Cables/IPS screens/colorimeters and color reproduction. Can cables effect color?

Alright so i was using my xrite display1 to adjust my second u2412m and i can not get matching colors for the life of me....I also refuse to use the LUT part because last time it totally botched my entire screen and all the colors were jacked. There is another thread on how it jacked Windows in several ways and has me for a couple says trying to undo the damage. So the second screen is still on the yellow side and i can't get the colors to be as white as possible. For whatever reason it is still yellow. I use DP on the accurate screen and VGA on the second. I am still waiting for my HDMI to DVI converter so i used VGA for now since the screen has just been sitting there doing nothing. I got it to be less yellow but it is still yellow. I also tried by eye to match it and got it a hair closer but not perfect.

So my main question is....can a cable effect a screens color? I have used 2 different DP cables and haven't noticed a change in main screen but can colors be different between VGA and DP? I haven't tried switching to DP on the second screen yet but was curious is cable can effect calibration.

Also i have stated the in the other thread how display1 software is garbage compared to the eye1 version and the old xrite version. The new version software is completely nerfed and useless from what i have seen of the other software packs. I also can't afford gruman5 or whatever so i am stuck with this crap software. No clue why xrite has crappier software in their newer version -_- Anyone got an eye1 software and want to sell it or lend it to me ^^

I'll try using the LUT adjustments again after i get converter but i really don't want to beat my face into the wall again with it.


effect or affect? I used affect at first and changed it....was my correction right or was i right the first time? I hate english -_-

 

Try this software (you may need to first uninstall your calibrator's current software):

dispcalGUI
dispcalGUI
Open Source Display Calibration and Characterization powered by Argyll CMS

Profiling Dual Monitors
http://nativedigital.co.uk/site/2011/11/profiling-dual-monitors/
By Rob Griffith on November 4, 2011 in Expert Series
"All the major monitor calibrating and profiling solutions support multiple monitor profiling but you may find that your graphics card or operating system has other ideas... If you want to profile multiple monitors then you need a graphics card with a LUT for each output connection, either that or different graphics cards for each monitor. Also even if the card has more than one LUT you may find that the driver for the card still tries to impose a single LUT or settings to all outputs... Vista and Windows 7 still do not successfully implement separate profiles for dual monitors when using a single graphics card... Windows Vista and 7 instead rely on the graphics card to implement both the LUT and the profile. Some cards do this well, others don't... Ideally, you’d be looking for a laptop with DVI or DisplayPort connections, or use a docking station if one is available and offers better connectivity."

"it would be extremely difficult for most users to calibrate the display’s HDMI input. Analog VGA signals, on the other hand, can vary depending on the source signal’s accuracy and are not recommended for calibration."
http://www.hp.com/united-states/cam...s/displayport-advanced-profiling-solution.pdf

 

Vga definitely give different color, so nothing to worry about. Wait for your adapter to arrive then get back into it.

 

well with the HDMI cable it is still yellow so i will just have to try to use the LUT adjustment again and hope it doesn't botch anything. I think i know how to fix it fairly easily this time. I'll also try the other program as well. Maybe this weekend or thanksgiving break....it amazes me somehow i can actually tell the screen is off....maybe it is just that i know it is off because it is the same images i see on a daily basis so i can tell. I miss being oblivious to these things ^^

BTW i find it amazing the difference between matte and glossy screens....i am still not sure which i like more lol. They both have pros and cons

 

so i did the automatic color adjustments and it is a world of a lot better but the colors are still off. I wonder if the screen has issues? I even did the 461 color pallet one and it is a lot better but still off by a bit. Over the weekend i'll give the free open source one a try but i am wondering if it is common for 2 screens to be so far apart in color. I'll see if i can post a picture and post some data.

Any thoughts on why the colors are so different? It is slightly noticeable but when they are side by side the difference in the two screens are huge.

 

Possible causes:

- The LUT problem mentioned in my previous message.

- Calibrating multiple displays with a colorimeter can produce noticeably different color casts in the displays. Spectrophotometers are more accurate, and fix the problem.

- You may not be using a color-managed application to display images. Try Irfanview, it's free. Install its plug-in package. Turn on color-management within Options. Also note that Windows Explorer and the background screen are NOT color-managed, and therefore do not produce accurate color on calibrated displays.

- Give any display 20-30 minutes to completely warm up before profiling, or before visually assessing its color accuracy. Calibrate both displays under the same ambient light.

- Displays having different color gamuts, brightness, contrast ratios, # of hours of backlight use, and number of bits-per-color-channel, can display images differently even when properly calibrated. That's because all of those characteristics affect the fidelity of the display.

When trying out new software, I first use Acronis True Image to make a backup of the system partition. Takes 2-3 minutes to backup/restore (although that depends heavily on the speed of your storage system). And, unlike restore points, it backs up the whole system. That way, if settings accidentally get munged, or something goes bad with the installation, you can quickly restore the system to its previous state. Users should run Acronis ONLY from its boot CD, and NEVER install/run it from within Windows, and NEVER use it with hybrid disks (disks containing both a hard drive with a small built-in SSD), otherwise such users may become very very sorry.

 

deleted ones that are irrelevant or already done.

