Image Sequencer is an online tool for image processing -- based on the idea of a storyboard. Each modification makes a new copy of the image, resulting in a series of images showing each step. It is designed for use in browsers, as well as on the [Raspberry Pi](/pi-camera). This project is supported in part by the [NASA AREN project](/aren)

## Why

Image Sequencer is different from other image processing systems in that it's **non-destructive**: instead of modifying the original image, it creates a new image at each step in a sequence. This is because it:

* produces a legible trail of operations, to "show your work" for evidential, educational, or reproducibility reasons
* makes the creation of new tools or "modules" simpler -- [each must accept an input image, and produce an output image](https://github.com/publiclab/image-sequencer/blob/master/CONTRIBUTING.md)
* allows many images to be run through the same sequence of steps - batch processing
* works identically in the browser, on Node.js, and on the command line

Read more in-depth on the [Image Sequencer GitHub page](https://github.com/publiclab/image-sequencer).


[![diagram-workflows.png](https://publiclab.org/system/images/photos/000/023/784/large/diagram-workflows.png)](https://publiclab.org/system/images/photos/000/023/784/original/diagram-workflows.png)



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## Activities

[activities:image-sequencer]

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## Questions

[questions:image-sequencer]

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## NDVI

There's now an "NDVI" feature in MapKnitter -- a beta -- for converting the images you upload with the #NDVI equation. It's set up for red filters only right now, but more will come. 

Need help? Ask questions above!

How it looks:

![Screen_Shot_2018-05-07_at_12.16.38_PM.png](https://publiclab.org/system/images/photos/000/024/833/large/Screen_Shot_2018-05-07_at_12.16.38_PM.png)