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”.

Posted 2024-11-21 09:11 / Tags: Photo. / link

Encoding problems identified and corrected easily

So one customer's webpage showed odd characters in otherwise normal text, like “we’re”. No doubt this looked very much like an encoding error between ISO-8859-x/cp1252 and UTF-8; three characters and all being outside the ASCII plane is a hint to this.

Update 2016-02-05: I turned the fixing process into a program which speaks to me more than a full article: decode_mojibake_1252.c

Posted 2010-03-07 23:03 / Tags: Encoding, Sql. / link