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Infragram FAQ

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Long form, community generated answers to frequently asked questions about the Infragram project on Kickstarter

Title Author Updated Likes
How to calibrate the white-balance for NDVI using the BLUE filter? @cagiva 3 months ago
I am getting very low NDVI values. @Anice 3 months ago
Infragram Point and shoot photos: white balance not working @Muneeswaran 4 months ago
Need insight on using this lens on modded camera for NDVI: OCN (Orange+Cyan+NIR) filter @alanw 8 months ago
Best low cost camera for indoor plants? @DrC 8 months ago
Is it possible to calculate average NDVI in a picture using infragram's sand box? @Hala73 12 months ago
Problem with filter for Raspberry Pi NoIR Camera @sjmanosalvas about 1 year ago
Why do the plant colors look the way they do? @jenhu about 1 year ago
Which RGB channel is the near-infrared saved in for the red and blue filter? @jenhu about 1 year ago
Camera module for Computer Vision/LED Plant Measurement System @SangHo about 1 year ago
600 year old cedar tree - Infragram @Randall about 1 year ago
How can I can make a raspberry pi camera just with the filters process the crops and immediately produce the results to a computer or to other device, without having to use the website? @csteran about 1 year ago
How to make this picture in an NDVI image @Davide_Ferrante about 1 year ago
Add a filter on a Pi NoIR camera @fsxskillz about 1 year ago
How can I validate the NDVI images @Aman007 about 1 year ago
buying Infragram filter pack in UK @ruya about 1 year ago
How to get NDVI image by image src instead of choosing image ? @Ankita about 1 year ago
Can these filter packages be adapted to Raspberry Pi cameras? @sjmanosalvas about 1 year ago
Visible Atmospherically Resistant Index (VARI) @rway over 1 year ago
Camera that would detect at 1064nm? @jpschaaf over 1 year ago
Can Infragrams be used to count coconuts/crop productivity? @James_Vagabond over 1 year ago
How can I have a value of NDVI starting from a IR picture? I want to find a numeric value of NDVI in pictures teken with a normal camera without IR filter. is it possible? @giuliooooo over 1 year ago
Can I use a Raspberry Pi with the Pi Noir camera to make NDVI images? @warren over 1 year ago
How big is the filter in the infragram DIY filter pack? @robotfarms over 1 year ago
I need a help I'm doing a research project on NVDI processes @camiloreyes over 1 year ago
AstroPlant RPi sensory system @Sidney_AstroPlant almost 2 years ago
"Test images" for multispectral image processing @warren almost 2 years ago
Transmission & other related information of the Red Filter @suman almost 2 years ago
What is the algorithm used in generating the fastie colormap from NDVI in Infragram? @Jtaw about 2 years ago
Can I use any red filter for capturing NIR light? @sujayj about 2 years ago
I would like to know why near infared imaging works, and what it does. @kiramac about 2 years ago
GoPro Hero HD first version- Making full spectrum( Removing IR filter) @suman over 2 years ago
Can you process multiple images at the same time? @JonathanM32 over 2 years ago
PublicLab Mobius calibration @dbehr over 2 years ago
Video Infragram @jfd over 2 years ago
Query about Infragram DIY Filter Pack ( blue & red filter) @suman over 2 years ago
Question infragram kit @marfisistemidroni over 2 years ago
What is the ideal white balance for the Infragam Point and Shoot? @abdul over 2 years ago
Can anyone help me troubleshoot my NDVI imagery? @abdul over 2 years ago
How to process images using a mobius with an IR lens? @miguel_rosas over 2 years ago
MobiusActionCam vs S100 @ashwinvasudevan over 2 years ago
what are the requirements of a camera for Filter replacement and NDVI imaging? @Ajith_Kumar over 2 years ago
loading the proper camera driver for the DSK webcam @Winter over 2 years ago
Correct Config. File & Trobule shooting2 @will123 over 2 years ago
Don't know how to use DIY Plant Analysis Webcam @Barabba33 over 2 years ago
Infragram Point and Shoot Plant Cam @alexrfholland over 2 years ago
Question: Infragram point & shoot image @ino almost 3 years ago
How can one Infragram photo produce different NDVI results? @cfastie over 3 years ago
Question: how to calculate NDVI @rajsan1108 over 3 years ago
What is the correct interpretation for the NDVI infragram color scale? @DuvTorres almost 4 years ago
Modified camera with 25A red filter - NDVI needs calibration- Any Ideas? @Tbtouaki over 4 years ago
First Infragram cam trials - Primeros ensayos con cámaras Infragram @ivalethia over 4 years ago
Question: retrieving true color image from infragram images @brooksdr over 4 years ago
Will Infragram help with Indoor Hydroponics/Aquaponics? @ajawitz over 5 years ago
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Older questions

