About Video Calibration


Ever notice in the video store that every video display seems to look different?

Which one is "right"?

What is "right"?

Video displays (common term: TV sets) come from the factory "pre-set" to sell on the showroom floor.  This may vary based on the particular philosophy of the manufacturer, as well as the physical condition of the set (manufacturing tolerances, etc.) and the "tweaking" (usually for personal preference) by store personnel and customers who may have gotten into the display's user menu.  Common "tricks" to make the picture sell are:
  • Make white bluer to make it appear brighter.  (Think adding bluing to laundry).
  • Drive contrast high (never mind that highlights will be clipped).
  • Distort blacks (eliminating shadow detail) to make the display appear to have "better" blacks.
  • Tweak Red ("Red push") to overcome the added blue in white.
  • Add artificial "enhancement" to image edges to make the picture look sharper (and "pop").
Many manufacturers do provide picture modes and other user adjustments that allow the user to "tame" the display somewhat - but the question remains:

What is right?

In the  video industry "right" is fully defined by the Society of Motion Picture and Television Engineers (SMPTE).  The Imaging Science Foundation (isf) has promoted meeting these standards in consumer level equipment.  Part of their effort is working with industry to promote the ability of consumer displays to meet these standards, as well to train personnel in adjusting consumer displays to meet these standards.

Isf calibrators are trained (and certified) in the science of meeting these standards.  Doing that (true isf calibration) is what we are all about.   We are not about getting the most "pop" in a picture - we are all about getting the most accurate picture.  The whole idea is that the customer will see the same picture that the director intended the viewer to see.

There are several pages here that might be of interest.
  • Frequently asked questions.  These are mostly from the isfForum, the public portion of a website where most of the active isf certified calibrators exchange information.  A particularly important one deals with what a calibration will not do!    BTW, you will notice that I have contributed to several of these FAQs.
  • A description of the typical calibration process that I use.  There may be some variations in this process, based on the design of the particular display, its environment, and customer concerns/preferences.
  • A typical calibration report.  The ("before/after") documentation that I provide to every calibration customer.
  • A simplified (well, I hope it is) explanation of the color science behind calibration.  This includes a description of the C.I.E. color space, display gamut, primary colors, and color temperature.
  • Some Tips on getting a more accurate picture without hiring us to do a full calibration (or what to do until the calibrator arrives).
  • Also, there is a sidebar that discusses the latest in HDTV.
  • Finally (and most importantly), I have information on my charges and how to order a calibration for your set.

Dave Hancock                                                 
 NEW!

New to HDTV?  Often new HDTV owners are not taking advantage of their new sets to receive the stunning picture that their set is capable of.  

What's New in TV?

3D TV:  The latest "industry buzz" is all about bringing 3D to the home.

The scoop on 3D TV.

3D TV FAQs


"Techie" Articles

About a year ago The New York Times published an interesting article talking about TV specs (Can They Be Trusted)?
TV Specs: Can They Be Trusted?
Though the article is a year old, it still holds true today.

The article links to a study by  Dr. Raymond Soneira, who is widely respected in industry.  Here is a recent article by Dr. Soneira on the same subject:

(email Dave Hancock)