In that case, then it sounds to me like the right thing is happening... it's
letting him close the file without writing all the tiles, and it's letting him
open it later, but he's getting error messages about the missing tiles when he
tries to read.
I don't believe that "Unable to read tile: x/y" comes from OIIO, so presumably
Michael's app is noticing the failure return code from ImageInput::read_tile()
and issuing that error. Instead, perhaps it should just accept that failure
and infer that the tile was never written to the file (however it wants to
handle that case).
-- lg
On Nov 4, 2013, at 2:08 PM, Piotr Stanczyk <[email protected]> wrote:
> Hi,
>
> libIlmImf requires that you provide the domain of definition information a
> priori; failure to to fill all of the specified region will generate what is
> considered to be an ill-formed image.
> An application responsible for reading the image file may handle the case
> gracefully, for example, by informing the user of the missing
> tiles/scanlines, or catastrophically or somewhere in between.
>
> Piotr
>
>
>
> On 3 November 2013 21:06, Larry Gritz <[email protected]> wrote:
> Sorry for the delay in answering.
>
> Is this intended? I can't speak for the underlying OpenEXR library,
> libIlmImf, but OIIO doesn't really make any promises one way or the other
> about what should happen if you open a file for output but fail to write all
> the scanlines or tiles.
>
> OIIO is pretty straightforward in its operation... each call to
> ImageOuput->write_tile will write one tile. If you fail to write all the
> tiles in the image region, then I guess it's up to IlmImf about whether that
> produces a valid file or not. Perhaps it makes a valid file, but one that
> will fail to read the tiles that were never written?
>
> -- lg
>
>
>
> On Oct 22, 2013, at 4:05 AM, Michel Lerenard <[email protected]>
> wrote:
>
> > Hi
> >
> > i've stumbled across a problem i don't understand. I cannot save a tiled
> > image in EXR or TIFF if I don't fill all the area defined in the ImageSpec.
> > If I try to open the file I get lots of messages "Unable to read tile:
> > $x/$count".
> >
> > I would have thought that all tiles would be created for the canvas set in
> > the ImageSpec, and that I would need to call "write_tiles" for the
> > meaningful parts of the image only. ( for example if you only render a cube
> > in the corner of the image, you would need to write only the tiles that
> > contains the images of the cube)
> >
> >
> > Is this the intended behavior ?
> >
> > Thanks
> >
> > Michel
> >
>
> --
> Larry Gritz
> [email protected]
>
--
Larry Gritz
[email protected]
_______________________________________________
Oiio-dev mailing list
[email protected]
http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org