Note: we are working to move these into the newer Questions system. Please copy them in if you can!

Can this be used as a thermal imager? For example, to find hot and cold spots around my home?

The short answer is that no, it cannot be used as a thermal imager--however, we have been working on a project that does just that:

Is the square of DIY filter large enough to attach to a SLR lens?

Yes, we are sending a 4"x4" square of filter.

Could it be used to help identify pigments or in some case reveal hidden things under drawings or paintings?

We're not sure! Can you link to any examples of this sort of use? If we know the desired wavelengths, we could better answer the question.

What's the infrared wavelength you are using? Do you plan to add far infrared filters in the 750. 850 and 950 infrared spectrum?

The bands are quite wide - you can see the actual spectrum of one of the test filters in this post:

Because of the interest in photosynthesis, we're not targeting a narrow band, but maximizing infrared sensitivity with a broad band filter.

What is the sensitivity of the CMOS sensor you are using, how many lumins?

We're not sure about this, in part because we haven't made a final camera selection. We'll post the specs we have on the webcam version soon, though it is a consumer-grade webcam and may not offer raw image capture.

Is it possible to stack filters with your camera?

See above -- we haven't made a final camera choice yet, but since we'll be selecting a very inexpensive one, the likelihood is not high that we'll have a standard filter screw. We are looking at some standard lens mounts which could help, however... more soon.

When I take a plant photograph, where is the information to help me analyzing or interpreting the color of a photo regarding the plant health?

You can start by looking at the breadth of research by Public Lab members here: and We'll be collaboratively building out that documentation (Wikipedia-style) as we go.

Is the web cam level capable of doing infra red out of the box? Meaning if I take it, plug it into my laptop or what have you, I will be able to go out in my backyard and take shots with it infrared style?

If you remove the filter and add your own infrared pass (visible block) filter you'll be able to take infrared photos, yes. We have some documentation on the website to guide you on that too:

Can you put the filters on a pair of glasses, and use them without needing a camera?

No, because your eyes cannot see near-infrared. A CCD or CMOS camera can, but only after we remove the infrared-blocking filter.

Which cameras can be converted with an Infragram filter?

We're creating a list here:

I was wondering if it is possible to get more than one [anything]?

Kickstarter rules state "only one reward per pledge." If you would like to get more than one kit, this will require making additional pledges. After we have completed and fulfilled this campaign, and have the product in our store, you will be able to buy multiple kits there. Specifically for the filter kit however, please note that the 4"x4" piece of superblue is big enough to convert multiple cameras.

I would prefer to incorporate the camera into a watering system, i.e. take picture, evaluate plant, water if necessary. Do you have any plans to move in this direction?

Yes! we are developing Infragram processing software for the Raspberry Pi. With some programming and a Raspberry Pi or other Arm Linux board, you could totally incorporate the camera.

Can this be used with a smartphone camera, such as iPhone or Galaxy S III?

