Doctor doctor, I'm a photograph that needs processing to see (8)

I believe the answer is:

microdot

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'a photograph that needs processing to see' is the definition.
'microdot' can be an answer for 'a photograph' (microdot is a kind of photograph). I am not sure about the rest of the definition.

'doctor doctor i'm' is the wordplay.
'doctor' indicates anagramming the letters.
'doctor'+'im'='doctorim'
'doctorim' anagrammed gives 'MICRODOT'.

Can you help me to learn more?

(Other definitions for microdot that I've seen before include "Tiny photograph" , "LSD tablet" , "Much reduced photographic image used in espionage" , "very tiny shot" , "photo for spy" .)

I've seen this clue in The Independent.

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