In 1980, on the 8-bit Apple ][ computers using hex assembler, pixels
were 00 for black and FF for white (otherwise called 0-256 in
base-10 or 00000000-11111111 in base-2 or binary). In today's 32-bit
computers, a white pixel would be 11111111111111111111111111111111 in
base-2 or FFFF in base-16. This is why Flick spoke of number systems
(binary, decimal, roman): because the 0s and 1s represent
representations of images rather than representing images directly.
At 18:06 -0400 30/08/11, Steven Gladstone wrote:
>On 8/30/11 1:28 PM, Flick Harrison wrote:
> > re: POINT 1: ones and zeroes aren't analog representations of "on" and
>> "off." You could more fruitfully say that "on" and "off" are mechanical
>> representations of 1 and 0, since the binary number system stands in the
>> abstract, like the decimal or roman system.
>
>The way I understand it the 1 and the zero come from video and waveform
>monitors, where 0 was black, and 1 was "White" or full exposure. This
>was of course for an analog signal. I know the video scale is measured
>as I.R.E. and the scale is 0 to 100 (or actually 7.5 to 100 in NTSC
>land) but my understanding is that 100 I.R.E. correlated to 1 volt.
>Digital is strictly an ON/OFF voltage states. This can be represented by
>ots and dashes, ones and zeros, but through the wires, it is all on off
>voltage states - the numbers 1 and zero are not being sent through the
>wires.
>
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Received on Tue Aug 30 2011 - 15:15:54 CDT
