bug#17483: 24.4.50; Emacs cannot display some gif images correctly under dark background

bug#17483: 24.4.50; Emacs cannot display some gif images correctly under dark background

[Tu, Do]

How to reproduce:

- emacs -q
- Choose any color theme with dark background: (load-theme 'tango-dark t)
- Download or open image at this url: http://www.openldap.org/doc/admin23/intro_tree.gif

Result: The image is deformed. Background becomes very dark, the nodes become gray. This is not expected.



In GNU Emacs 24.4.50.2 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
 of 2014-05-05 on xtuudoo-Satellite-L640
Repository revision: 117061 rgm@gnu.org-20140505010854-t7blwdpa40ejp0xh
Windowing system distributor `The X.Org Foundation', version 11.0.11501000
System Description:	Ubuntu 14.04 LTS

Configured using:
 `configure --with-x-toolkit=gtk'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GSETTINGS NOTIFY GNUTLS
LIBXML2 FREETYPE XFT ZLIB

Important settings:
  value of $LC_CTYPE: en_US.UTF-8
  value of $LC_MONETARY: en_US.UTF-8
  value of $LC_NUMERIC: en_US.UTF-8
  value of $LC_TIME: en_US.UTF-8
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8

Major mode: 1/1t sorting turned OFF

Minor modes in effect:
  helm-mode: t
  ipretty-mode: t
  cua-mode: t
  global-auto-highlight-symbol-mode: t
  golden-ratio-mode: t
  back-button-mode: t
  persp-mode: t
  show-paren-mode: t
  nyan-mode: t
  Info-breadcrumbs-in-mode-line-mode: t
  flx-ido-mode: t
  erc-truncate-mode: t
  erc-spelling-mode: t
  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-match-mode: t
  erc-button-mode: t
  erc-fill-mode: t
  erc-stamp-mode: t
  erc-netsplit-mode: t
  erc-irccontrols-mode: t
  erc-noncommands-mode: t
  erc-move-to-prompt-mode: t
  erc-readonly-mode: t
  which-function-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  nrepl-eval-sexp-fu-flash-mode: t
  eval-sexp-fu-flash-mode: t
  global-eclim-mode: t
  popwin-mode: t
  magit-auto-revert-mode: t
  global-linum-mode: t
  ido-vertical-mode: t
  global-highlight-parentheses-mode: t
  helm-descbinds-mode: t
  shell-dirtrack-mode: t
  helm-adaptative-mode: t
  helm-match-plugin-mode: t
  helm-occur-match-plugin-mode: t
  global-flycheck-mode: t
  flex-isearch-global-mode: t
  global-fasd-mode: t
  global-company-mode: t
  company-mode: t
  image-diredx-async-mode: t
  global-auto-complete-mode: t
  highlight-parentheses-mode: t
  flex-isearch-mode: t
  global-auto-mark-mode: t
  auto-mark-mode: t
  global-diff-hl-mode: t
  diff-auto-refine-mode: t
  winner-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  global-anzu-mode: t
  anzu-mode: t
  projectile-global-mode: t
  projectile-mode: t
  volatile-highlights-mode: t
  recentf-mode: t
  savehist-mode: t
  show-smartparens-global-mode: t
  global-auto-revert-mode: t
  delete-selection-mode: t
  prelude-global-mode: t
  prelude-mode: t
  global-srecode-minor-mode: t
  global-cedet-m3-minor-mode: t
  global-semantic-mru-bookmark-mode: t
  global-semanticdb-minor-mode: t
  global-semantic-idle-scheduler-mode: t
  global-semantic-highlight-func-mode: t
  semantic-mode: t
  tooltip-mode: t
  electric-indent-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
  buffer-read-only: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
C-h g l d a p M-p <return> C-s 1 h l m C-f <return> 
<tab> C-v C-v C-v C-v C-v C-v C-v C-v C-v C-v C-v C-v 
C-v C-v C-v M-v M-v M-v M-v C-v C-v C-n C-n C-p C-p 
C-p C-p C-n C-y C-g C-y C-y C-y C-y C-y C-y C-y C-y 
C-h k C-y C-g C-/ C-/ C-/ C-/ C-h <return> C-y <return> 
<down> <down> <down> <up> C-x k C-x C-g C-h <return> 
C-y <return> C-x d C-g M-! w g e t SPC C-y <return> 
C-x C-f i n t r o <return> <down> <down> <down> C-x 
k C-h <return> C-y <return> <down-mouse-4> <mouse-4> 
<double-down-mouse-4> <double-mouse-4> <triple-down-mouse-4> 
<triple-mouse-4> <triple-down-mouse-4> <triple-mouse-4> 
<triple-down-mouse-4> <triple-mouse-4> <triple-down-mouse-4> 
<triple-mouse-4> <down-mouse-5> <mouse-5> <double-down-mouse-5> 
<double-mouse-5> <down-mouse-5> <mouse-5> <double-down-mouse-5> 
<double-mouse-5> <triple-down-mouse-5> <triple-mouse-5> 
<down-mouse-1> <mouse-movement> <mouse-1> C-x k C-h 
<return> C-y <return> C-y <return> C-x k C-h <return> 
C-y <return> C-x k M-x <return>

