Harry Nyquist says resize your damn photos

Jun 19, 2006 09:24

In yet another chapter of " saying it once to avoid repeating myself" I'd like to discuss the concept of Nyquist Frequency or Nyquist Rate as related to posting or emailing photographs.


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photography, nyquist

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Comments 24

ikkyu2 June 19 2006, 16:56:20 UTC
Do you want to see the nails holding the fence together? The individual paint flakes on the fence? The grains of silver in the film you scanned? The noise in the photodetector that scanned the film?

..the individual, limp, bedraggled hairs on the sweaty, matted fur-suit?

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mkb_cbr June 19 2006, 16:57:07 UTC
*grin*

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mkb_cbr June 19 2006, 17:07:17 UTC
The problems I've observed are more fundamental:

1) Many people don't know how to resize an image for distribution.

2) Most non-technical people don't grasp the idea that what they see on their screen is just one of many possible representations of the underlying image. To them what they see is the image. Thus images are sized in screen inches, not in bytes. Thus if they see the image in a window which is 5cm across, then 5cm is the size of the image they sent you-- not the 10MB lurking under the hood ( ... )

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tongodeon June 21 2006, 17:08:59 UTC
I try not to explain concepts this way because although it proves that I'm right it doesn't explain *why* I'm right, and without the *why* I'm just teaching another meaningless mechanical ritual for my student to misapply when the situation changes.

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occlupanid June 19 2006, 17:08:56 UTC

i love that you take your aggressions out in fits of informative data.

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tongodeon June 19 2006, 17:39:41 UTC
I grew up with a mother whose answer to everything was "because I'm the mom and that's what I say", which was profoundly unsatisfying. For this reason I don't like to pretend that my personal opinion is worth anything, which is why I extensively cite everything so that it's clear where my opinion comes from.

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your parents occlupanid June 19 2006, 18:27:40 UTC
I think its funny that you came from your mom saying "because I'm the mom and that's what I say" and then your dad being willing to explain things thoroughly with enthusiasm and clear details. Really different styles. You take after your dad.
Christy

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Re: your parents tongodeon June 19 2006, 18:30:27 UTC
Very true. I can't think of a time when I ever heard Dad say "because that's what I say". Although there were a few times where he said "I don't find your argument persuasive enough to agree".

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haineux June 19 2006, 18:29:20 UTC
I still don't see the frickin' sailboat.

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haineux June 19 2006, 18:42:32 UTC
Also, the reason that one should not master a CD at 44.1 KHz is because making a filter to allow the audio but reject the carrier frequency requires a lot of extra work to do without screwing up the rest of the audio signal ( ... )

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