David Williams wrote:David Hessel wrote:I doubt anyone here would agree that a 1 bit file can faithfuly store the dynamic range of these cameras which is what this thread is about.
Well you just made his point for him
Black and white, aka 1bit, covers 100% of any cameras dynamic range, from the blackest black, to the whitest white the camera can record.
You are talking about gamma graduation, or steps in between black and white clip, which requires bit depth.
A one-bit pixel can certainly render the whitest white and the blackest black. However, a better illustration of my point using a one-bit system comes from the fact that one-bit
images can show infinite gradation between the whitest white and the blackest black.
In truth, for over 100 years we have been using one-bit images that show gradation. You can see such images everywhere -- in magazines and newspapers, on posters and billboards, in brochures and flyers, etc. These images are screen printed, and such images are comprised of a matrix of black dots on a white field (let's restrict ourselves to black & white images, for simplicity's sake). So, these images actually are made from only two shades -- or "one-bit."
Of course, screen printing does have an analog component relating to the size of the black dots. However, those various sized black dots can easily be rendered digitally using a digital, one-bit system of significantly higher resolution, in which each screen printed dot is made up of numerous black or white digital pixels.
The next point that usually appears in discussions such as this relates to the notion that a one-bit camera/sensor could not work. However, a one-bit camera/sensor that captures gradation is absolutely possible merely by varying pixel-specific filters/apertures to give adjacent pixels various sensitivities. Varied pixel sensitivities has already been demonstrated by Panavision with the design of their abandoned Dynamax sensor, and varied pixel sensitivity can also be done electronically, similar to Magic Lantern's "dual iso" technique.
Go to a museum gift shop and look at their finest, glossy black & white photography books/magazines. There is a reason why these essentially one-bit images can exhibit such an amazing photographic range of tones. It is because bit depth is just one of two primary factors in color depth (or, in our case, shade depth) -- the other major (and equally important) factor of color depth is
resolution.
I will also repeat my above point, which has absolutely no relation to the rest this post -- bit depth and dynamic range are two independent, unrelated properties (which can be easily demonstrated).
Last edited by Holden MacGroyen on Thu May 07, 2015 12:31 am, edited 1 time in total.