2020-12-12 20:14:19 +00:00
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---
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title: image_stack
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id: image_stack
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weight: 180
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draft: false
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author: "people"
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---
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## Name
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image_stack.lua - process a stack of images
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## Description
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This script provides another storage (export target) for darktable. Selected
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images are exported in the specified format to temporary storage. The images are aligned
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if the user requests it. When the images are ready, imagemagick is launched and uses
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the selected evaluate-sequence operator to process the images. The output file is written
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2020-12-19 03:08:09 +00:00
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to a filename representing the input files in the format specified by the user. The resulting
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2020-12-12 20:14:19 +00:00
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image is imported into the film roll. The source images can be tagged as part of the file
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creation so that a user can later find the contributing images.
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## Usage
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2020-12-19 03:08:09 +00:00
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* start this script using script manager
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* select the images to process with image_stack
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* in the export dialog select "image stack" and select the format and bit depth for the
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exported image
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* Select whether the images need to be aligned.
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* Select the stack operator
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* Select the output format
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* Select whether to tag the source images used to create the resulting file
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* Specify executable locations if necessary
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* Press "export"
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* The resulting image will be imported
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## Additional Software Required
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* align_image_stack - http://www.hugin.org
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* imagemagick - http://www.imagemagick.org
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## Limitations
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Mean is a fairly quick operation. On my machine (i7-6800K, 16G) it takes a few seconds. Median, on the other hand
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takes approximately 10x longer to complete. Processing 10 and 12 image stacks took over a minute. I didn't test all
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the other functions, but the ones I did fell between Mean and Median performance wise.
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## Author
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Bill Ferguson - wpferguson@gmail.com
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## See Also
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* Thanks to Pat David and his blog entry on blending images, https://patdavid.net/2013/05/noise-removal-in-photos-with-median_6.html
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