Display Consistency vs Absolute Calibration

[Anonymous]

Does anyone have experience with getting displays to look similar as opposed to perfectly calibrated? On our events we often use more than one display showing the same source. This is especially critical when using multiple projectors in a blended image.

It is more important for us that the images look the same than making sure that each display device is correctly calibrated. I have tried on several identical LCD panels that comprise a LCD wall. Getting the grayscale right and then reducing all other CMS errors is no guarantee that two display devices that are the same make, model and age will look the same.

I completed the THX video calibration course earlier this year so I do have the test gear and software and have gained some experience calibrating individual displays. I would appreciate help from someone who has done this.

Topic

[Gregg Loewen]

get the light output to match, get the 2 closest edges of the displays to match.

Remember that if you are working with front projectors and screens with gain you, if you have 2 different viewing angles, you will see different results. Same goes for LCD panels relating to viewing angles.

[Anonymous]

Greetings

Gregg got it.

Now repeating …

If doing two projected images … calibrate the left side of one image to the right side of the other image. The transition will be seamless that way even if screen uniformity changes the color of the image by the outside edges. The transition point is the most important thing to get right.

Now if you are dealing with 4 displays … then you need these video wall processors that will change the color of an image on different sides of the image.

Regards

[Anonymous]

You make it sound simple. Should I be calibrating both images or do I just try and match the second one to look like the first one. Do I get the grayscale as best as possible on both? After that do I measure the exact values of the primary and secondary colors at the edge of the first display and then try to replicate those values on the second display?

[Anonymous]

Greetings

The calibrations do not really have to be to d65 … but it is easier to do that since it is a known target number … versus some random one you pull out of your head.

Of note though …. I just did a job last week with two dlp W32 Projection design units on a gain screen …. the edge match was done at one point on the left edge and then the corresponding point on the right edge … but the entire edge was not uniform itself. So edge match was imperfect as only the matched areas looked the best but as you look up and down the edge, you see the changes between the two images.

Viewing angles on the gain screen also affect this. When standing head on looking at the edge match … the blend looks great … walk 3 feet either way and one image gets darker than the other one …

Regards

[Author]

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