{"id":4061,"date":"2013-02-12T12:50:19","date_gmt":"2013-02-12T16:50:19","guid":{"rendered":"http:\/\/starlightcascade.ca\/blog\/?p=4061"},"modified":"2013-05-21T11:42:18","modified_gmt":"2013-05-21T15:42:18","slug":"more-imagemagick-tricks","status":"publish","type":"post","link":"https:\/\/starlightcascade.ca\/blog\/2013\/02\/more-imagemagick-tricks\/","title":{"rendered":"More Imagemagick tricks"},"content":{"rendered":"

I am attempting to learn how to stack or combine or layer multiple images ontop of each other.
\nSpecifically to take all of the images of meteors taken throughout the night and put them together into a single image showing all of the meteors.
\nWe’ll start simply, with only two images taken from 2013 February 11th:<\/p>\n\n\n
<\/p>\n
\n<\/table>\n\n\n\n\n\n\n\n\n\n\n
The output should look something like this (this is 4 images put together manually in corel photopaint…whereas we want to automate the process under Linux).<\/p>\n\"Allsky2-4meteors\"<\/a><\/p>\n
Let’s try this command:
\nconvert ev_20130211_*.png +append ev_20130211.png<\/p>\n		\"ev_20130211convert_append\"<\/a>
\nThis takes two 640×480 images and turns it into a 1280×480 image side by side. Not what we want.<\/p>\n
Let’s try composite ev_20130211_*.png ev_20130211.png<\/p>\n\"ev_20130211composite\"<\/a>
\nNo.. that didn’t seem to work either<\/p>\n
montage -mode concatenate -tile 1x ev_20130211_*.png ev_20130211.png<\/p>\n\"ev_20130211montage\"<\/a>
\nNope.<\/p>\n
convert -combine ev_20130211_*.png ev_20130211.png<\/p>\n\"ev_20130211convert-combine\"<\/a><\/p>\n

Getting closer<\/p>\n

convert -flatten ev_20130211_*.png ev_20130211.png<\/p>\n\"ev_20130211flatten\"<\/a>
\nno.. lost the 2nd image<\/p>\n
convert -combine -compose over ev_20130211_*.png ev_20130211.png<\/p>\n\"ev_20130211composeover\"<\/a> nope<\/p>\n
convert ev_20130211_*.png -evaluate-sequence mean ev_20130211.png
\nThis is very close but dimmed<\/p>\n		\"ev_20130211mean\"<\/a><\/p>\n
convert ev_20130211_*.png -evaluate-sequence add ev_20130211.png<\/p>\n\"ev_20130211add\"<\/a>
\nthis looks good but after 5 or 10 images it turns all white (from the add function)
\n<\/table>\n

convert ev_20130211_*.png -evaluate-sequence max ev_20130211.png
\ngives us this result:<\/p>\n

\"ev_20130211max\"<\/a>
\nGot it!
\nThis is how to stack or combine multiple images from a nights run of meteor imaging into one single image that shows all of the meteors in one image.<\/p>\n

A better example is from 15 images from 2012 August 08:
\nconvert ev_20120808_*.png -evaluate-sequence max ev_20120808.png
\n\"ev_20120808max\"<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

I am attempting to learn how to stack or combine or layer multiple images ontop of each other. Specifically to take all of the images of meteors taken throughout the night and put them together into a single image showing all of the meteors. We’ll start simply, with only two images taken from 2013 February […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,15],"tags":[],"class_list":["post-4061","post","type-post","status-publish","format-standard","hentry","category-astronomy","category-tech"],"_links":{"self":[{"href":"https:\/\/starlightcascade.ca\/blog\/wp-json\/wp\/v2\/posts\/4061","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/starlightcascade.ca\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/starlightcascade.ca\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/starlightcascade.ca\/blog\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/starlightcascade.ca\/blog\/wp-json\/wp\/v2\/comments?post=4061"}],"version-history":[{"count":0,"href":"https:\/\/starlightcascade.ca\/blog\/wp-json\/wp\/v2\/posts\/4061\/revisions"}],"wp:attachment":[{"href":"https:\/\/starlightcascade.ca\/blog\/wp-json\/wp\/v2\/media?parent=4061"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/starlightcascade.ca\/blog\/wp-json\/wp\/v2\/categories?post=4061"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/starlightcascade.ca\/blog\/wp-json\/wp\/v2\/tags?post=4061"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}