Aching Brain

5 Responses to “Scanner photography”

1. Pete Says:
   January 19th, 2006 at 10:27 am

   Very cool stuff, I love what it does to the cars!

   Excellent to see something new.

   [img]http://www.scannerphotography.com/photographyGallery/early/images/4.jpg[/img]

   why is there only colour in the monitor?

   : P

2. Pete Says:
   January 19th, 2006 at 11:12 am

   http://www.scannerphotography.com/cameras/distortion/index.html

   found the answer at the bottom of the page, although he doesn’t explain it very well - the scanner uses a monochrome single line detector and an LED lamp bar that flashes rapidly red then blue then green for each scan line before moving on to the next scan line.

   So the detector reads three lines per scan line, each actually greyscale, but the software interprets them as one red, one blue and one green because it assumes that they were detected as reflections of the lamp’s light.

   Because his scanner cameras have the lamps disabled, the same light intensity reaches the detector for each of the three scans per line so the composite line image is effectively greyscale.

   When scanning objects that are moving faster than the time it takes the detector to read the three colour images (like the scan on a monitor), each of the three images (red, green, blue) will be different: in the time it would normally take for the lamp to flash its three colours, the image has moved, so the software converts the three outputs from the (greyscale) detector into one line with different red, green and blue sections where the image moved faster, although the colours in the image do not correlate with the actual colours because the detector is greyscale only.

   I’m not absolutely sure I did a better job of explaining it…

   : P

3. Pete Says:
   January 19th, 2006 at 11:13 am

   http://www.scannerphotography.com/cameras/distortion/index.html

   found the answer at the bottom of the page, although he doesn’t explain it very well - the scanner uses a monochrome single line detector and an LED lamp bar that flashes rapidly red then blue then green for each scan line before moving on to the next scan line.

   So the detector reads three lines per scan line, each actually greyscale, but the software interprets them as one red, one blue and one green because it assumes that they were detected as reflections of the lamp’s light.

   Because his scanner cameras have the lamps disabled, the same light intensity reaches the detector for each of the three scans per line so the composite line image is effectively greyscale.

   When scanning objects that are moving faster than the time it takes the detector to read the three colour images (like the scan on a monitor), each of the three images (red, green, blue) will be different: in the time it would normally take for the lamp to flash its three colours, the image has moved, so the software converts the three outputs from the (greyscale) detector into one line with different red, green and blue sections where the image moved faster, although the colours in the image do not correlate with the actual colours because the detector is greyscale only.

   I’m not absolutely sure I did a better job of explaining it…

   : P

4. Pete Says:
   January 19th, 2006 at 11:16 am

   d’oh - that’s what happens when you click on “submit” and get a “this page cannot be displayed”…

   : P

5. Alex Says:
   January 19th, 2006 at 2:58 pm

   No, that’s what happens when you click on “submit” and get a “this page cannot be displayed”, so you refresh it and the browser warns you that the page you are trying to view contains POSTDATA and if you resend the data, any action the form carried out (such as a search or online purchase) will be repeated, do you want to continue, and you continue…