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Question:Question: retrieving true color image from infragram images

brooksdr is asking a question about infragram: Subscribe to answer questions on this topic

brooksdr asked on September 12, 2014 18:09
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Just as an interesting exercise, is it possible to process, say a .bmp version of an infragram image, in such a way as to retrieve a true-color image? I suggest .bmp because of the very simple 3 (RGB) bytes per pixel file format which makes it easy to modify these values. What do these bytes represent in the near-IR image? Is there an algorithm to edit them "back" to a true color image? Or is there no relationship which will work repeatably for different kinds of scenes?



question:infragram



3 Comments

cfastie about 3 years ago

An infragram photo file does not contain enough information to produce a normal color image of the scene. The infragram filter blocks most of the blue or red light, so information about that color is mostly missing (that color channel is used to capture information about near infrared light). Without the missing color channel, a normal color image cannot be made.

brooksdr about 3 years ago

OK. Thanks. Maybe I should already know this, but does the infragram point-and-shoot camera use the red channel or the blue channel to capture information about near-IR light?

cfastie about 3 years ago

The infragram Mobius camera uses a red filter (Rosco #19) which blocks most blue light and therefore captures mostly NIR light in the blue channel.

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