1)Well i am using HDMI to DVI and DP for the two screens. Also i have a 7970m so.....i would assume it has multiply LUT. Also i thought IPS monitors like the u2412m have their own internal LUT....i thought i read that somewhere....Oh never mind i rechecked. The u2412m does not have a built in LUT :'(

2) can you elaborate?

3)So if you calibarate the LUT for the graphics card it doesn't calibrate everything? It only affects photo viewers and "select programs"??? So is that why everything looked "normal" but when images were opened in windows photo viewer they were super dark and looked like crap? I remember that was one of the problems i had last time everything looked normal expect photo viewer and a couple other programs. It buggered them up so bad. I remember every photo was super dark and entirely inaccurate when it was "calibrated"....crap i am double checking to see if it did that again.

Yep...it totally jacked photo viewer up again. How is it that when LUT is adjusted it doesn't affect everyhting? Also when LUT is changed the background image is changed a little but not a ton. Whats the point of calibration if only photo view is changed....pretty damn useless if you ask me. Here is an image. I will tell you that I remember taking the picture and the "calibrated" one is not accurate and looks like butt and not even close to real life. The other one does look accurate. Calibration is a joke lol

A comparison of the two images.The left image isn't 100% accurate but it is much closer to real life than the right image rofl. Please explain this to me because that "accurate calibrated" screen doesn't look even remotely close.
https://www.dropbox.com/s/czd3uv16qiol3ok/definitely not accurate.png

4)It is the same display u2412m so they should at least be pretty damn close.

 

RE: Colorimeters vs. Spectrophotometers: Your colorimeter measures the light from your display through the colorimeter's own shade of red, green and blue filters. But it has no direct way of measuring which shades of red, green and blue light the display emits (which depends on the exact backlight components and LCD filter components used by the display). So your colorimeter uses a lookup table of that info for common models of display panels. But that info doesn't reflect unit-to-unit variations from the assembly line, etc., so it's not totally accurate.

A spectrophotometer (aka spectrometer) instead measures light in 10-20 bands or subtle shades of color, as opposed to just the three colors red, green and blue. So it can more accurately tell what shades of red, green and blue your display is emitting, and what brightness is emitted in each of those subtle shades of color. So it produces a more accurate overall calibration.

RE: Color-Managed Applications: In color management, color spaces (e.g., sRGB, AdobeRGB, ProPhoto) form the reference frames in which programs access, manipulate, store, print and display images. So a color-managed program will read an embedded profile within an image, and therefore know what colors the image data represents. A non-color managed program won't know that. And a color-managed program will know how to send data to the display so that the colors will be interpreted correctly by the display.

You can see how all of this unravels for non-color-managed applications, when viewing images on wide-gamut (~100% AdobeRGB) displays. Even if the display is properly calibrated, non-color-managed applications display images with wildly oversaturated neon-like colors. And you see this complaint over and over again from users who buy a new computer having a wide-gamut display, who have no idea what that actually means, and start viewing images in non-color-managed apps like Chrome. You're not seeing this behavior, because your displays aren't wide-gamut, but instead have a smaller gamut that's probably ~100% sRGB. So you instead just see that the colors, brightness or gamma are off. Note that most programs for photo work or professional graphics are color-managed, as well as Firefox, plus I think the latest version of Internet Explorer. So people who need accurate color have access to color-managed programs, and the fact that Windows Explorer and programs like Chrome aren't color-managed becomes irrelevant.

So if you're going to do photography or whatnot, and want your pictures to print and display accurately, you need to do some reading about what color management is and how it works. You'll need to deal with color spaces in programs like Photoshop/Lightroom, deal with and store embedded profiles in images, do soft-proofing using the color profile for your printer's ink/paper, etc. I've appended links at the end of this message to a bunch of relevant articles.

I've got deadlines and a lot of work to do, so I'll probably disappear for awhile, but good luck! Your best bet may be dispcalGUI. And you'll have access to dispcalGUI's programmer and user community within the program's forums. So try that and be sure to return to this thread and let us know how everything turned out!

Useful Articles:
- A Color Managed Raw Workflow--From Camera to Final Print
- Graphic card dual lookups for spyder calibration
- Color calibration and dual monitor setup in Windows 7
- Stop Losing Display Calibration with Windows 7
- Intel’s Video Drivers Kill Display Calibration
- Color management of external display is broken?
- Color Managed Workflow with Microsoft Windows
- Questions before I calibrate my monitor
- Why Are My Prints Too Dark?
- ColorMunki Display calibration

 

interesting i appreciate the help but i am still lost on how a "color accurate" calibrated display shows photos that are way to dark and the colors are completely off. I can take a photo and load it on my computer and it is a 100x more accurate without the LUT being calibrated....if i calibrate the LUT the pictures are super dark and the colors are completely off so i still don't get how the colorimeter is making anything accurate.

 

The current gen colorimeter is not necessary less accurate than a spectro
Monitor calibration sensor evaluations

Windows image viewer is color managed if setting is right.

If you are just trying to match the 2 u2412hm you have, try the dispcalgui . Not sure which display 1 you have, but it should be supported. During the interactive calibration phase, see if you can eye match them while hitting the desire whitepoint. Also see if that help making calibrated image "correct", as it is pretty good override/load the icm/profile properly.


The confuse part for most people is that there is two part when one "calibrate" a display. "calibration" and "profiling".

 

yea i have realized that but i am shocked on how off the calibrated profiles are -_- Maybe something is wrong.