# Infragram Sandbox

The Infragram Sandbox is a browser based tool for experimenting with image compositing, intended for use with Public Lab Infragram cameras.

Read this research note and watch this short video to get a quick idea of how to use it:

## Infragrammar

Infragram Sandbox uses simple math expressions, which are actually written in JavaScript. Here are some examples:

- NDVI =
`(R-B)/(R+B)`

for -1..1, or for 0..1`(((R-B)/(R+B))+1)/2`

in the Monochrome input - ENDVI =
`((R+G)-(2*B))/((R+G)+(2*B))`

which MaxMax uses for its vegetation stress cameras, in the Monochrome input - A colormapped NDVI, scaled to emphasize differentiation:
`((R-B)/(R+B)-0.2)*-720`

, in the Hue input, and tweaking the 0.2 value to between 0.1 and 0.9 (read more here) - (add yours here)

### Math

Infragrammar can use JavaScript math functions. These include:

`Math.log()`

- logarithms`Math.abs()`

- absolute value`Math.sin()`

- sine

### Sliders

You can also link an equation to a slider; for now we are using the letter "X" to represent this value, but in the future, any string represented as {mystring} will generate a slider called "mystring". Move the slider to try different values in real time.