We present K′-band surface photometry of a sample of 31 inclined Sa-Scd
galaxies, together with additional J- and H-band data for four of them. In
this first paper of a series, profiles are presented, together with global and
isophotal parameters. Our profiles are compared to similar B, R and I
data collected from other sources. Three galaxies exhibit previously unknown
small bars in their center, while in five others, such bars may also be
present. Four objects present a narrow elongated feature in their center
aligned with their major axis, which could be an inward extension of the disk.
A few galaxies display very thin spiral arms. Color-color diagrams indicate
that the extinction inside the four galaxies for which we have JHK′ images is
limited to AV​<2.Comment: Accepted in Astronomy and Astrophysics (Supplements). 11 pages LaTeX
with l-aa style file and 3 figures included. Figure 4 (35 pages of figures
taking over 3.5 MB uuencoded gzipped tared) is available at
ftp://ftp.iap.fr/pub/from_users/gam/PAPERS/hsm_fig4.u