Darren New wrote:
> Warp wrote:
>> which I could instantly recognize even today.
> 
> That's hardcore. :-)

That's nothing.

I saved specially designed images to tape to try to reverse-engineer the 
algorithm for turning colours into tones. I figured out that if you save 
in image composed of horizontal bands of colour, the tape contained a 
series of long, continuous tones, and they changed order depending on 
which colours you used.

(Recall that the Spectrum stores scanlines in a weird order though...)

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