Hello and thanks for the clear answer. My work is targeted at the CGI industry so I will need to take this kind of format in account.
Would you recommend to first use an "ImageBuffer" with .".nsubimages()" to determine if the image need to have its subimages/miplevel processed and then use "ImageInput". OR just use "ImageInput" at first and just with "_seek_subimage()" see if there is multiple subimages/miplevel ? Cheers. Liam. Le dim. 7 févr. 2021 à 23:06, <oiio-dev-requ...@lists.openimageio.org> a écrit : > Send Oiio-dev mailing list submissions to > oiio-dev@lists.openimageio.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org > or, via email, send a message with subject or body 'help' to > oiio-dev-requ...@lists.openimageio.org > > You can reach the person managing the list at > oiio-dev-ow...@lists.openimageio.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Oiio-dev digest..." > > > Today's Topics: > > 1. SubImage and MipLevel (Liam) > 2. Re: SubImage and MipLevel (Larry Gritz) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sun, 7 Feb 2021 17:53:13 +0100 > From: Liam <lcol...@gmail.com> > To: "oiio-dev@lists.openimageio.org" <oiio-dev@lists.openimageio.org> > Subject: [Oiio-dev] SubImage and MipLevel > Message-ID: <dd5af729-0353-4855-87cc-c9b0db1fc...@hxcore.ol> > Content-Type: text/plain; charset="us-ascii" > > An HTML attachment was scrubbed... > URL: < > http://lists.openimageio.org/pipermail/oiio-dev-openimageio.org/attachments/20210207/66da84e6/attachment-0001.html > > > > ------------------------------ > > Message: 2 > Date: Sun, 7 Feb 2021 10:32:53 -0800 > From: Larry Gritz <l...@larrygritz.com> > To: OpenImageIO dev list <oiio-dev@lists.openimageio.org> > Subject: Re: [Oiio-dev] SubImage and MipLevel > Message-ID: <73e1ab98-ce17-42ea-b738-0d7ce44be...@larrygritz.com> > Content-Type: text/plain; charset="utf-8" > > Yes, a file can have both. They are not just different words for the same > thing. Subimages means that there are multiple, completely different images > in one file container (which may have different channel sets, totally > different metadata, etc). MIPmapping means that a (sub)image has multiple > copies of the image at a series of different resolutions (but that's the > only way that they'll differ). Each subimage can potentially be MIPmapped > or not, independently of all the other subimages. > > One example is "multi-part" OpenEXR files -- each "part" is what OIIO > calls a subimage, and they may be MIPmapped. > > Another example is Disney's PTex format -- the texture for each geometric > face is a subimage, and of course they are MIPmapped. > > That said, most image formats don't support either subimages or > MIPmapping, let alone both. So whether you need to care about it depends on > the range of file formats you might encounter. If you're writing a web > photo processing app that only will ever JPEG and PNG as input, say, then > maybe you don't need the complexity of handling more than one single image > in a file. > > > > On Feb 7, 2021, at 8:53 AM, Liam <lcol...@gmail.com> wrote: > > > > Hello, > > I am using the OIIO python bindings and I had a simple question: > > > > Can a file have multiple subimages AND multiples miplevel ? > > Or maybe each subimage can have multiple miplevels ? > > > > Or do I only need to care for one ? for example if I read an Image and > see multiple miplevels I assume that I don?t need to care about processing > subimages. > > > > Cheers. > > Liam Collod. > > -- > Larry Gritz > l...@larrygritz.com > > > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.openimageio.org/pipermail/oiio-dev-openimageio.org/attachments/20210207/8d9a7765/attachment-0001.html > > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > Oiio-dev mailing list > Oiio-dev@lists.openimageio.org > http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org > > > ------------------------------ > > End of Oiio-dev Digest, Vol 149, Issue 4 > **************************************** >
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