It sounds like XP automatically compresses the image, but it should never do
this. Are you sure that the image is originally 25 MB in size or do you just
estimate what its size *should* be? If you see an hourglass appearing it may
be because Window$ calculates the size of the file , not invoking any image
converters.
Roy
"Aaron" <au198295@hotmail.com> wrote in message
news:6cb32fc9.0402260820.1b0fed3@posting.google.com...
> I encountered something strange when exporting TIFF images from matlab
> (R13) and I'm hoping someone knows what is going on. I have been
> exporting 3D mesh plots as high resolution TIFF images (4800 X 3600
> Pixels, 600 DPI, 24 Bit Depth). The files that I get out for the
> plots I am looking at are generally around 25 MB. By chance I was
> looking at the properties of the file (I'm running Win XP), clicked on
> summary, then clicked OK to exit. XP then started operating on the
> file somehow (property windows stays open for several seconds and the
> mouse pointer turns into an hourglass), and afterward the file is only
> 5 MB or so. The images look identical to me, and the images
> properties (resolution, bit depth) are the same. I have tried this on
> three different computers (all run XP) by copying the image files from
> my computer with Matlab to the others and it happens on every one. I
> have also done this with mesh plots of other data and other types of
> plots and I see the same thing, but the file size reduction varies for
> different types of plots. It only occurs when I do the following:
> Right-Click on image file, Click on Properties, Click on Summary Tab
> in Properties, Click OK. If I omit going to the Summary tab and just
> click OK nothing happens. I tried this with BMPs as well but nothing
> happens. Does anyone know what is happening here?
>
> Thanks,
> AU
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