Precision M6400 screen color as blue push/tint

Dreamer have you seen any of the RGBLED screens with the problem mentioned in this thread? Are you aware of any reviews of the M6400s RGBLED like the ones you cited for the W700?
Tnx!

 

Would you happen to have any information like this for the CCFL panels of the HP 8730w, especially the WSXGA+ one?

I'm strongly leaning towards selling my M6400 and getting an 8730w instead.

 

Mavtech, according to 8730w manual, it said :
(17.0-inch, WSXGA+WVA CCFL display)
Contrast ratio 200:1 (typical)
Brightness 180 nits (typical)
Viewing angle +/-60° horizontal, +40/-50° vertical (typical)

I believe it's a 1 lamp screen as the WXGA CCFL (same specifications), so it won't match my graphic requirement for a laptop.
That Dreamcolor option is so so so expensive I will have to go back to M6400 if I want a led screen that match my needs.

Well, I just can't decided which of those laptop I'm going to buy, I'm not satisfy by either : need the led screen price of the M6400 and the 8730w build strengh. I've been waitting few months now to make up my mind, maybe I should wait untill september for next generation

 

I don't know about any review at the moment, you will have to wait for that I guess.

As to the problems, I haven't been much around lately, so I haven't followed the discussions either, look at the owner's threads.

The only thing that is common in all Dell, HP and Sony sections is that people run into the typical wide gamut issues since most applications aren't color-managed, but that's not new anyway.
http://forums.overclockers.com.au/showthread.php?t=723315

The WSXGA+ matte screens on the HP is just the typical notebook screen, it should be about 200 nits brightness, 1xCCFL, 45% NTSC color gamut and is usually LG (at least based on what we've seen around), but it isn't very popular here since most people opt for the WUXGA and you will hardly find even reviews for it.

Still, there are a few people with such screens around:
http://forum.notebookreview.com/showthread.php?t=291716&page=3

 

Dreamer tnx, again for the valuable info.

I did a bit of searching and I realised that no matter the fixes someone may try if there is no correction at the base (the OS) all the solutions are partial and I would guess not satisfying.

So no good news?
Well there are good news but all the ppl who have this problem (me too potentialy, given the laptop I will get this week and that you can see in the sig) must wait a bit. The solution seems to be Windows 7!
Take a look at these two links.
http://news.softpedia.com/news/Windows-7-High-Color-Support-98741.shtml
and
http://en.wikipedia.org/wiki/Features_new_to_Windows_7#New_color_depths.2Fgamuts
scroll down to: New color depths/gamuts

I am a complete ignorant of the small details but I guessed that this means that Windows 7 will correctly show the colours.
Doing a bit more searching I found these post (which redirect to the first two )
http://photography-on-the.net/forum/showthread.php?t=633562
http://forums.dpreview.com/forums/read.asp?forum=1004&message=30175017
(Both these two come from photographer's forums)

What do you make from all of these? I am too tempted to say that Windows 7 will solve the problem, am I too optimistic?

On the other hand can any of the ppl with the colour problem install Win7 and tell us if Win7 can show them correctly?

 

Hi,

Dreamser, thanks for information on displays!
Really interesting reading.

After reading the overclockers posts fr wide gammut I checked the profile of my LED on the m6400 and compared it to 3 external displays and 3 laptops calibrated with Spyder 3 Elite.
Dispaly 1 - 20'' Apple cinema - have tendency to display reddish after calibration
Display 2 - 24'' samsung 245BW - Greenish after calibration
Display 3 - older 20'' intel iMac - in between samsung and cinema display

laptop 1 - XPS M1710 - could not notice any unplesant tint after calibration - extremely close to imac
laptop 2 - macbook pro 15' intel older model - just a a little on grene side
laptop 3 - IBM t43 1400x1050 LCD - bege tint

Eye adopts to the color in 15-20 seconds and the only way to see the difference is actually to have all devices all side-by side at the same time.

