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Author Topic: Scanning cellphone screen gives grayscale result  (Read 8874 times)

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Offline DJ Omnimaga

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Scanning cellphone screen gives grayscale result
« on: September 25, 2012, 10:13:49 pm »
I noticed something strange when using my HP scanner. I'm not sure if it's something common with all LCDs but I couldn't find anything about it on Google. I was experimenting a bit and decided to try to scan my mobile phone while it's turned ON. For odd reasons, in the scanned pic, the mobile device LCD was grayscale. I tried at various brightness levels: same result.

Can anyone explain this phenomenon? O.O
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Offline Juju

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Re: Scanning cellphone screen gives grayscale result
« Reply #1 on: September 25, 2012, 11:27:20 pm »
Wow that's pretty strange actually. Nice find here.
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Offline Hayleia

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Re: Scanning cellphone screen gives grayscale result
« Reply #2 on: September 26, 2012, 01:09:54 am »
That happened with persalteas too when he scanned his CX CAS
« Last Edit: September 26, 2012, 01:10:10 am by Hayleia »
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Offline AaroneusTheGreat

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Re: Scanning cellphone screen gives grayscale result
« Reply #3 on: September 26, 2012, 01:12:26 am »
It might have to do with the fact that the light exiting the screen is polarized.

[EDIT] I just noticed the scanlines in the images too, I think the polarization idea is making more sense now.
« Last Edit: September 26, 2012, 01:13:20 am by AaroneusTheGreat »
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Offline DJ Omnimaga

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Re: Scanning cellphone screen gives grayscale result
« Reply #4 on: September 26, 2012, 01:12:42 am »
Is his screen inverted due to a custom theme or did scanning it really turn it like that?
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Offline Juju

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Re: Scanning cellphone screen gives grayscale result
« Reply #5 on: September 26, 2012, 01:17:31 am »
Quote from: AaroneusTheGreat on September 26, 2012, 01:12:26 am
It might have to do with the fact that the light exiting the screen is polarized.

[EDIT] I just noticed the scanlines in the images too, I think the polarization idea is making more sense now.
Yeah, that totally makes sense.
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Offline AaroneusTheGreat

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Re: Scanning cellphone screen gives grayscale result
« Reply #6 on: September 26, 2012, 01:20:42 am »
If you have access to one, a polarizing filter for a camera may give you the same result in real time by looking through the filter and rotating it to find the point where the colors change.
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Re: Scanning cellphone screen gives grayscale result
« Reply #7 on: September 26, 2012, 01:27:57 am »
Reminds me, I have those RealD glasses they give you at 3D movies, when I put them in front of my computer screen, horizontally the glasses are yellow, but vertically they're blue. It's related?
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Offline AaroneusTheGreat

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Re: Scanning cellphone screen gives grayscale result
« Reply #8 on: September 26, 2012, 01:28:44 am »
Those are polarizing lenses!
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Offline DJ Omnimaga

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Re: Scanning cellphone screen gives grayscale result
« Reply #9 on: September 26, 2012, 01:48:14 am »
I don't know much about that stuff. I guess I would need to check Google XD
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Offline Darl181

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Re: Scanning cellphone screen gives grayscale result
« Reply #10 on: September 26, 2012, 03:06:20 am »
I'm looking at the CX wearing a pair of those..if you hold it at the right angle you get a bunch of rainbow concentric circles O.O
And the prizm's like some weird plasma effect...
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Offline DJ Omnimaga

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Re: Scanning cellphone screen gives grayscale result
« Reply #11 on: September 26, 2012, 03:23:00 am »
Holy crap that's epic. I wonder if I still have my theater 3D glasses somewhere...
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Offline Darl181

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Re: Scanning cellphone screen gives grayscale result
« Reply #12 on: September 26, 2012, 03:26:09 am »
Put the glasses over the laptop webcam :D
(disclaimer: I suck at this)
(also idk how to save/convert it to a different format)

Edit: http://darl181.webuda.com/other/2012-09-26-001816.jpg

Edit2: avis
« Last Edit: September 26, 2012, 03:36:14 am by Darl181 »
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Offline DJ Omnimaga

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Re: Scanning cellphone screen gives grayscale result
« Reply #13 on: September 26, 2012, 03:29:13 am »
How do we open them? ???
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Offline Darl181

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Re: Scanning cellphone screen gives grayscale result
« Reply #14 on: September 26, 2012, 03:30:24 am »
Umm idk tbh :P See if I can find a way to convert them..
Linux knows how to open them tho

Edit: found a converter, avis attached above
« Last Edit: September 26, 2012, 03:42:11 am by Darl181 »
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