Recent messages:
Type C-c C-c to view the image as text.
(No files need saving) [2 times]
Contacting host: www.openldap.org:80
(No files need saving)
byte-code: Beginning of buffer [6 times]
byte-code: End of buffer [5 times]
Contacting host: www.openldap.org:80
(No files need saving)
Mark set
Contacting host: www.openldap.org:80

Load-path shadows:
/home/xtuudoo/.emacs.d/elpa/easy-kill-20140505.343/test hides /home/xtuudoo/.emacs.d/elpa/iasm-mode-20131004.1944/test
/home/xtuudoo/.emacs.d/cedet/lisp/speedbar/loaddefs hides /home/xtuudoo/.emacs.d/cedet/lisp/eieio/loaddefs
/home/xtuudoo/.emacs.d/cedet/lisp/speedbar/loaddefs hides /home/xtuudoo/.emacs.d/cedet/lisp/cedet/loaddefs
/home/xtuudoo/.emacs.d/cedet/lisp/speedbar/loaddefs hides /usr/local/share/emacs/24.4.50/lisp/loaddefs
~/.emacs.d/personal/org/lisp/ob-calc hides /usr/local/share/emacs/24.4.50/lisp/org/ob-calc
~/.emacs.d/personal/org/lisp/org-indent hides /usr/local/share/emacs/24.4.50/lisp/org/org-indent
~/.emacs.d/personal/org/lisp/ob-awk hides /usr/local/share/emacs/24.4.50/lisp/org/ob-awk
~/.emacs.d/personal/org/lisp/ob-latex hides /usr/local/share/emacs/24.4.50/lisp/org/ob-latex
~/.emacs.d/personal/org/lisp/ob-lisp hides /usr/local/share/emacs/24.4.50/lisp/org/ob-lisp
~/.emacs.d/personal/org/lisp/ox-beamer hides /usr/local/share/emacs/24.4.50/lisp/org/ox-beamer
~/.emacs.d/personal/org/lisp/org-pcomplete hides /usr/local/share/emacs/24.4.50/lisp/org/org-pcomplete
~/.emacs.d/personal/org/lisp/org hides /usr/local/share/emacs/24.4.50/lisp/org/org
~/.emacs.d/personal/org/lisp/ob-tangle hides /usr/local/share/emacs/24.4.50/lisp/org/ob-tangle
~/.emacs.d/personal/org/lisp/ob-table hides /usr/local/share/emacs/24.4.50/lisp/org/ob-table
~/.emacs.d/personal/org/lisp/ob-ledger hides /usr/local/share/emacs/24.4.50/lisp/org/ob-ledger
~/.emacs.d/personal/org/lisp/ox-icalendar hides /usr/local/share/emacs/24.4.50/lisp/org/ox-icalendar
~/.emacs.d/personal/org/lisp/ob-sql hides /usr/local/share/emacs/24.4.50/lisp/org/ob-sql
~/.emacs.d/personal/org/lisp/org-macs hides /usr/local/share/emacs/24.4.50/lisp/org/org-macs
~/.emacs.d/personal/org/lisp/ob-keys hides /usr/local/share/emacs/24.4.50/lisp/org/ob-keys
~/.emacs.d/personal/org/lisp/org-agenda hides /usr/local/share/emacs/24.4.50/lisp/org/org-agenda
~/.emacs.d/personal/org/lisp/ob-matlab hides /usr/local/share/emacs/24.4.50/lisp/org/ob-matlab
~/.emacs.d/personal/org/lisp/org-ctags hides /usr/local/share/emacs/24.4.50/lisp/org/org-ctags
~/.emacs.d/personal/org/lisp/ox-texinfo hides /usr/local/share/emacs/24.4.50/lisp/org/ox-texinfo
~/.emacs.d/personal/org/lisp/ob-ruby hides /usr/local/share/emacs/24.4.50/lisp/org/ob-ruby
~/.emacs.d/personal/org/lisp/ob-lob hides /usr/local/share/emacs/24.4.50/lisp/org/ob-lob
~/.emacs.d/personal/org/lisp/org-faces hides /usr/local/share/emacs/24.4.50/lisp/org/org-faces
~/.emacs.d/personal/org/lisp/ob-R hides /usr/local/share/emacs/24.4.50/lisp/org/ob-R
~/.emacs.d/personal/org/lisp/org-element hides /usr/local/share/emacs/24.4.50/lisp/org/org-element
~/.emacs.d/personal/org/lisp/ob-sass hides /usr/local/share/emacs/24.4.50/lisp/org/ob-sass
~/.emacs.d/personal/org/lisp/org-habit hides /usr/local/share/emacs/24.4.50/lisp/org/org-habit
~/.emacs.d/personal/org/lisp/org-src hides /usr/local/share/emacs/24.4.50/lisp/org/org-src
~/.emacs.d/personal/org/lisp/ob-octave hides /usr/local/share/emacs/24.4.50/lisp/org/ob-octave
~/.emacs.d/personal/org/lisp/ox hides /usr/local/share/emacs/24.4.50/lisp/org/ox
~/.emacs.d/personal/org/lisp/org-bibtex hides /usr/local/share/emacs/24.4.50/lisp/org/org-bibtex
~/.emacs.d/personal/org/lisp/org-mobile hides /usr/local/share/emacs/24.4.50/lisp/org/org-mobile
~/.emacs.d/personal/org/lisp/org-bbdb hides /usr/local/share/emacs/24.4.50/lisp/org/org-bbdb
~/.emacs.d/personal/org/lisp/ob-ocaml hides /usr/local/share/emacs/24.4.50/lisp/org/ob-ocaml
