[Extensions]
Plugin Failed Warning=0
Ask Flash Download=0
Plugins=0
...
[State]
Accept License=1
Reading Plugins=0
Run=1
...
Xvfb :2 -screen 0 1280x1024x24
export DISPLAY=:2.0
/usr/bin/opera -nomail -nosession -disableinputmethods -geometry 1280x1024 -fullscreen "http://habrahabr.ru"
xwd -root -display :2.0| xwdtopnm | pnmtojpeg -quality=90 -optimize > /home/web/jj/img/temp.jpg
xwd -root -silent | xwdtopnm | pamcut -left=5 -right=1260 -top=83 -bottom=1023 | pnmtojpeg -quality=85 -optimize > /home/web/jj/img/habr.jpg
Source: https://habr.com/ru/post/62261/