3 ms·
Why were 5 different exposures needed?
by shrx 4y ago
Why were 5 different exposures needed?
- watmough 4y agoMy reading of the diagram says that 5 different exposures were needed to establish a 5+1 level gray scale. Note that each picture is scanned simultaneously, and contributes to whether 0 - 5 holes are made in the tape. At the receiving end, the number of holes controls the brightness of the beam reconstructing the image.
- shrx 4y agoThis makes sense, but I guess you could still achieve the same effect with only one exposure + a configurable readout offset with a variable resistor or something along these lines?
- RC_ITR 4y agoI think the tape just had 5 channels and each channel related to one level of grayscale. If the tape had more or less channels, there would be more/less exposures.