~/.emacs.d/personal/org/lisp/ob-asymptote hides /usr/local/share/emacs/24.4.50/lisp/org/ob-asymptote
~/.emacs.d/personal/org/lisp/ob-mscgen hides /usr/local/share/emacs/24.4.50/lisp/org/ob-mscgen
~/.emacs.d/personal/org/lisp/org-attach hides /usr/local/share/emacs/24.4.50/lisp/org/org-attach
~/.emacs.d/personal/org/lisp/ob-org hides /usr/local/share/emacs/24.4.50/lisp/org/ob-org
~/.emacs.d/personal/org/lisp/ob-emacs-lisp hides /usr/local/share/emacs/24.4.50/lisp/org/ob-emacs-lisp
~/.emacs.d/personal/org/lisp/org-macro hides /usr/local/share/emacs/24.4.50/lisp/org/org-macro
~/.emacs.d/personal/org/lisp/org-entities hides /usr/local/share/emacs/24.4.50/lisp/org/org-entities
~/.emacs.d/personal/org/lisp/ob-comint hides /usr/local/share/emacs/24.4.50/lisp/org/ob-comint
~/.emacs.d/personal/org/lisp/org-archive hides /usr/local/share/emacs/24.4.50/lisp/org/org-archive
~/.emacs.d/personal/org/lisp/org-plot hides /usr/local/share/emacs/24.4.50/lisp/org/org-plot
~/.emacs.d/personal/org/lisp/ox-man hides /usr/local/share/emacs/24.4.50/lisp/org/ox-man
~/.emacs.d/personal/org/lisp/org-docview hides /usr/local/share/emacs/24.4.50/lisp/org/org-docview
~/.emacs.d/personal/org/lisp/org-list hides /usr/local/share/emacs/24.4.50/lisp/org/org-list
~/.emacs.d/personal/org/lisp/org-inlinetask hides /usr/local/share/emacs/24.4.50/lisp/org/org-inlinetask
~/.emacs.d/personal/org/lisp/org-footnote hides /usr/local/share/emacs/24.4.50/lisp/org/org-footnote
~/.emacs.d/personal/org/lisp/ob-java hides /usr/local/share/emacs/24.4.50/lisp/org/ob-java
~/.emacs.d/personal/org/lisp/org-timer hides /usr/local/share/emacs/24.4.50/lisp/org/org-timer
~/.emacs.d/personal/org/lisp/org-feed hides /usr/local/share/emacs/24.4.50/lisp/org/org-feed
~/.emacs.d/personal/org/lisp/org-gnus hides /usr/local/share/emacs/24.4.50/lisp/org/org-gnus
~/.emacs.d/personal/org/lisp/ob-css hides /usr/local/share/emacs/24.4.50/lisp/org/ob-css
~/.emacs.d/personal/org/lisp/ob-exp hides /usr/local/share/emacs/24.4.50/lisp/org/ob-exp
~/.emacs.d/personal/org/lisp/ob-maxima hides /usr/local/share/emacs/24.4.50/lisp/org/ob-maxima
~/.emacs.d/personal/org/lisp/org-compat hides /usr/local/share/emacs/24.4.50/lisp/org/org-compat
~/.emacs.d/personal/org/lisp/ob-scala hides /usr/local/share/emacs/24.4.50/lisp/org/ob-scala
~/.emacs.d/personal/org/lisp/org-protocol hides /usr/local/share/emacs/24.4.50/lisp/org/org-protocol
~/.emacs.d/personal/org/lisp/ob-C hides /usr/local/share/emacs/24.4.50/lisp/org/ob-C
~/.emacs.d/personal/org/lisp/org-table hides /usr/local/share/emacs/24.4.50/lisp/org/org-table
~/.emacs.d/personal/org/lisp/ox-latex hides /usr/local/share/emacs/24.4.50/lisp/org/ox-latex
~/.emacs.d/personal/org/lisp/ob-scheme hides /usr/local/share/emacs/24.4.50/lisp/org/ob-scheme
~/.emacs.d/personal/org/lisp/ox-html hides /usr/local/share/emacs/24.4.50/lisp/org/ox-html
~/.emacs.d/personal/org/lisp/ox-publish hides /usr/local/share/emacs/24.4.50/lisp/org/ox-publish
~/.emacs.d/personal/org/lisp/org-capture hides /usr/local/share/emacs/24.4.50/lisp/org/org-capture
~/.emacs.d/personal/org/lisp/ob-sqlite hides /usr/local/share/emacs/24.4.50/lisp/org/ob-sqlite
~/.emacs.d/personal/org/lisp/ob-fortran hides /usr/local/share/emacs/24.4.50/lisp/org/ob-fortran
~/.emacs.d/personal/org/lisp/ob-python hides /usr/local/share/emacs/24.4.50/lisp/org/ob-python
~/.emacs.d/personal/org/lisp/ob-gnuplot hides /usr/local/share/emacs/24.4.50/lisp/org/ob-gnuplot
~/.emacs.d/personal/org/lisp/ob-haskell hides /usr/local/share/emacs/24.4.50/lisp/org/ob-haskell
~/.emacs.d/personal/org/lisp/org-crypt hides /usr/local/share/emacs/24.4.50/lisp/org/org-crypt
~/.emacs.d/personal/org/lisp/org-datetree hides /usr/local/share/emacs/24.4.50/lisp/org/org-datetree
~/.emacs.d/personal/org/lisp/ob-io hides /usr/local/share/emacs/24.4.50/lisp/org/ob-io
~/.emacs.d/personal/org/lisp/ob hides /usr/local/share/emacs/24.4.50/lisp/org/ob