Looks like spyder 3 elite cannot completely eliminate color tints even on CCFLs. In some cases it actually adds it - My cinema display have much less red tint when caliration profile is not applied, comparing to after calibration profile applied.

Comparing all these displays together I realized that my previous exaple profiles posted here are too much on the red side as I used as reference my calibrated Cinema display which had a red tint.

So now I think that more correct values for going rom Adobe RGB to sRGB color space are by adjusting the display via nvidia panel gamma curve (XP no gamma curve in vista drivers by default) I always remove center adjustment point and making top with the following :
Color Input Output
RED 1.00 0.98
GREEN 1.00 0.86
BLUE 1.00 0.86

so these gammas on the monitor driver are all straight lines from 0-0 to the values above.

After display driver gamma is done, I set display brightness to between 120 and 130 cd/m^2. And calibrate as native white point with 2.2 gamma.

I will add my ICC calibration rofile later. If you have your own calibrator, you can create icc using native white point and gamma 2.2.

If anone may try this method on another m6400 with RGB LED, please let me know the results. Maybe we can create some average of the multipple samples for R, G, B gamma correcton and common ICC profile, or set of profiles which would allow people to do easy conversion from m6400 LED Abobe RGB to sRGB space for LED.

If anyone know how to calibrate Display to Adobe RGB color space with a spyder (create Adobe RGB color profile) would be nice to know how it is done.

Thanks.

Thanks.

 

Profile

had to reduce over-saturated reds a little. Colors are still a little more vivid than should be but in reasonable range.

Gamma correction on nvidia driver - straight lines, no central point. All start on 0,0 enda on 1.00 and the foolowing for output:

R: 0.95
G: 0.85
B: 0.85

Laptop-LED-Gamma-095-085-085.icm attached.

This is for LGD018E - RGB LED MATT 17'' 1920x1200 on M6400 FX3700m and brightness 125cd/m2 measured with by spyder elite

You need a 3rd party program to load the correction on boot if you want all desktop colors to be corrected from OS any non-color managed software.

 

I put some of this info in the 8730w owners thread:
http://forum.notebookreview.com/showpost.php?p=4287131&postcount=34
The panel in the HP8730w DreamColor is the same as the one in the M6400 RGBLED.
In short, this is probably the best display you can find on a laptop at this moment, but it doesn't come close to a desktop EIZO, and that doesn't surprise me at all. After all, you pay at least 1500 EUR for a professional display with an IPS panel and high-end electronics. I wonder how many people would accept an increase of 2000 USD in the price of their laptops only to have a *real* professional display.

Dragos

 

Still confused.. does a 6 bit monitor mean that it can display 2^6 colors for each color (RGB)? So would a 6 bit monitor be the same as having 18 bits of color? If I were to change the display settings of an external monitor capable of doing 16.7 million colors to 16 bits of color under windows, it should be displaying less color than a 6 bit monitor, right?.

The reason I am confused is that after changing my external monitor to display only 16 bits of color, it still shows two shades of yellow for that google map yellow pin where as the 6 bit CCFL shows one. Am I missing something here?

 

alektoro I am not 100% sure here but in my understanding the situation is as following:
With the exception of RGBLED which is a true 8bit screen and can actually produce 16.7M colours all the others are 6bit which means that they should only ne showing 262K colours.

Yet each manufacturer taking advantage to different extent different dithering solutions can increase the number of colours, at least as far as the human eye is concerned. (check this wikipedia link for more info http://en.wikipedia.org/wiki/Dithering)

This is also prooved by the fact that at the list Dreamer posted 6bit screen provide different coverage of the color gamut (% NTSC), the percentage ranging from 45 to 72% usually with one going up to 90%. (http://lcdtech.no-ip.info/en/data/laptop.lcd.panels.htm)

So after all this why your screen shows only one colour? I am guessing that the screen's (and DELL's) dithering solution is not as good as others, resulting in a very low % of the gamut.
On the other hand when you reduce the colours to 16 bit in the external monitor the % of the gamut covered is enough to show 2 colours.

Perhaps others should also comment on it, just in order to be sure.