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EIZO ColorEdge CX240 Review

Gary Wolstenholme reviews the 24 inch EIZO ColorEdge CX240 monitor to see how it performs.

|  EIZO ColorEdge CX240 in Display Devices
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ColorEdge CX240
The EIZO ColorEdge CX240 provides an entry-level option to EIZO's mid range of ColorEge monitors. It sports a 24.1” LED backlit IPS display and features a built in colour correction device that will automatically periodically check that the monitor is sufficiently calibrated. Maximum brightness of the display is 300cd/m2 with a contrast ratio of 1000:1. Video inputs include HDMI, 29 pin DVI-I and Displayport, which supports 10bit colour reproduction for smoother tones. Response time is 7.7ms grey-to-grey, which should be good for video work, as anything below 8ms is considered fast nowadays. However, colour reproduction is this monitor's strong suit with it being able to reproduce 97% of the AdobeRGB colour space and all of sRGB.

EIZO ColorEdge CX240 Features

Eizo ColorEdge CX240 Monitor (1)
The monitor is supported by a nifty height adjustable stand, which easily accommodates the monitor in both landscape and portrait orientation and makes it easy to find a comfortable viewing position quickly. The monitor features a fast warm up time of only seven seconds as well as brightness stabilisation and a digital uniformity equalizer which help to ensure colour and brightness are consistent across the whole screen.

Built-In Self Correction Sensor – Once calibration has been performed with an external colorimeter, it is possible to automate calibration with the built-in correction sensor that is housed within the monitor's top bezel and pops down onto the screen when checking the calibration. A period for subsequent checking of the calibration can be set in the supplied ColorNavigator software, so that you can be sure that the colour is maintained whenever you come to use the screen.

Eizo ColorEdge CX240 Monitor (2)
EIZO-Developed ASIC at the Core - All ColorEdge models come with an ASIC (application specific integrated circuit) developed by EIZO. The ASIC has its own algorithms used in high-precision colour processing to produce smooth colour tones.

Individually Adjusted at the Factory - The gamma level for each ColorEdge monitor is adjusted at the factory. This is accomplished by measuring the R, G, and B gamma values from 0 – 255, then using the monitor’s 16-bit look-up table (LUT) to select the 256 most appropriate tones to achieve the desired value.

Multiple Inputs - DisplayPort, HDMI, and DVI-I inputs are included for connecting to various types of graphics boards. The HDMI input also offers direct connection with digital cameras. Two USB upstream ports allow two computers to be connected at once so it’s not necessary to reconnect the USB cable when using the ColorNavigator software and switching between the two computers. When using the Displayport connection, simultaneous 10-bit colour display is possible, via a 16 look-up table, which means the display is capable of displaying more than one billion colours at once. This is 64 times as many colours as is possible using a standard 8-bit display, which should result in smoother colour gradations.

Key Features

  • Built-in sensor for self-correction
  • 1920 x 1200 native resolution
  • 1000:1 contrast ratio
  • 300 cd/m2 brightness
  • DVI-I, DisplayPort, and HDMI inputs
  • Scheduled self-calibration correction possible
  • Wide Colour Gamut (97% AdobeRGB)
  • On-Screen Button Guide
  • Brightness stabilisation
  • Digital Uniformity Equalizer
  • Landscape / Portrait orientation
  • 5 year warranty

EIZO ColorEdge 240 Handling

Eizo ColorEdge CX240 Monitor (6)
The CX240 is larger than most typical 24inch displays, with a wide black bezel, and a deeper profile than most other monitors of this size and it has a no compromise, business-like appearance as a result. Weighing 9.9kg, it is a hefty beast, but the sturdy stand has no problem supporting the weight, while offering ease of adjustment for height, tilt and orientation. It's probably best to disconnect any cables before rotating the screen, the connections are easily accessible. The power light is blue, and its brightness can be adjusted to suit your working conditions. The rear of the stand has a built-in cable tidy to help direct cables neatly once everything is set up to your requirements. A cooling fan within the monitor can be heard whirring away while the monitor is on. Although the sound can be heard in a quiet room, it isn't overly intrusive being quieter than most laptop cooling fans. When the display is turned off via the standby button on the front bezel, the CX240 consumes no electricity, which should satisfy those with environmental concerns, or those simply keeping an eye on their energy bills.

Eizo Coloredge Cx240 Controls

You can quickly change between calibration profiles using the mode button, this lets you switch between a number of built in modes, as well as your own calibration settings, the modes are: User-1, User -2, User-3, Paper, Adobe RGB, sRGB, and CAL. This allows you to quickly visualise how different colour settings may affect the appearance of your work.

Eizo ColorEdge CX240 Monitor (7)

The ports available are 29 pin DVI-I, HDMI and Displayport as well as dual upstream USB and a USB hub with two sockets. There is no VGA input so owners of computers using older graphics hardware (or many Windows/Linux compatible laptops) may need to upgrade their equipment to use this display. The HDMI connection has a reduced native resolution of 1920 x 1080 at an aspect ratio of 16:9, versus 16:10 and 1920 x 1200 supported by other connections. This may be ideal for video work, even though it sacrifices some of the working space at the top and bottom of the screen.