~/.emacs.d/personal/org/lisp/ob-js hides /usr/local/share/emacs/24.4.50/lisp/org/ob-js
~/.emacs.d/personal/org/lisp/org-rmail hides /usr/local/share/emacs/24.4.50/lisp/org/org-rmail
~/.emacs.d/personal/org/lisp/org-w3m hides /usr/local/share/emacs/24.4.50/lisp/org/org-w3m
~/.emacs.d/personal/org/lisp/ob-ditaa hides /usr/local/share/emacs/24.4.50/lisp/org/ob-ditaa
~/.emacs.d/personal/org/lisp/org-info hides /usr/local/share/emacs/24.4.50/lisp/org/org-info
~/.emacs.d/personal/org/lisp/ob-shen hides /usr/local/share/emacs/24.4.50/lisp/org/ob-shen
~/.emacs.d/personal/org/lisp/ox-org hides /usr/local/share/emacs/24.4.50/lisp/org/ox-org
~/.emacs.d/personal/org/lisp/ox-odt hides /usr/local/share/emacs/24.4.50/lisp/org/ox-odt
~/.emacs.d/personal/org/lisp/org-id hides /usr/local/share/emacs/24.4.50/lisp/org/org-id
~/.emacs.d/personal/org/lisp/ob-lilypond hides /usr/local/share/emacs/24.4.50/lisp/org/ob-lilypond
~/.emacs.d/personal/org/lisp/ob-core hides /usr/local/share/emacs/24.4.50/lisp/org/ob-core
~/.emacs.d/personal/org/lisp/ox-ascii hides /usr/local/share/emacs/24.4.50/lisp/org/ox-ascii
~/.emacs.d/personal/org/lisp/org-mhe hides /usr/local/share/emacs/24.4.50/lisp/org/org-mhe
~/.emacs.d/personal/org/lisp/ob-plantuml hides /usr/local/share/emacs/24.4.50/lisp/org/ob-plantuml
~/.emacs.d/personal/org/lisp/ob-clojure hides /usr/local/share/emacs/24.4.50/lisp/org/ob-clojure
~/.emacs.d/personal/org/lisp/ob-ref hides /usr/local/share/emacs/24.4.50/lisp/org/ob-ref
~/.emacs.d/personal/org/lisp/ob-dot hides /usr/local/share/emacs/24.4.50/lisp/org/ob-dot
~/.emacs.d/personal/org/lisp/ob-perl hides /usr/local/share/emacs/24.4.50/lisp/org/ob-perl
~/.emacs.d/personal/org/lisp/ob-picolisp hides /usr/local/share/emacs/24.4.50/lisp/org/ob-picolisp
~/.emacs.d/personal/org/lisp/org-install hides /usr/local/share/emacs/24.4.50/lisp/org/org-install
~/.emacs.d/personal/org/lisp/org-colview hides /usr/local/share/emacs/24.4.50/lisp/org/org-colview
~/.emacs.d/personal/org/lisp/ob-eval hides /usr/local/share/emacs/24.4.50/lisp/org/ob-eval
~/.emacs.d/personal/org/lisp/org-eshell hides /usr/local/share/emacs/24.4.50/lisp/org/org-eshell
~/.emacs.d/personal/org/lisp/ox-md hides /usr/local/share/emacs/24.4.50/lisp/org/ox-md
~/.emacs.d/personal/org/lisp/org-irc hides /usr/local/share/emacs/24.4.50/lisp/org/org-irc
~/.emacs.d/personal/org/lisp/ob-screen hides /usr/local/share/emacs/24.4.50/lisp/org/ob-screen
~/.emacs.d/personal/org/lisp/org-clock hides /usr/local/share/emacs/24.4.50/lisp/org/org-clock
~/.emacs.d/personal/org/lisp/ob-makefile hides /usr/local/share/emacs/24.4.50/lisp/org/ob-makefile
~/.emacs.d/personal/org/lisp/org-mouse hides /usr/local/share/emacs/24.4.50/lisp/org/org-mouse
/home/xtuudoo/.emacs.d/cedet/lisp/eieio/eieio-datadebug hides /usr/local/share/emacs/24.4.50/lisp/emacs-lisp/eieio-datadebug
/home/xtuudoo/.emacs.d/cedet/lisp/eieio/eieio-opt hides /usr/local/share/emacs/24.4.50/lisp/emacs-lisp/eieio-opt
/home/xtuudoo/.emacs.d/cedet/lisp/eieio/eieio-speedbar hides /usr/local/share/emacs/24.4.50/lisp/emacs-lisp/eieio-speedbar
/home/xtuudoo/.emacs.d/cedet/lisp/eieio/eieio hides /usr/local/share/emacs/24.4.50/lisp/emacs-lisp/eieio
/home/xtuudoo/.emacs.d/cedet/lisp/eieio/chart hides /usr/local/share/emacs/24.4.50/lisp/emacs-lisp/chart
/home/xtuudoo/.emacs.d/cedet/lisp/eieio/eieio-custom hides /usr/local/share/emacs/24.4.50/lisp/emacs-lisp/eieio-custom
/home/xtuudoo/.emacs.d/cedet/lisp/eieio/eieio-core hides /usr/local/share/emacs/24.4.50/lisp/emacs-lisp/eieio-core
/home/xtuudoo/.emacs.d/cedet/lisp/eieio/eieio-base hides /usr/local/share/emacs/24.4.50/lisp/emacs-lisp/eieio-base
/home/xtuudoo/.emacs.d/elpa/org-mac-iCal-20140107.519/org-mac-iCal hides ~/.emacs.d/personal/org/contrib/lisp/org-mac-iCal
/home/xtuudoo/.emacs.d/elpa/htmlize-20130207.2102/htmlize hides ~/.emacs.d/personal/org/contrib/lisp/htmlize

