August 01

Color management guide by Arnaud Frich

Generalites about colors Monitor calibration Printer calibration Manage colors with Photoshop Resources on Color Management

Updated on March 31, 2018

Eizo ColorEdge CS240 monitor review

EIZO CS240 monitorYes, it is possible to buy a 24-inch monitor by the brand Eizo, a ColorEdge moreover - synonym of quality - less than £660! But what is it worth taking into account that the manufacturer also sells a 24" more than £1,500 which is an absolute reference?

To introduce briefly this Eizo monitor, the first of the ColorEdge series, it is a 24-inch monitor aimed at photographers and other graphic designers (1,920x1,440 - 0.27 mm pitch - 94 ppi) with a new generation glossy panel, using IPS technology (white LEDs), a LUT table on 16 bits and wide gamut hence covering a gamut very close to Adobe RGB 98. It can thus be classified in the category of so-called "Graphic Arts" screens. It is sold just below the symbolic threshold of £660 (june 2016).

New ! The CS2420 replace the CS240 from June 2016

Among the new features, which are not many but always welcome: :

  • The display is new : new display and contrast 1250:1 mesured, Delta E 0,23, Magnificent !
  • Still 1920 x 1200 displaying Adobe RGB 98,
  • But thinner edges: -10 mm on each side for a tighter multi-screens configuration,
  • Electrostatic buttons on front,
  • HDMI, DVI and DisplayPort + USB 3.0 inputs!
  • Reviewed on this website...
    Just a word : Magnificent !





Presentation of the monitor Eizo CS240

Here are a few illustrations of this monitor to the flawless ergonomics to start with...

Pictures of Eizo CS240 monitor


Main technical characteristics of the Eizo CS240...

Size : 24-inch 16:10 - 1,920 x 1,200 - 94 ppi
PlateIPS LED white diodes - Glossy panel,
Calibration program:
ColorNavigator (hardware calibration but without colorimeter)
Color space: Adobe RGB 98,
Brightness/Contrast: 350 Cd/m2 / 650:1 (Measured)
Wirings: DVI + Display wire + HDMI. (HUB 2 x USB 2.0)
LUT table: 16 bits - hardware calibration.
Sides: thick (27 mm).
Delay: 12 ms.
VESA compatibility: Yes (100mm).
Cap: no.

Guarantee: 5 years.

New EIZO CS2420 Price Seller

Bulkiness and perceived quality

The monitor has a 24-inch panel and is 580 mm large. It is bulky for a 24". As for the perceived quality, it is excellent really. Nothing to change.

The monitor and its panel

Eizo CS240 monitor1 - Definition/resolution - It is thus a glossy IPS panel, normal on this range of screens called "Graphic Arts", with a definition of 1,920 x 1,200 pixels. Its resolution is thus 93.8 ppi. Classic and not "Retina" but guess what, thanks to the superb anti-reflections treatment I'll be mentioning again below, pixels seem almost invisible from a "normal" viewing distance on a desk (24''); all very beautiful. The backlighting is a white LED type.

2 - The panel and its anti-reflections treatment - I've been noticing for a little while and clearly on this screen that a "glossy" anti-reflections treatment doesn't show on the pixels anymore, which gives to this panel a splendid rendering on images and gradients. Very beautiful. Exit anti-reflections treatments that give pixels a grainy touch. Phew!

3 - The program for hardware calibration - This monitor is sold with its calibration program: the famous ColorNavigator – It is supposed to guarantee you a calibration that is ideal and above all easy to perform, for those who don't master the meaning of all target values. So good.

Thickness of the sides of the screen

They're 27mm thick so what we have here is a bulky screen, not favoring multi-screens configurations. (Read: my purchasing advice for photo monitors )

Ergonomics (see photos above)

Ergonomics is classic but a wire grommet in the foot would be welcome! The range of motion of the screen in height (on 150 mm), tilting and rotation will enable all users to find their ideal setting. Really perfect! The menu buttons on the screen are classic, not too elegant though but it is of course a detail.





