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A tool for burning visible pictures on a compact disc surface (2022)

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Re: A tool for burning visible pictures on a compact disc surface (2022)

#32

Post by _def »

isoprophlex wrote: post #24
HPsquared wrote: post #17

I suppose these shapes could be made incredibly detailed . There must be some kind of application for that.

Its basically a bespoke diffraction grating printer, indeed. So, you could probably print holographic images?

This github issue mentions a paper about holographic images on a DVD: https://github.com/arduinocelentano/cdimage/issues/14

But I can't actually imagine what it would look like. Sounds amazing though!

Re: A tool for burning visible pictures on a compact disc surface (2022)

#34

Post by londons_explore »

Congrats to the author - a few decades ago I attempted the same, with very little success (using data tracks, not audio, which might have been my mistake).

The challenge (as I saw it) was that the drive has the option to toggle the state of the laser every sector, effectively letting it invert all your data if it wants to. To have control of the laser state, you need to be able to do perfect predictions if the drive will toggle or not.

Any unpredicted bit leads to the laser state toggling and the image being ruined.

Re: A tool for burning visible pictures on a compact disc surface (2022)

#35

Post by lucianbr »

londons_explore wrote: post #34

Congrats to the author - a few decades ago I attempted the same, with very little success (using data tracks, not audio, which might have been my mistake). The challenge (as I saw it) was that the drive has the option to toggle the state of the laser every sector, effectively letting it invert all your data if it wants to. To have control of the laser state, you need to be able to do perfect predictions if the drive…

Assuming control of the decision to toggle, could that be used to draw something even while burning useful data? Of course you would have very low precision, but still. Maybe an outline or something.

Re: A tool for burning visible pictures on a compact disc surface (2022)

#37

Post by 4rt »

m-s-y wrote: post #20
Cockbrand wrote: post #12

Back in the day, there was a Yamaha burner with a feature called "DiscT@2". It could burn images and text onto the unused area of a CD-ROM. I just had to get it and did so, and I had a bit of fun with it.

Same. I had one of these in ‘98/‘99. The disc didn’t even go into a standard tray—-you had to use a caddy that completely enveloped the disc.

any idea what the caddy did?

some sort of feedback for rotation angle maybe?

Re: A tool for burning visible pictures on a compact disc surface (2022)

#39

Post by jonah-archive »

xattt wrote: post #19
Cockbrand wrote: post #12

Back in the day, there was a Yamaha burner with a feature called "DiscT@2". It could burn images and text onto the unused area of a CD-ROM. I just had to get it and did so, and I had a bit of fun with it.

It seemed especially badass when the model number was the CRW-F1, released in 2002. It was also cool because the activity would blink purple (orange + blue) during writing. This set it apart when blue LEDs were all the rage.

I still have mine (in a firewire enclosure)! Last tested the DiscT@2 feature about four years ago, at the time qpxtool had a utility for burning the imagery under Linux.
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