I was a bit intrigued by the question of what this actually looks like
printed. So I printed the GE sign crop section at various sizes that,
for the whole 4000x4000 pixel image would be the equivalent of
16.7x16.7" down to as small as 6.7x6.7". The largest image looks OK at
large print viewing distances but grain is clearly visible from about
18-20". At 10x10" size a photographer at reading distance will
recognize the grain in some areas but a casual observer might not
notice. By the time the print is down to 6.7x6.7" the grain has
vanished (at least for my reading glass aided eyesight)
Of course noise reduction software might do a much better job than
simply resizing the image here but I was surprised at how long the grain
persisted in even modest enlargements from a 6x6cm frame.
Chuck Norcutt
ws wrote:
> Interesting. The 25% resize function will low pass filter the data, implying
> the small grain structure is higher in frequency.
>
> Wayne
>
> At 01:11 PM 3/15/2009, you wrote:
>> I just tried it again but actually resized the image. At 25% the grain
>> appears to be gone. Re-enlarging back to original size shows some
>> weakened grain is still there but you just can't see it at the smaller size.
>>
>> Chuck Norcutt
>
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