On Friday, 25 September 2015 14:36:09 UTC+1, NY wrote:
"whisky-dave" wrote in message
...
So what is the advantage of RAW, and what is the equivalent in film.
It is very approximately the equivalent to going back to the negative and
printing it at a different exposure or with different colour-correction
filters so you map a different part of the wide exposure latitude of the
negative onto the more restricted latitude of the print. Many automatic
printmaking shops have their machine set to clip the brightest 5% of the
print (the darkest part of the neg) to white and the darkest 5% to black
(thus losing detail at those two extremes) because this produces more
contrasty, less muddy prints.
But yuo don;t do that sort of thing with film.
There's no such thing as RAW in the film world.
The only reason people use RAW is because the digital jpegs aren't good enough for what they want to do with them, so what does that say about digital.
For digital, some cameras are set to do the same sort of thing when going
from the sensor image to the JPG, as well as to apply some sharpening and
JPG compression, whereas AFAIK the raw file is not lossy compressed, is not
sharpened and often doesn't have any white balance correction; you are left
to do all those things to your own preference using proprietary RAW -
JPG/TIFF/PNG software that comes with the camera or with packages such as
Photoshop which can read various cameras' RAW formats. Some cameras' RAW
files actually have the suffix DNG (digital negative) because that is
effectively what the file is - what the sensor saw before any in-camera
corrections.
so it's the equivalnet of film in that you get everything rather than a cut down amount of data that you get with jpeg. Sure it might be good enough.
try expaining why you'd use jpeg to someone that has only used film.
Why do yuo want a lower quaility image i.e a jpeg when yuo can have maxium quality
a 1/3rd of a stop surely with digital this should be expressed as 0.33333
of a stop and what is a stop in digital terms ;-)
As with film photography,
NO, I said explain what a stop is in digital remmeber you haven't a film canera yuo are teaching with a digital camera.
So what is a stop and what does it mean.
Why call it a stop one have such strange stop numbers.......
why does f5.6 let in twice that of f8
1 stop is a halving/doubling of the amount of
light getting through the lens (eg f 5.6 - f8) or a halving/doubling of the
shutter speed. Maybe 1/3 stop should be expressed as 0.33 recurring, as you
say :-)
with shutter speeds even digital camera, you select 1/125 or 1/250
why not have the dial set to 187ms exposure ?
Why does the image on my LCD look the same irrespected of the aperature and shutter speed I set.