Notes on photo sphere/panoramic EXIF metadata

• Google's EXIF/XMP metadata tag specification for panoramic images
• Panorama images with sky are to have a negative value for the CroppedAreaTopPixels tag. (The panoramic viewer of Facebook ignores the value altogether, though, and assumes the horizon in the middle of the picture.)
• If a camera or software normally produces panoramic images with cylindrical projection, then doing a vertical capture actually produces a transverse cylindrical image. There is no standardized value for the EXIF ProjectionType field to cover this. (One option is to reproject them to equirectangular — which, again, is not very well supported.)
• Facebook's document on what tags to set
• The Facebook web interface insists that FullPanoHeightPixels be half the size of FullPanoWidthPixels. Else you get “no new photos were uploaded”.

/ Tags: Photo.

Filesystems. The larger disks get, the longer you spend in reconstruction. I will formulate today's thesis: Eventually, as disks get larger, they fail before the RAID reconstruction is complete. That would set a practical limit for the maximum size of a single disk. Furthermore, As the data set grows larger, some part of it will fail before the filesystem check is done. So in essence, we will be hitting logistic barriers before physical ones. Neat. Posted 2012-06-07 22:06 / link