The [Infragram Sandbox](http://infragram.org/sandbox) is a browser based tool for experimenting with image compositing, intended for use with Public Lab [Infragram cameras](/wiki/infragram). Read [this research note](/notes/warren/08-17-2013/infragrammar-compositing-infrared-images-with-simple-mathematic-expressions#c6664) 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](/wiki/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](/notes/warren/08-24-2013/infragrammar-with-hsv-color-model)) * (add yours here) ###Math Infragrammar can use [JavaScript math functions](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math). 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. [](http://publiclab.org/system/images/photos/000/001/174/original/Screen_Shot_2013-08-17_at_11.52.00_AM.png)...
| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| warren | "Hmm, i once saw this with a different camera, where the filter was helping to pressure the lens into place, and removing it let the lens rock back ..." | Read more » | almost 10 years ago | |||
| theowallis | "Just a friendly warning for those of you looking to attempt this conversion, I did this last week, it wasn't too hard to smash the ir blocker out b..." | Read more » | almost 10 years ago | |||
| mathew | "I tried acetone, ethanol, and hot air, none moved the glue. " | Read more » | almost 10 years ago | |||
| WhiteRabbit | "Would acetone or some other solvent dissolve the glue holding on the IR blocker so that it can be removed without shattering it? Is it known what ..." | Read more » | almost 10 years ago | |||
| cfastie | "The only filter I tried that worked was Wratten 25A. Two blue filters worked poorly. @mathew has tried Rosco #19 which seems to work well. I don't ..." | Read more » | almost 10 years ago | |||
| WhiteRabbit | "" I can try different filters to learn how to make the best plant health images." Which filters have you found that make the best plant health ima..." | Read more » | almost 10 years ago | |||
| warren | "Here is Mathew's PDF on conversion, as well, for reference: mobius_instructions.pdf " | Read more » | about 10 years ago | |||
| mathew | "I was having trouble getting the white balance settings to load. figured it out from a manual editing page on RC groups: http://www.rcgroups.com/fo..." | Read more » | about 10 years ago | |||
| cfastie | "Thanks, download works! Mathew, The white balance settings for both of your Mobius shots at infragram.org are 288, 256, 432. That suggests the came..." | Read more » | about 10 years ago | |||
| warren | "Added! " | Read more » | about 10 years ago | |||
| warren | "Ah, good call. There are a zillion features we need to add to Infragram, but I think i can add that one reasonably fast. Let me try. " | Read more » | about 10 years ago | |||
| cfastie | "I couldn't find a way to download Mathew's original Infragram from Infragram.org. Is there a way? All I could get was the result image. " | Read more » | about 10 years ago | |||
| mathew | "sure image is here. " | Read more » | about 10 years ago | |||
| warren | "Yeah that doesn't look like it's working at all -- can you link to your Infragrammar.org image so I can try to debug? " | Read more » | about 10 years ago | |||
| mathew | "This formula doesn't produce anything like NDVI for me. I always get an image that looks the same as unprocessed, with some artifacting. " | Read more » | about 10 years ago | |||
| cfastie | "You're right, that would be a revealing test. In the example you referred to (below), the red channel should be three times more sensitive than th..." | Read more » | about 10 years ago | |||
| ttaylor | "you know, if the little color filters in Mobius cmos sensor Bayer array have the same spectral response as some of the CCD sensors I've seen around..." | Read more » | about 10 years ago | |||
| ttaylor | "Wow, that was quick. Too bad about the Mobius not doing raw. I feel like a I have decent handle on the Canons, but the Mobius is so light and po..." | Read more » | about 10 years ago | |||
| cfastie | "Tom, Maybe it would also be useful to you to have DNG images (via CHDK) from my full spectrum Canon A810? " | Read more » | about 10 years ago | |||
| cfastie | "Hi Tom, I didn't capture RAW with the S95, and the Mobius does not do RAW (although the firmware is open source, so it's possible). I could capture..." | Read more » | about 10 years ago | |||
| ttaylor | "Chris, do you have raw versions of these images I could look at? " | Read more » | about 10 years ago | |||
| mathew | "Ok-- I have the ROSCO Fire filter and several others in my swatch booklet. Going to run tests tomorrow, and try digging into the white balance pre..." | Read more » | about 10 years ago | |||
| mathew | "Nice writeup, thanks Chris. I like the tip on focusing, hadn't tried that. " | Read more » | about 10 years ago | |||
| patcoyle | "Very nice use of 3D design and printing for a specific one-off project. Exemplary. " | Read more » | about 10 years ago |