wouldn't you know it, I resized all of my images to lower res, and bingo, CS5 churned and burned the blu-ray. I did notice after trying, that if it won't render in the work area of PPro CS5, that it would also fail in the transcoding in Encore CS5, but not CS4. If it didn't like a particular image, it would just freeze the render process and lock PPro CS5 right up.. After several image resizes and lots of reboots, it finally all rendered, and then it was fine in Encore CS5 after that.

       

      So this brings me to my point, and I would love an official answer or guideline from Adobe..

       

      What is the max resolution of still images that can be used in PPro CS5 and consequentally be handled in Encore CS5? What about dpi?

       

      Am I correct to assume that 300dpi is useless in HD? Meaning, even in true HD on a tv screen, isn't it still 72dpi? I couldn't figure out if it was the DPI or the dimensions of the  image it couldn't deal with. It seemed as long as I was around 2500X1500 and under 200 DPI I was ok.. but more than that was definately a show stopper. However, I would also think a 300dpi picture would be sharper and crisper, so this stinks that premier can't seem to deal with a 8-10 megapixel jpeg or image..

       

      I really can't believe it, I really thought Adobe would be ready for todays images from cameras, I mean I think nearly every camera you can put your hands on now shoots 8-10 megapixels which would put you right there in 4000X3000 and 300 dpi, how could Premier Pro CS5 and Encore choke on those? And more amazingly why does Encore CS4 not choke?

       

      D.J.

        • 1. Re: Max Resolution or DPI of still images
          Ann Bens Adobe Community Professional & MVP

          DPI has no meaning in video, al that counts is the dimension: the height and width in pixels.

          http://blogs.adobe.com/premiereprotraining/2010/07/maximum_dimensions_in_premiere.html

          • 2. Re: Max Resolution or DPI of still images
            Harm Millaard Level 7

            DPI is only relevant on paper, and meaningless with video. Only pixel dimensions count and with AVCHD (1920 x 1080) you want your stills to be around the same pixel dimensions. If you use larger dimensions it puts a heavy burden on your system and you will not use those dimensions in the end result. Better to scale your stills in PS before importing into PR.

             

            DPI on a 19" 1920 x 1080 monitor translates to rougly 97 DPI. On a 156" monitor with the same resolution it translates into about 12 DPI.

            • 3. Re: Max Resolution or DPI of still images
              the_wine_snob Level 9

              Once you have addressed the overly-large stills (this ARTICLE will give you some tips), I would also convert all MP3's to PCM/WAV 48KHz 16-bit, and replace those MP3's. This ARTICLE will give you a bit more background.

               

              PrPro can have issues with MP3's and so can Encore. Encore has all sorts of issues with almost any MPEG Audio, other than fully-compliant DD AC3's, and will often choke on them.

               

              Good luck,

               

              Hunt

              • 4. Re: Max Resolution or DPI of still images
                djwood91 Level 1

                Ann,

                 

                Thank you for the link to that article, and it sort of explains the limits, but it doesn't explain why an image off of a camera that was a jpg at 4000X3000 and 300dpi , which is about 10 megapixels and about 5MB in file size choked the transcode process, as it doesn't seem to be anywhere near the limits. As soon as I changed the images to something more like 2500X1200 and 180 dpi or less, everything was fine.

                 

                Could it have anything to do with cumulation? For example, I had about 20 of these images set up in a slide show sort of way, and added some motion to them in the effects.. Do you think that matters?

                 

                Also, the DPI in relation to video, as I said, it sure does seem that a larger image at 300 dpi offers quite a bit more clarity in the final product than something at a lower DPI..Especially in the case where I want to zoom in on the image or use some motion.. Maybe I'm nuts and a 72dpi 1920X1080 image is all I will ever need, but then in that case, it doesn't leave much room to be able to zoom in or out and move it around.. And if you do zoom in a lower quality image, then the quality will really be seen when it becomes part of the video.. Which is why I wanted to start with higher res stuff in the first place..

                 

                D.J.

                • 5. Re: Max Resolution or DPI of still images
                  Ann Bens Adobe Community Professional & MVP

                  Premiere CS3/4/5 has a feature for converting audio files to wave: Render and Replace.

                  • 6. Re: Max Resolution or DPI of still images
                    Ann Bens Adobe Community Professional & MVP
                    function(){return A.apply(null,[this].concat($A(arguments)))}

                    Could it have anything to do with cumulation? For example, I had about 20 of these images set up in a slide show sort of way, and added some motion to them in the effects.. Do you think that matters?

                    Yes definitly.

                    For panning and zooming make the image twice the size of the sequence setting.

                    If you want your images look a bit sharper. Add the Unsharpen Mask filter (80,4,1) to the Lightness channel in Lab Color Mode in Photoshop.

                    • 7. Re: Max Resolution or DPI of still images
                      Colin Brougham Level 6
                      ...it doesn't explain why an image off of a camera that was a jpg at 4000X3000 and 300dpi , which is about 10 megapixels and about 5MB in file size choked the transcode process, as it doesn't seem to be anywhere near the limits. As soon as I changed the images to something more like 2500X1200 and 180 dpi or less, everything was fine.

                       

                      You mention you're using a GTX295, which I'm going to assume you've "hacked" in order to use hardware MPE. If this is the case, that may be the cause of the crashes--not the hack itself, but the fact that using CUDA acceleration limits the size of images in relation to the amount of available memory on the GPU. Several of us had reported similar issues (even crashes) in earlier versions of CS5; the issues have been addressed somewhat, but there is still a real-world limitation on what you can do. This would be the possible explanation as to why you can encode the same project without problems in CS4--which didn't have hardware MPE (or any MPE, for that matter).

                       

                      If you are using hardware MPE with CS5, try changing your project settings to use only software MPE, and then re-attempt the encode.

                      • 8. Re: Max Resolution or DPI of still images
                        djwood91 Level 1

                        Ann,

                         

                        Yes, I agree and that seems straight forward, but as I said, that would make my image about 4000x3000 @ 300dpi if I was working in HD and those are the images straight off the camera, and exactly the ones that were choking Premier Pro CS5 during render, and also choking Encore CS5 (but not CS4) on the transcode.

                         

                        I wonder if setting them to exactly 3840X2160 @ 150dpi would help, as it would be exactly double the sequence setting for HD using AVCHD which is 1920X1080i.

                         

                        D.J.

                        • 9. Re: Max Resolution or DPI of still images
                          the_wine_snob Level 9

                          Yes it does, but many MP3's cause issues before one gets to that point. That is why I always convert all MP3 Assets to PCM/WAV 48KHz 16-bit outside of PrPro - that works 100% of the time. Though I do not work with MP3's that much (just hate that compression), 100% success is tempting to me.

                           

                          Thanks,

                           

                          Hunt

                          • 10. Re: Max Resolution or DPI of still images
                            the_wine_snob Level 9

                            When one is dealing with overly-large images, there are unnecessary pixels that need to be "pushed around." Add many of those, and one's resources are often used up. I eliminate any unnecessary pixels, to keep the processing load down, as much as I can.

                             

                            Good luck,

                             

                            Hunt