After calibration, what is it like?

Of course, I calibrated this screen using my reference sensor - all monitors have to pass this test! - the best sensor currently on the market (except the superlative and very expensive Basic) with excellent value for money: the i1Display Pro + program iProfiler (version 1.6.3). You'll thus see that the figures are already hardly believable so it should/could only be better with ColorNavigator but I'm afraid you won't see the difference even if the figures are even better... And that is if you don't hit the limits of measurement of the sensor. We're talking of an average Delta E of 0.25 (norm 2000) hence a gap of 1/400 relatively to the ideal value where a particularly well-trained and powerful eye, traditionally, doesn't see any difference under 1/200. (With that said, ColorNavigator has other interesting assets for advanced users). Indeed, monitors nowadays wash whiter than white!

Here are the monitor settings I chose:

  • Color space: Adobe RGB 98
  • Gamma: Adobe RGB 98 (2.2)
  • Contrast 50% by default,
  • Color temperature: 6500K.

And the target values in the program...

  • Screen technology: choose white diodes,
  • D65 or possibly a little less if you want a bit warmer screen. (Note that at D55, the monitor is really warm but not yellow as with low-range monitors),
  • Luminance: from 80/90 Cd/m2 if you print in a dark environment but it can be more depending on your main use and the brightness of your room,
  • Contrast: Native or 287:1 (for those who print a lot),
  • Of course, gamma at 2.2 – standard curve,
  • ICC norm: V2 (to avoid problems of incompatibility with certain images viewing programs (images rendered too dark) and of course V4 if you know what you're doing.

And the result is?

Objective data: what does the final report say after calibration?

Miracle: Delta E (1976 norm) figures are outstanding since they're sensibly below 1 for the less well-rendered colors (0.93!!!), where a sharp eye doesn't see a difference anymore: and an average value of 0.45!!! Using new 2000 norms it falls down to 0.26 and 0.60!!! It is simply perfect! And still without using ColorNavigator, moreover (if it can still bring something which won't be visible anyway!). We're close to perfection in figures and I know we're millions of pairs of eyes that can consider this screen perfect from a colorimetric point of view! Perfection lovers can thus try to improve these figures with a hardware calibration and ColorNavigator but I'm not sure their eyes will see a difference... and I'm not even sure the figures will necessarily be better because we're reaching the limits of sensitivity of the sensor, small uncertainty mistakes.

My opinion! I just wanted to show you here that in the presence of an excellent monitor, even a calibration made with an excellent sensor but not necessarily the "best" program and a hardware calibration it is possible to get "perfect" results for very - very - good eyes, even sharp! Nothing keeps you from going even further of course... if you can see the difference or if you just like the idea of doing it! Except for relatively cheap 4K, I don't see what better can Eizo do...


Rapport final Delta-E de l'Eizo CS240

Caution, it is the report already flattering for the delta e of the CS240 but only according to the 1976 norm. With the new 2000 norm, you can divide the figures by 2 (0.26 and 0.59)! It's almost deliriously perfect.


What about hardware calibration?

Ideally, I would recommend you to calibrate your screen in hardware mode using ColorNavigator, meaning that:

1 - You need to plug in the USB 2.0 wire sold with the screen,
2 - Then reset the colors of your screen and choose Calibration mode 1 or 2 ,

3 - Follow the usual calibration process in ColorNavigator: D65 or D55, 80 or 100 Cd/m2, native contrast, gamma 2,2.

At the end of the calibration process, the profile is sent directly to the LUT (16 bits) of the monitor for better color gradients.

Dégradés de gris plus beau avec un calibrage hardware... en théorie

Introduced like this, any photographer would want hardware calibration! On new generations of screens, it is just "a bit less" spectacular... and even trivial sometimes. But commercials are well done. I even wonder what miserable screen they take as a first example. Even on my HP 23Xi at £150 I get way better results. Well well...