Features:
(shadow sort auto-capitalize mail-extr helm-misc emacsbug sendmail
helm-command image-mode misearch multi-isearch shr-color eww mm-url gnus
gnus-ems nnheader shr html2text timezone parse-time gnutls
network-stream starttls url-http tls url-gw url-cache url-auth
helm-google google ctags-update rainbow-mode xterm-color color
elisp-slime-nav number-font-lock-mode company-files company-oddmuse
company-keywords company-etags company-gtags company-dabbrev-code
company-dabbrev company-capf company-cmake company-ropemacs
company-xcode company-clang company-semantic company-eclim
company-template company-css company-nxml company-bbdb discover-my-major
makey google-translate-smooth-ui google-translate
google-translate-default-ui google-translate-core-ui
google-translate-core visual-regexp ace-link noflet easy-kill
persp-projectile calfw-org org-capture org-element avl-tree org-agenda
calfw holidays hol-loaddefs ggtags helm-mode ipretty cua-base
auto-highlight-symbol vlf-integrate golden-ratio zop-to-char dedicated
command-log-mode auto-complete-config pretty-lambdada back-button
mule-util persistent-soft list-utils pcache ucs-utils nav-flash
smart-window grandshell-theme register-list perspective iedit iedit-lib
linum-off occur-x syslog-mode hide-lines duplicate-thing paren morlock
nyan-mode info+ prelude-key-chord key-chord prelude-xml
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bug#17483: 24.4.50; Emacs cannot display some gif images correctly under dark background

