Hi! I haven't done this my self, but in the docs for 1.8.x it says that ImageBuf may be initialized with defined subimage and/or miplevel.
buf = oiio.ImageBuf(filename, subimage, miplevel) Hope this helps On Mon, Mar 12, 2018 at 10:22 AM, Alexis PRAYEZ <apra...@brunchstudio.tv> wrote: > Hi all, > > New around here, even thou I worked with oiio occasionally over the last > years, but I'am kinda stuck. > Someone asked almost the same question a while ago ( > http://lists.openimageio.org/pipermail/oiio-dev- > openimageio.org/2016-December/000832.html ) and the bottom line was > >> >> You can't "get an ImageBuf from an ImageInput", but you shouldn't need to > > > So it means I am probably doing something wrong: > > I am generating jpeg previews from hundreds of textures (exr, tx ...) and > this is painfully slow (the process is bound by network, as reading a 200mb > texture from the server is 10 times slower than doing the resizing. > > Since most of these textures have already been mipmapped, I would like to > only load the 512*512 mipmap level and write it back. But from what I > understood only ImageInput allows you choose what to load. > If I read all pixels from the ImageInput then "manually" create an > ImageBuf from it (requiring an extra numpy convert of the data) it works > but feel a bit convoluted. > > Is there a better way to do this ? > > Cheers, > > -- > > Alexis Prayez > > 41 rue de l'Echiquier - 75010 PARIS > <http://maps.google.com/maps?q=41+rue+%C3%A9chiqiuer+75010> > http://www.brunchstudio.tv/ > > STATEMENT OF CONFIDENTIALITY > The information contained in this electronic message and any attachments > to this message are intended for the exclusive use of the addressee(s) and > may contain confidential or privileged information. > If you are not the intended recipient, you are hereby notified that any > dissemination, distribution or copying of this e-mail and any attachment(s) > is strictly prohibited. Please reply to the sender and destroy all copies > of this message and any attachments from your system. > > Please consider the environment before printing this e-mail. > > _______________________________________________ > Oiio-dev mailing list > Oiio-dev@lists.openimageio.org > http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org > > -- -Daniel
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