which photo attribute is best?

IMHO, 'jpegPhoto' is a better choice, because it clearly specifies the intended image format.

Technically, the 'photo' attribute as defined in RFC1274 is encoded in a format that by now is certainly less common than jpeg. See RFCs 1274 and 2798 for details.

Of course, if you will be using a certain app that absolutely requires one or the other, then your choice is easy.

From RFC2798:

...

( 0.9.2342.19200300.100.1.60

NAME 'jpegPhoto'

DESC 'a JPEG image'

SYNTAX 1.3.6.1.4.1.1466.115.121.1.28 )

...

( 0.9.2342.19200300.100.1.7

NAME 'photo' )

Note: Photo attribute values are encoded in G3 fax format with an

ASN.1 wrapper. Please refer to RFC 1274 section 9.3.7 for

detailed syntax information for this attribute.

...

gtholberta at 2007-7-8 1:55:41 >