Ihor Radchenko <yantar92@gmail.com> writes:

> "Christopher M. Miles" <numbchild@gmail.com> writes:
>
>>> Here is the prototype code which displaying image with text-property:
>>>
>>> #+begin_src emacs-lisp
>>> (put-text-property start end
>>>                    'display (create-image thumbnail nil nil :ascent 'center :max-height thumbnail-size))
>>> #+end_src
>>>
>>> - If this is some kind of internal mechanism of Emacs, can someone explain why?
>>>
>>> - If have some method to remove those horizontal lines. How to do it?
>
> Could you please detail the steps required to reproduce the problem,
> starting from emacs -Q?

Here is the steps to reproduce with "emacs -Q"

  1. =$ emacs -Q=
  2. install package =[M-x package-install RET org-link-beautify RET]=
  3. load the package =[M-x load-library org-link-beautify RET]=, 
     the package source code URL here: https://repo.or.cz/org-link-beautify.git
  4. open an Org file which has content which has a "file:" link to a video file (You can replace
     the video file link as yours) :
     #+begin_src org
     ,* headline 1

     link [[file:~/Downloads/3veEPJrQrV1EtpH9.mp4]]
     #+end_src
  5. enable minor mode =[M-x org-link-beautify-mode RET]=. This mode will auto thumbnail for video
     file and display it with /text-property/.
  6. The displayed thumbnail on link has a center-line.
  7. But open the generated thumbnail image file =file:.thumbnails/3veEPJrQrV1EtpH9.png= with external
     program, it does not have this center-line.

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