Re: [Openexr-devel] Tile Sizes vs. Mipmap Levels

[Florian Kainz]

Angus Taggart wrote:
> In the Bonita.exr sample image, there are 10 mipmap levels.  Is it 
> correct to assume that the tile XY sizes are the same for each mipmap 
> level?  There doesn't seem to be a function in the API for retrieving 
> tile XY size as a function of mipmap/ripmap level.
>
> Thanks,
> Angus


The tile size is the same across all mipmap or ripmap levels.
Setting an image's tile size affects all levels.

Note that some tiles may extend across a level's right or bottom
edge.  Those tiles are incomplete; pixels beyond the level's edge
are not stored in an OpenEXR file, and the IlmImf library never
reads or writes the frame buffer memory locations that correspond
to those pixels.

For more information, see http://www.openexr.com/details.html or
http://www.openexr.com/details.print.html; look for "In tiled files,
the image is subdivided", about half way down from the top of the
document.

Florian