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How does a digital camera emulate various ISO?
Old 04-22-2006, 02:02 AM   #1 (permalink)
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My camera can give me a lot of range of film speeds but unlike film with varying grain size/density the digital sensor does not change the physical size of the photocell sites nor change the number of cells available.

Anyone explain how different ISO settings are handled?
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Re: How does a digital camera emulate various ISO?
Old 04-22-2006, 05:58 AM   #2 (permalink)
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The gain on the sensor is increased making it more light sensitive and thus you are able to achieve different ISO speeds. The photocell size cannot be changed because it is hardware which means that noise will be the same but the frequency at which it occurs does change according to your ISO setting.

I read an article on the net where a photographer had taken pictures of the sky with traditional film at various ISO's and then in photoshop placed that scan over the photo, changed the mode to 'overlay' or something like that in order to emulate the grain of traditional film. I can't find the link to the website but I do have the PDF document that I downloaded from there. If you want it let me know and I'll email it to you.
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