[Andreas Schwab]

"Tu, Do" <tuhdo1710@gmail.com> writes:

> How to reproduce:
>
> - emacs -q
> - Choose any color theme with dark background: (load-theme 'tango-dark t)
> - Download or open image at this url: http://www.openldap.org/doc/admin23/intro_tree.gif
>
> Result: The image is deformed. Background becomes very dark, the nodes become gray. This is not expected.

I don't see why you think this is a bug.  The image is transparent, so
the background will show through.

Andreas.

-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."

bug#17483: 24.4.50; Emacs cannot display some gif images correctly under dark background

[Tu Do]

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Well, normal browsers do display it in a viewable way. Is it possible to
display transparent background as white background? Otherwise, it is
problematic for browsing the web with dark colour themes.

On Tue, May 13, 2014 at 3:21 PM, Andreas Schwab <schwab@suse.de> wrote:

> "Tu, Do" <tuhdo1710@gmail.com> writes:
>
> > How to reproduce:
> >
> > - emacs -q
> > - Choose any color theme with dark background: (load-theme 'tango-dark t)
> > - Download or open image at this url:
> http://www.openldap.org/doc/admin23/intro_tree.gif
> >
> > Result: The image is deformed. Background becomes very dark, the nodes
> become gray. This is not expected.
>
> I don't see why you think this is a bug.  The image is transparent, so
> the background will show through.
>
> Andreas.
>
> --
> Andreas Schwab, SUSE Labs, schwab@suse.de
> GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
> "And now for something completely different."
>

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bug#17483: 24.4.50; Emacs cannot display some gif images correctly under dark background

[Eli Zaretskii]

> From: "Tu, Do" <tuhdo1710@gmail.com>
> Date: Tue, 13 May 2014 14:59:38 +0700
> 
> - emacs -q
> - Choose any color theme with dark background: (load-theme 'tango-dark t)
> - Download or open image at this url: http://www.openldap.org/doc/admin23/intro_tree.gif
> 
> Result: The image is deformed. Background becomes very dark, the nodes become gray. This is not expected.
                                                               ^^^^^^^^^^^^^^^^^^^^^

This is a well-known optical illusion: the same gray shade looks more
bright on a darker background.  If you use some tool that shows color
pixels at certain screen location, you will see that the pixels are
exactly identical to what you get on the default (light) background.