Now let's see harmonization tests in brightness and color temperature:


Mesure harmonisation de la luminance de l'écran Eizo CS240


Again, these are superlative reports! Of course, in CT, it follows the same path: a maximum gap of 35K! All of this is incredible... Yes, Eizo does indeed have a step ahead its competitors regarding screen uniformity.

And my subjective data: what does my eye see?

A reference in terms of color display, grey display, subtlety in saturated colors and in the display of shadows and everything else. I'm telling you, it is perfect!




Conclusion and my rating!

Eizo CS240 4.5 stars by Arnaud FrichThe conclusion is obvious: the top of the basket in display quality for £660 "only" in 24". Make it £960 and you have the CS270 in 27" (August 2016)! The most incredible, in my opinion, is that furthermore, this type of screen is very easy to calibrate. No need to make multiple tests changing this and that to get perfect colors, really neutral greys and tutti quanti.

So what does it leave to its big brothers: CX241 and other CG247? Built-in sensors, caps, something-guarantees but you need to be aware that they use the same panel although less "carefully selected". When I see the Delta E values I get with these "first draft" panels, I think that it doesn't matter the least bit. Who can see a difference with their eyes (and not with a sensor)? This person can then buy the CG247, end of the discussion!



  Eizo CS240      
Manufacturing quality
4 étoiles
3,5 étoiles
94 ppi  
5 étoile
5 étoiles
  Colors restitution 4 étoiles Average Delta E: 0.25!  
  Uniformity 4 étoiles    
Value for money
4 étoiles
  • Record values after calibration: average Delta E of 0.25 and maximum gap of 0.60 (2000 norm) while the eye has a hard time seeing differences under 1!
  • Perfect colors!
  • Neutral greys that are really neutral!
  • "Glossy" matte IPS panel with a perfect rendering, smooth without the grainy effect of older generations,
  • Wide gamut (Adobe RGB 98) ,
  • Unbeatable value for money!
  • Except its bulkiness, I can't think of anything!
  • All right, just to say something: texts are even sharper on the BenQ PG2401PT.
  • Only 4K at the same price is missing!
9.5 / 10... not to say 10!


My opinion: Such beautiful colors, such a high fidelity, really neutral greys and an almost perfect homogeneity for less than £660 (in 24"): a bargain according to me, and I knew the time when you had to spend three times this sum for the same thing (in sRGB, I might add!). If you don't need a cap and all the CX and CG guarantees, you have here a reference because delta Es are identical and visual differences invisible to the naked eye! How pleasant it is to try this kind of equipment which, in addition, doesn't cost a fortune... A master purchase, really!


Buy the new Eizo CS2420 (replace CS240) from this site

Eizo CS240 monitor

Eizo CS2420
incl. taxes




i1Display Pro X-Rite


  Buy the best colorimeter : the i1Display Pro!
Read my full review Suivre


New! i1 Studio


  New ! i1 Studio X-Rite.
Read my full review in french - soon in EnglishSuivre


From £111.50



Summary > Eizo CS240 review



This website is almost entirely free and yet almost free of ads. Why? Because they look so bad! It is lucrative though, and enables many websites to keep on living. So I asked myself: what can I do? To keep on developing this website, I'm going to need a regular income just like everyone else. How can I keep on giving access to free information like I've been doing since April 2002?

And I finally found the answer: affiliation. Every time you click on a link from this site to one of my partners' shops, they know you've been referred by me and give me a small percentage on your purchase, be it something I recommend on my website or anything else. Remember to use my links when you shop on these sites! It doesn't cost you anything and it's a win-win deal – for me, them, and you!


  Thanks for your visit and your support!  




Home page |  Summary  |  Novelties ! |  Legal information  |  Contact me

French version US version    
Calibrate a monitor
Calibrate a printer
Manage colors