The variable image-mode-hook does not exist, so I can't easily add a hook to image mode. This is using Emacs 24.2.1 on Fedora 18.
Here are the details from M-x report-emacs-bug, just in case:
In GNU Emacs 24.2.1 (x86_64-redhat-linux-gnu, GTK+ Version 3.6.4)
of 2013-07-14 on buildvm-05.phx2.fedoraproject.org
Windowing system distributor `Fedora Project', version 11.0.11303000
Configured using:
`configure '--build=x86_64-redhat-linux-gnu'
'--host=x86_64-redhat-linux-gnu' '--program-prefix='
'--disable-dependency-tracking' '--prefix=/usr' '--exec-prefix=/usr'
'--bindir=/usr/bin' '--sbindir=/usr/sbin' '--sysconfdir=/etc'
'--datadir=/usr/share' '--includedir=/usr/include'
'--libdir=/usr/lib64' '--libexecdir=/usr/libexec'
'--localstatedir=/var' '--sharedstatedir=/var/lib'
'--mandir=/usr/share/man' '--infodir=/usr/share/info' '--with-dbus'
'--with-gif' '--with-jpeg' '--with-png' '--with-rsvg' '--with-tiff'
'--with-xft' '--with-xpm' '--with-x-toolkit=gtk3' '--with-gpm=no'
'--with-wide-int' 'build_alias=x86_64-redhat-linux-gnu'
'host_alias=x86_64-redhat-linux-gnu' 'CFLAGS=-DMAIL_USE_LOCKF -O2 -g
-pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector
--param=ssp-buffer-size=4 -m64 -mtune=generic' 'LDFLAGS=-Wl,-z,relro ''
Important settings:
value of $LC_ALL: nil
value of $LC_COLLATE: nil
value of $LC_CTYPE: nil
value of $LC_MESSAGES: nil
value of $LC_MONETARY: nil
value of $LC_NUMERIC: nil
value of $LC_TIME: nil
value of $LANG: en_US.UTF-8
value of $XMODIFIERS: nil
locale-coding-system: utf-8-unix
default enable-multibyte-characters: t
Major mode: Image[svg]
Minor modes in effect:
erc-list-mode: t
erc-menu-mode: t
erc-autojoin-mode: t
erc-ring-mode: t
erc-networks-mode: t
erc-pcomplete-mode: t
erc-track-mode: t
erc-track-minor-mode: t
erc-match-mode: t
erc-netsplit-mode: t
erc-hl-nicks-mode: t
erc-button-mode: t
erc-fill-mode: t
erc-stamp-mode: t
erc-irccontrols-mode: t
erc-noncommands-mode: t
erc-move-to-prompt-mode: t
erc-readonly-mode: t
global-auto-revert-mode: t
shell-dirtrack-mode: t
recentf-mode: t
show-paren-mode: t
global-auto-complete-mode: t
tooltip-mode: t
mouse-wheel-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
column-number-mode: t
line-number-mode: t