Spring 2012

Spring 2012
by ani

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Just take your own measurements You don't really need complete response curves, just single data points for the leds you use. Compare photos of your leds set to multiple power levels. Shoot in manual mode, in case your camera does some tricks and effects to "improve" the result. If using JPEG, apply reverse gamma function to obtain linear intensity values....


There isn't any such thing unless you have a camera which outputs RAW images. For all cameras the internal preprocessing (which generates the JPGs) applies responsivity corrections before you ever see the data. I doubt you'll find a camera in that cost range which has RAW output. Now, as a Systems Engineer and Analyst, I always ask: What is the problem ...

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