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Adding to @raphael favier 's answer, you can time capturing by:

term-1$ rosrun image_view image_saver image:=image_raw _save_all_image:=false _filename_format:=foo.jpg __name:=image_saver

Then only when you call the following, image files are generated:

term-2$ rosservice call /image_saver/save

I got a hint from start-jsk/jsk_apc/#9.

Adding to @raphael favier 's answer, you can time capturing by:

term-1$ rosrun image_view image_saver image:=image_raw _save_all_image:=false _filename_format:=foo.jpg __name:=image_saver

Then only when you call the following, image files are generated:

term-2$ rosservice call /image_saver/save

I got Got a hint from at start-jsk/jsk_apc/#9.