Omnimaga

General Discussion => Technology and Development => Other => Topic started by: DJ Omnimaga on September 25, 2012, 10:13:49 pm

Title: Scanning cellphone screen gives grayscale result
Post by: DJ Omnimaga 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
Title: Re: Scanning cellphone screen gives grayscale result
Post by: Juju on September 25, 2012, 11:27:20 pm: Wow that's pretty strange actually. Nice find here.
Title: Re: Scanning cellphone screen gives grayscale result
Post by: Hayleia on September 26, 2012, 01:09:54 am: That happened with persalteas too when he scanned his CX CAS
(https://fbcdn-sphotos-e-a.akamaihd.net/hphotos-ak-ash3/533644_367285513351844_2104015851_n.jpg)
Title: Re: Scanning cellphone screen gives grayscale result
Post by: 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.
Title: Re: Scanning cellphone screen gives grayscale result
Post by: DJ Omnimaga 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?
Title: Re: Scanning cellphone screen gives grayscale result
Post by: Juju 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.
Title: Re: Scanning cellphone screen gives grayscale result
Post by: AaroneusTheGreat 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.
Title: Re: Scanning cellphone screen gives grayscale result
Post by: Juju 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?
Title: Re: Scanning cellphone screen gives grayscale result
Post by: AaroneusTheGreat on September 26, 2012, 01:28:44 am: Those are polarizing lenses!
Title: Re: Scanning cellphone screen gives grayscale result
Post by: DJ Omnimaga 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
Title: Re: Scanning cellphone screen gives grayscale result
Post by: Darl181 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...
Title: Re: Scanning cellphone screen gives grayscale result
Post by: DJ Omnimaga on September 26, 2012, 03:23:00 am: Holy crap that's epic. I wonder if I still have my theater 3D glasses somewhere...
Title: Re: Scanning cellphone screen gives grayscale result
Post by: Darl181 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
Title: Re: Scanning cellphone screen gives grayscale result
Post by: DJ Omnimaga on September 26, 2012, 03:29:13 am: How do we open them? ???
Title: Re: Scanning cellphone screen gives grayscale result
Post by: Darl181 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
Title: Re: Scanning cellphone screen gives grayscale result
Post by: DJ Omnimaga on September 26, 2012, 04:03:11 am: Darn that looks quite cool. O.O
Title: Re: Scanning cellphone screen gives grayscale result
Post by: Adriweb on September 26, 2012, 05:27:55 am: Yeah I also thought when I first encountered that, that the polarization could be the cause :P
Title: Re: Scanning cellphone screen gives grayscale result
Post by: ElementCoder on September 27, 2012, 10:50:43 am: Wow that looks like some trippy math there :P Let's see where my 3D goggles are....