Calibrating MacBook Pro w/ i1 Pro. Which LED display technology is it?

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Calibrating MacBook Pro w/ i1 Pro. Which LED display technology is it?

Hi all, I'm trying to calibrate for photography my MacBook Pro 6,2 with a high-res matt screen using the i1 Display Pro calibrator.

The i1 software is asking me whether the technology used is CCFL (Cold-Cathode Fluorescent), Wide-Gamut CCFL, White LED or RGB LED.

From other threads, I'm pretty sure it's LED backlighting technology as the screen lights up immediately at start-up, unlike CCFL which apparently starts dimmer before brightening. So I've calibrated it twice entering once 'RGB LED' and once 'White LED' to see the difference. The 'RGB LED' calibration makes the greys look slightly cyan, and the 'White LED' makes the greys look pretty neutral, if not slightly red, but I'm still unsure which technology is used.

It would be very helpful is someone knew the answer and could help me out. Many thanks!!

MacBook Pro, Mac OS X (10.6.8), High-res matt screen

Posted on Jan 7, 2012 3:41 PM

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Answer 1

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Frank Caggiano

Level 7

25,899 points

Jan 7, 2012 6:57 PM in response to guillaume514

Open a terminal window and enter the following:

ioreg -lw0 | grep IODisplayEDID | sed "/[^<]*</s///" | xxd -p -r | strings -6

So on my 21.5 inch iMac I get this:

Pandora:~ frank$ ioreg -lw0 | grep IODisplayEDID | sed "/[^<]*</s///" | xxd -p -r | strings -6

LM215WF3-SLA1

Color LCD

Pandora:~ frank$

Google the model number and you'll get the manufacturers data sheet (as well as tons of other info). For this iMac part of the spec sheet is:

regards

Message was edited by: Frank Caggiano - So you can see the Lamp Type: WLED white LED

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Answer 2

Jan 7, 2012 7:27 PM in response to Frank Caggiano

Just a note: The text entered in the terminal should be all on one line.

ie:

ioreg -lw0 | grep IODisplayEDID | sed "/[^<]*</s///" | xxd -p -r | strings -6

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Answer 3

Jan 7, 2012 8:20 PM in response to Frank Caggiano

Cool ➕.

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Answer 4

guillaume514 Author

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Jan 8, 2012 3:19 PM in response to guillaume514

Thanks Frank! You're amazing!

I had never heard of Terminal, but it worked! My display is LTN154MT07, which is a Samsung. I haven't found the data sheet in Google, but this website www.anandtech.com says that this model is a White LED, not an RGB (which apparently are better).

I also saw it's possible to find the display info this by doing this:

1. System Preferences > Displays > Color > Color LCD > Open Profile > Line 17 (under "Model")

Thanks so much for your help!!

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Answer 5

MacKyver

Level 1

11 points

Jun 16, 2012 4:01 AM in response to guillaume514

There's a second question by the thread starter on whether the display is RGB or White LED.

I'm dealing with the exact same dilemma right now, not knowing which one to use for my i1display Pro.

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Answer 6

Jun 16, 2012 6:25 AM in response to MacKyver

The lamp type in my example is listed as wled, whilte LED.

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Answer 7

léonie

Level 10

194,629 points

Jun 16, 2012 6:31 AM in response to Frank Caggiano

Pandora:~ frank$ ioreg -lw0 | grep IODisplayEDID | sed "/[^<]*</s///" | xxd -p -r | strings -6

😎 You made my day, Frank! All my favorite unix tools beautifully combined in one single pipe! The "/s///"-part of the command I actually had to look up in the manual 😀

But why did you call your poor iMac "Pandora"? What kind of evil is contained therein? 😮 Don't let it escape and spread all over the earth! 😀

Cheers

Léonie

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