>I'm assembling a time lapse video from several thousand images. >Unfortunately, there was a problem with the camera and roughly half of >these images are shifted up on the X axis by several pixels (creating a >jitter). Instead of using fancy software such as Adobe After Effects, >I'd like to script something with image magick to identify which images >are shifted and then automatically "fix" these images. The problem I'm >having is identifying which ones are shifted. My initial thought was to >obtain the color of a certain reliable pixel in every image and use that >to determine which ones are shifted, however I can't seem to figure out >how to do that in image magick. > >Is it possible? Is there are better approach?
IM has a compare function to compare two images or two single-pixel images. see compare at http://www.imagemagick.org/script/compare.php http://www.imagemagick.org/Usage/compare/#compare compare -metric rmse image1.png[1x1+10+10] image2.png [1x1+10+10] null: will compare one pixel at position 10,10 from the upper left corner and return the rmse difference. you can also compare the whole images, but that is slower. To fix it you would have to either subsection the odd image and fill with black or some other color or roll the image and then fill with black. convert image1.png -crop NEWWIDTHxNEWHEIGHT+XOFF+YOFF -gravity xxx -background black -extent OLDWIDTHxOLDHEIGHT +repage result.png see http://www.imagemagick.org/Usage/crop/#crop http://www.imagemagick.org/Usage/crop/#extent _______________________________________________ Magick-users mailing list [email protected] http://studio.imagemagick.org/mailman/listinfo/magick-users
