Is there a limit on file size for a JPEG image?

[harbrimar]

Is there a file size limit for Jpegs imported into a sequence? I am experimenting with an image of the earth downloaded from the NASA site. The file size is 23.8mb and 10800x10800. The reason why I have left it so large is that I want to zoom in over 1000%. But when I open Objects & Animation all I have is the green frame and no image. Can anyone help?

[davegee]

Why not resize a COPY of the image and work your way down until it shows OK?

Try 50% - if that works OK try 75% - if that works OK try 87.5% etc.

Please let us know and we can try it on our PCs?

DG

[Lin Evans]

Hi,

The only limit is imposed by your computer system, and the 32 bit PTE limitation but most probably by your video card. I can load much larger images than 10,800 x10,800 on my system in PTE but I have 3 gigabytes of RAM on my video card and 32 gigabytes of system RAM.

Below is a screen capture of a 30,000 x 20,001 pixel image on my XP system which has a 2 gigabyte RAM video card and less than 4 gigabyte system RAM so there is something other than a PTE limitation happening in your case.

Best regards,

Lin

[harbrimar]

Thank you Lin & DG for your help. I have reduced the image by 50% so it is now 5400 x 5400 (8.84GB) and created a 500% zoom over 5 seconds and that plays on project screen and also in O&E but the 10800 size will only play in the project screen and nothing to be seen in O&A. I suspect it is my computer. All rather strange. I have Win7, 64bit, Nvidia Geforce GTX 650 ti card. Unable to attach zip files as they are too big.

Regards

Brian

[Lin Evans]

Hi Brian,

Do you know how much video RAM is on your GTX 650? That's probably the bottleneck. There are limits in terms of jpg file sizes (not PTE limits) such as older versions of Photoshop limited to 30,000 pixels, etc., but generally the issue revolves around video card limitations. The GTX 650 is a reasonably powerful graphics card but comes standard with one gigabyte RAM which may not be sufficient to load and process a really large jpg.

Years ago I worked with seriously large files in PTE and to do deep zooms the way I handled it was to crop the huge file at the points I wanted to zoom to and match subsequent slides visually by loading the original smaller jpg then a zoom out of the next size by placing them both in Objects and Animations then setting the opacity of each to about 50%. Next match them visually by manually zooming and positioning the second slide. Write down the numbers of the pan and zoom then delete the second slide in O&A and place it as slide two and type in the correct numbers for the pan and zoom to match the first slide. Set the opacity for the first slide back to 100% and then with a dissolve or quick transition to the second slide it appears that there has been no change so a zoom on slide two seems like a continuous zoom on slide one.

Doing this greatly facilitates doing deep zooms on huge files by breaking the high resolution large files into smaller segments which can easily be used with PTE without taxing either your own or other's systems.

I wrote a tutorial on doing this which can be found here as number 6 - Basics of Superzoom....http://www.picturestoexe.com/forums/index.php?/topic/7901-pte-made-easy-tutorials-continuously-updated/

Best regards,

Lin

[Ken Cox]

see lin's test

http://www.picturestoexe.com/forums/index.php?/topic/10995-testing-system/?pid=71063#entry71063

ken

[davegee]

Just out of interest I tried a shot that I had taken this morning as a full resolution JPEG (6000x4000) and zoomed into it over a twenty second duration.

Smooth as silk, and the resulting percentage at the end of the zoom is 370%.

I then upscaled the same JPEG to 10000 wide and did the same test. I got the same result - smooth zoom to 617%.

W7 i7 - nVidia GT545 with 3Gb Ram.

DG