We would love to have this functionality on cell phone cameras, but you would have to permanently modify your cell phone to capture near infrared. We can't confirm that the infrared filter is removable on any particular phone.

looks like an awesome project! How much more work for a camera that can do Ultra Violet?

Inexpensive digital cameras like the one's we've been building our platform around are typically sensitive down to 350 nm, depending on the particular brand; some back-illuminated CMOS sensors can register as low as around 200nm. To see more discussion on this, check out our wiki, here:

The "click and go" edition, is that coming with Sdcard slot?

Most likely, yes -- most of the point and shoot models we've been looking at using have a micro SD card slot, useful for storing and transferring images.

What is different about your filter to available Infrared filters that can mount on DSL lens or modified existing filter to a Infrared filter?

We've been honing in on the particular filter we're going to use via this dicussion, here: -- it's likely going to be a "SuperBlue" filter; and there may already be DSL-mountable filters with these particular block- and pass- properites, but we're planning on simply using a 4 in x 4 in square of the material and modifying the camera in a DIY fashion.

Can I get the software that runs on my own computer?

Yes, there is a free ImageJ-based plugin developed by Ned Horning available here.

What exact range of wavelength you are covering? Up to 1000nm, 1200nm or even more?

The sensitivity of most inexpensive, consumer digital cameras (the sorts we're targeting in this project) seems to drop off pretty sharply beyond 800nm, or so (a limit which works well for generating NDVI imagery associated with plant health). A typical spectrum associated with a Canon Elph (which is likely close to the sensitivity of the point-and-shoot we'll be using) is here:

Can the point-and-shoot model take only infra-red pictures? Or can it take normal ones also?

The point-and-shoot camera will be modified so that it will be capturing infrared light, which will affect the "red channel" of the images you'll capture. So, the usual RGB pictures you'd expect will look different, and won't be "normal". That said, infrared photography is quite beautiful in its own right, and something that many photographers are interested in -- check out the images captured with a similarly-modified camera, here:

**@kate guberg -- great to hear! A Raspberry Pi and an EEE PC should both work well with the webcam option.

If the camera is setup with the proper filters for Near IR, then what is the online processing for? Why is the image right off the camera not useful directly?

In order to generate information about plant health, the incoming RGB data needs to be processed in a particular way in software (actually quite straightforward, and similar manipulations can be done manually, in Photoshop -- we're just looking to provide an easy, one-step, online process). For more info about the processing required, check here:

Is there a picture or mock-up of what the final camera will look like for the Infragram webcam option? is it just a retail webcam with a filter swap?

We haven't yet settled on the particular webcam, so no mockup as yet, but yes: it'll likely just be an inexpensive retail webcam, with a filter swap.

How does shade affect this kind of photography?

The values of NDVI can be different in shady areas compared to sunny areas for two reasons: 1) The color of light illuminating shady areas is different from that illuminating sunny areas. NDVI is based on the difference between colors, so that could cause NDVI results for shade and sun to differ. 2) The amount of each color recorded by the camera depends in part on exposure. If shady areas are dark in the photos (underexposed), the values for some or all colors will be very low. The computed values for NDVI will be more sensitive to random or other variation when two very small values are compared than when two larger values are compared.

NDVI values in shady parts of aerial images are discussed in these notes:

I heard that infrared filters can be used on cameras without removing the factory infrared block filter. It just requires much longer shutter speeds. Is that true of the Kickstarter infrablue filter?

That probably won't work with the Kickstarter filter. The infrablue filter passes near infrared, but also blue and green light. So keeping the shutter open long enough to adequately expose the red channel with infrared light will overexpose the blue and green channels and the photo will not be useful. In general, an Infragram camera must have it's IR block filter removed so there is more or less equal sensitivity to infrared and blue and green light.

[yet unanswered...]

For the $10 pledge, instead of the blue filter paper, could I get one of the used IR blocking filters that you are removing from camaras? If they are a flat plate, not a coating on a lens.

Do you all have any experience using EigenCam software?

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