There's no bug here.

bug#17483: 24.4.50; Emacs cannot display some gif images correctly under dark background

[Eli Zaretskii]

> Date: Tue, 13 May 2014 15:53:48 +0700
> From: Tu Do <tuhdo1710@gmail.com>
> 
> Well, normal browsers do display it in a viewable way.

If you describe how do they do that (e.g., do they use a background
that is different from the default?), then perhaps someone could
implement something similar in Emacs.

bug#17483: 24.4.50; Emacs cannot display some gif images correctly under dark background

[Andreas Schwab]

Eli Zaretskii <eliz@gnu.org> writes:

> If you describe how do they do that (e.g., do they use a background
> that is different from the default?),

They can't be customized.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

bug#17483: 24.4.50; Emacs cannot display some gif images correctly under dark background

[Eli Zaretskii]

> From: Andreas Schwab <schwab@linux-m68k.org>
> Cc: Tu Do <tuhdo1710@gmail.com>,  17483@debbugs.gnu.org
> Date: Tue, 13 May 2014 19:44:19 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > If you describe how do they do that (e.g., do they use a background
> > that is different from the default?),
> 
> They can't be customized.

Yes, that always helps.

bug#17483: 24.4.50; Emacs cannot display some gif images correctly under dark background

[Tu Do]

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I think viewing transparent gif image currently in Emacs is fine as it is,
since the example image should be used in a light background to view its
content. What I meant is about fixing Eww, since I encountered this issue
in it. I think at least Eww background should be defaulted to white, not
the background color of the current color theme. The default background
color for a web browser is also white if no background color is defined in
css. It would help in viewing many plain text web pages with transparent
images.


On Wed, May 14, 2014 at 12:52 AM, Eli Zaretskii <eliz@gnu.org> wrote:

> > From: Andreas Schwab <schwab@linux-m68k.org>
> > Cc: Tu Do <tuhdo1710@gmail.com>,  17483@debbugs.gnu.org
> > Date: Tue, 13 May 2014 19:44:19 +0200
> >
> > Eli Zaretskii <eliz@gnu.org> writes:
> >
> > > If you describe how do they do that (e.g., do they use a background
> > > that is different from the default?),
> >
> > They can't be customized.
>
> Yes, that always helps.
>

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bug#17483: 24.4.50; Emacs cannot display some gif images correctly under dark background

[Stefan Monnier]

>> If you describe how do they do that (e.g., do they use a background
>> that is different from the default?),
> They can't be customized.

Actually, Iceweasel's default background can be customized (you rarely
see it since most webpages override the default, but for example
http://www.iro.umontreal.ca/~monnier/ uses the default).  Yet I just
tried to view http://www.openldap.org/doc/admin23/intro_tree.gif in my
Iceweasel and it doesn't use my customized default background color.
So, indeed, it looks like Iceweasel's default gif background can't
be customized.


        Stefan

bug#17483: 24.4.50; Emacs cannot display some gif images correctly under dark background

[Lars Ingebrigtsen]

Tu Do <tuhdo1710@gmail.com> writes:

> I think viewing transparent gif image currently in Emacs is fine as it
> is, since the example image should be used in a light background to
> view its content. What I meant is about fixing Eww, since I
> encountered this issue in it. I think at least Eww background should
> be defaulted to white, not the background color of the current color
> theme. The default background color for a web browser is also white if
> no background color is defined in css. It would help in viewing many
> plain text web pages with transparent images.

It's true that traditionally web browsers have defaulted to a light
background, but that's kinda changing now with the popularity of "dark"
themes.

But in any case, I think eww should default to the background colour the
user has chosen, so I don't think there's any bug here to be fixed.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no