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On Tue, 20 Feb 2001 tom smith <email@hidden> wrote: >I have been asked to look at the feasibility of using quicktimeVR to present >microscope slide images. The images are VERY big (they use a special >camera), allowing students to roam and zoom in, looking for anomalies. > >Small quicktimeVR versions of the images have been proven to work well. >http://22.214.171.124:8080/otherscope/original_slide > >But as soon as the images get big, I run into problems. > > size 4072 x 2712 pixels >BMP source file 197.4 MB >saved as JPEG 50% quality 8.4 MB >saved as JPEG 0% quality 1.3 MB ----------------------------------------------- Tom, I think I'm missing something here - my calculations indicate an image with a (4072 x 2712) pixel dimension should be 31.6 megs in size; a file with that same aspect ratio pumped to 197.4 megs would be (10,152 x 6,793) pixels in size. VR Worx 2.0 will allow panos with dimensions up to 3,000 pixels high x 10,000 pixels wide which would handle the (4072 x 2712) pixel size you gave in your specs. Assuming that I missed something on the pixel/file size relationship, why not simply create several panos: * Master Pano -One with a general overview of the whole image (which would still show a lot of detail with a 32 meg file) * Detail panos - Divide the large 197.4 image divided into 6 sections with a nice overlap. When zoomed in on a pano and panning to an edge, hot spots on the edge would take you to the next node (section) in the corresponding place. By placing a series of linear hot spots along a given edge you could maintain a reasonable amount of control over where the viewer ends up in the next node without a disorienting jumping around. * Once you have created one of these multinode scenes. You can save it as a template and simply swap in and out whatever group of pictures you want (assuming the new images have the same resolution/pixel size). * The collection of smaller images would be less demanding on the viewer's hardware/software set-up. This problem seems to have generated some interest, I certainly haven't worked with a single image in the 200 meg range for QTVR work. It will be interesting to hear what ends up being a good solution for you. Good Luck! Jim Scott
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