bug#24536: 25.1; cannot display JPEG image

[ynyaaa]

I installed emacs-25.1-i686-w64-mingw32.zip and
copied libjpeg-9.dll and libgif-7.dll into emacs bin directory.

JPEG images are not displayed in emacs buffer,
while GIF images are displayed.

Emacs says "Cannot display image: (Invalid image specification)".

DLLs are obtained from http://sourceforge.net/projects/ezwinports/files/,
archived in jpeg-v9a-w32-bin.zip and giflib-5.1.0-w32-bin.zip.

dynamic-library-alist's value is
((xpm "libxpm.dll" "xpm4.dll" "libXpm-nox4.dll")
 (png "libpng16.dll" "libpng16-16.dll")
 (tiff "libtiff-5.dll" "libtiff3.dll" "libtiff.dll")
 (jpeg "libjpeg-8.dll")
 (gif "libgif-7.dll")
 (svg "librsvg-2-2.dll")
 (gdk-pixbuf "libgdk_pixbuf-2.0-0.dll")
 (glib "libglib-2.0-0.dll")
 (gobject "libgobject-2.0-0.dll")
 (gnutls "libgnutls-30.dll")
 (libxml2 "libxml2-2.dll" "libxml2.dll")
 (zlib "zlib1.dll" "libz-1.dll"))




In GNU Emacs 25.1.1 (i686-w64-mingw32)
 of 2016-09-18 built on LAPHROAIG
Windowing system distributor 'Microsoft Corp.', version 6.0.6002
Configured using:
 'configure --host=i686-w64-mingw32 --without-dbus
 --without-compress-install CFLAGS=-static'

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND NOTIFY ACL GNUTLS LIBXML2 ZLIB
TOOLKIT_SCROLL_BARS

Important settings:
  value of $LANG: JPN
  locale-coding-system: cp932

Major mode: Dired by name

Minor modes in effect:
  shell-dirtrack-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message format-spec rfc822 mml mml-sec
password-cache epg epg-config gnus-util mm-decode mm-bodies mm-encode
mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047
rfc2045 ietf-drums mm-util help-fns mail-prsvr mail-utils advice
misearch multi-isearch dired-aux help-mode cl-loaddefs pcase cl-lib
shell pcomplete comint ansi-color ring thingatpt nxml-uchnm rng-xsd
xsd-regexp rng-cmpct rng-nxml rng-valid rng-loc rng-uri rng-parse
nxml-parse rng-match rng-dt rng-util rng-pttrn nxml-ns nxml-mode
nxml-outln nxml-rap nxml-util nxml-glyph nxml-enc xmltok image-mode
easymenu dired time-date mule-util japan-util tooltip eldoc electric
uniquify ediff-hook vc-hooks lisp-float-type mwheel dos-w32 ls-lisp
disp-table w32-win w32-vars term/common-win tool-bar dnd fontset image
regexp-opt fringe tabulated-list newcomment elisp-mode lisp-mode
prog-mode register page menu-bar rfn-eshadow timer select scroll-bar
mouse jit-lock font-lock syntax facemenu font-core frame cl-generic cham
georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech
european ethiopic indian cyrillic chinese charscript case-table epa-hook
jka-cmpr-hook help simple abbrev minibuffer cl-preloaded nadvice
loaddefs button faces cus-face macroexp files text-properties overlay
sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote w32notify w32 multi-tty
make-network-process emacs)

Memory information:
((conses 8 117010 8676)
 (symbols 32 22479 0)
 (miscs 32 61 205)
 (strings 16 22990 5108)
 (string-bytes 1 624970)
 (vectors 8 16640)
 (vector-slots 4 575211 7254)
 (floats 8 199 278)
 (intervals 28 1523 653)
 (buffers 520 23))