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I think the claim that this will affect scientific data is a little alarmist. Most of the data I work with comes from a CCD, which Im almost certain has a linea
by rflrob 16y ago
I think the claim that this will affect scientific data is a little alarmist. Most of the data I work with comes from a CCD, which Im almost certain has a linear scale between input brightness and pixel value. But more importantly, I wouldn't ever scale my images down, except possibly for publication, and by that point, I've usually tweaked the brightness and contrast anyways.
- jacquesm 16y ago> Most of the data I work with comes from a CCD, which Im almost certain has a linear scale between input brightness and pixel value. CCDs are definitely less than ideal as a sensor, unless you've calibrated the specific unit you are using and apply a correction curve you can definitely expect some non-linearity. Some professional grade CCDs apply a correction internally before passing the data to the consumer. Sources of non-linearity are blooming (the leakage of current from brightly lit cells to dark cells nearby), AD non-linearity and temperature effects. I'm assuming you are talking about a professional grade CCD with an internal correction, but the blooming issues are part and parcel of the medium and when you have high contrast images as input you really have to be aware of that.