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Anonymous
sup /p/
how many megapixels equivalent is your average 35mm film frame?
picture not related
>> Anonymous
In before shitstorm.
>> Anonymous
lolwut?
i read that the t-grain in kodak's best slide film were about 1.5 micron (about twice the wavelength of light it is built for), so that + math is the answer
>> Macheath !8b4g0BkNZg
>>74872
1.5 microns in what? Length? Area?
>> Anonymous
It's close to infinity. Yes, really.
>> Anonymous
with a good lens on velvia you're supposed to get about 22mpix resolution.
>> thefamilyman !!rTVzm2BgTOa
Velvia 50/100 has a grain index of 8 also the same as Kodak E100G/GX
>> Anonymous
A grain size of 1.5 micron gives the maximum resolution of 300+ megapixels.
HOWEVER, a single grain can be either exposed or not exposed - i.e. either pure black or pure white for B&W film. So this resolution can be achieved only on black-and-white (not even grayscale) test charts and documents.
For the same reason, a direct comparison between film and digital is not possible - one photosite of a 20 MP full-frame sensor is about 6 microns in size - thus 16 times larger than the finest grain of film - but it can resolve lots of different shades (up to 4000 for 12-bit ADC and 16000 for 14-bit, if we discount noise), not just pure black and pure white.
Also, grain size in film is more or less proportional to its sensitivity. If ISO 50 film resolves 300 megapixels, ISO 1600 film of the same kind will 32 times less - around 10 megapixels, and that's only on a pure black and white test chart, as mentioned earlier.
>> Anonymous
     File :-(, x)
>>74898
To further illustrate this point, here's a picture:
>> Anonymous
>>74898
>>74899

i still dont but the "binary" argument
>> Anonymous
>>74907
lol wut?
>> Anonymous
     File :-(, x)
>>74898

if a grain is either exposed or not exposed, either black or white, how do you get gray? typically gray would be a mix of both black and white so small that the human eye interprits them together, right? so if its the same case for film how does the film know which grains to expose and which to avoid should i take a picture of a gray card and the light is equally distributed throughout?

pic semi-related

Camera-Specific Properties:Image-Specific Properties:Horizontal Resolution72 dpiVertical Resolution72 dpi
>> Anonymous
>>74908

meant "buy" not but
>> Anonymous
>>74910
I think that for B&W film, that depends on the amount of light that hits the pelicule. Max amount of light turns all of the grain into white. Medium amounts will turn around 50% of them into white (which will look gray to our eyes). No light will keep things black.
>> Anonymous
>>74919

so the "black & white film" versus "digital grey scale" is negligible unless you only look at pictures through your microscope? lol
>> Anonymous
>>74919

but how do half turn black and the other half stay white under the same light?
>> Anonymous
>>74922
law of averages maybe? with around half the light needed to expose everything, around half will in fact go over to exposed, while the ~half dont?
>> Anonymous
>>74910
- Film "knows" which grains to expose by the number of photons hitting a specific grain. If there are enough photons (=energy) for a chemical reaction to begin, the grain is exposed, otherwise it's not.
- The grains in film are not laid out in a perfect orthogonal pattern - they have varying sizes and shapes, they overlap, etc. so individual grains are harder to distinguish than pixels in>>74899.
- You never look at film directly - printing and scanning processes invariably result in reduction of resolution which considerably softens or even eliminates the "binary" effect (to distinguish individual 1.5 micron grains, you'll have to scan the image at 20000+ dpi or print it on a ten-foot-wide sheet of paper using some super high resolution equipment)
>> Anonymous
>>74924
Not a law of averages, brighter colors result from reflecting more photons.

http://en.wikipedia.org/wiki/Photon

PHYSICS, BITCHES. It's funny that they invented photographic film way before they understood the innards of the process. :D