EIZO ColourCorrector

When calibration is performed using an external colorimeter, using the supplied ColorNavigator software, an option can be selected to enable self-correction. If this is enabled, the sensor housed in the top bezel pops down during the calibration process to take a reading. It then uses this reading to apply future maintenance to the calibration automatically. Although it is a shame that the built in sensor cannot be used for the initial calibration process, it is still an excellent feature, which ensures the screen is correctly calibrated over a period of time. A feature like this will save many hours wasted calibrating displays in graphics studios with multiple displays, and will even save substantial amounts of time for a lone photographer, who demands critical colour performance.
Eizo ColorEdge CX240 Monitor (4) Eizo ColorEdge CX240 Monitor (3)

EIZO ColorEdge CX240 Performance

The resolution of 1920 x 1200 strikes a good balance between working space, and ease of use. As a result text is clear, and easy to read. The screen is very easy on the eyes, and is suitable for working with for long periods. Although the on-paper contrast ratio of 1000:1 may not seem like anything special, when compared to entry level monitors offering crazy contrast levels, black is truly black, and white is truly white with smooth gradations of colour and tone in between.

Viewing angles are 178 degrees for both vertical and horizontal, which is the same as the similarly priced NEC Spectraview 232W 23” display. Although the viewing angle is typical for a high-end display using IPS panel technology, those who are used to the older TN panel technology will be amazed by the difference this makes. Colour and brightness remains consistent, even when viewing the screen from an above or below. To the eye, the screen appears remarkably consistent in terms of brightness and colour across its surface, and there is no flicker, even under fluorescent lighting.

Video quality is excellent with solid blacks and quick refresh rates even with rapidly changing action, with no visible ghosting in transitions from light to dark. There is also no discernible backlight bleed which is common on budget orientated monitors using IPS panel technology. The matt screen also helps to ensure reflections on its surface are kept to a minimum.

1920x1200 Eizo Test Pattern

EIZO Greyscale Test - click to view full size - please note the gamma squares at the bottom are designed to work with a resolution of 1920 x 1200. You can also test your monitor for a number of factors using software available from EIZO.

Black and White / Greyscales - The EIZO CX240 delivers extremely impressive blacks and greyscale, with no discernible colour hue in the greyscale, or grey patches.

Colour performance: We set the monitor to 100 cd/m2 brightness, 6500K colour temperature and gamma 2.2, and measured the monitors ability to match this using an i1 Display Pro colorimeter with the supplied ColorNavigator software and got these results.


The contrast ratio was measured as 793:1, the colour temperature was bang on 6500K as requested, and brightness is also bang on the requested 100.0 cd/m2 requested value.

Colour performance was recorded as an Average DeltaE (ab): 1.04, with a maximum of 7.56 - the lower the number the better. It's possible to save the results of performance as a PDF document, so that you have a record of how the monitor is performing, which could be particularly important for colour critical work, or to show that your computer and monitor is set up correctly.

We also used the i1 Display Pro to measure colour, luminance, and white point performance.

Using the i1 Display Pro, 6553K was the Colour temperature achieved, Luminance was bang on 100 cd/m2 as requested and the native contrast ratio was measured as 547:1. When a colour profile was setup the corrections reduced colour saturation compared to the profile created by ColorNavigator. Average Delta E was 0.65, the maximum deviation was 1.31 (the lower the number, the better). These results are very impressive.

EIZO Coloredge CX240 Luminance White Point Results:

EIZOCX240LuminanceFigures EIZOCX240WhitePointFigures
Luminance Figures WhitePoint Figures
EIZOCX240LuminanceGraphs EIZOCX240WhitePointGraphs
Luminance Graphs WhitePoint Graphs

Digital Uniformity Equalizer does a sterling job with the brightness across the screen being consistent, with the worst result a maximum of 4% deviation in brightness, in one corner, with most of the screen giving better uniformity. Colour temperature across the screen was also very good, with the worst results a 1.6% deviation in colour temperature in the top left corner, with most of the screen giving better performance.

EIZO ColourCorrector
EIZO ColourCorrector

Value For Money

The EIZO CX240 is available for around £850 including VAT with a 5 year warranty. There are cheaper monitors available that promise similar colour performance but none of them feature a built in hardware colour correction device. 

Budget 24inch monitors with Full HD resolution (1920 x 1080) are available for around £130 to £200, but the colour performance of these displays won't be on a par with this EIZO screen. A comparable alternative is the NEC Spectraview 232W, which is a 23” IPS display sporting a 14-bit LUT and Displayport connection and costs around £780 inclusive of VAT. NEC also offer their 24” MultiSync PA242W display, which sports a 16-bit LUT, but also lacks a built in hardware correction device and costs around £790 inclusive of VAT. For what you get, the EIZO ColorEdge CX240 appears a decent value choice, especially given the quality of the display, 5 year warranty and excellent build and handling.

EIZO ColorEdge CX240 Verdict

The ColorEdge CX240 sports all the bells and whistles you'd expect from a high-end display, including a hardware correction device and excellent colour performance, but without the £1000+ price tag you'd normally expect to fork out for such an offering.

Overall colour performance, and the accuracy of black and white values, are more than good enough to satisfy even the most discerning graphic artists and photographers. The time saved by the  built in colour correction device will surely pay for itself over time, as calibration can be maintained automatically, with no input from the user. A feature like this, at this price point is a boon for graphics studios, or for anyone whose time is as precious as colour accuracy is.

Although £850 may seem like a lot of money for a monitor with a resolution and headline specification that doesn't seem all that different to displays available for a quarter of the price, it is still a sound investment, as the quality of the ColorEdge CX240 shines though, and is backed up by a comprehensive 5 year warranty.

  The quality of the ColorEdge CX240 shines though, and is backed up by a comprehensive 5yr warranty.

EIZO ColorEdge CX240 Pros

Extremely high image quality
Built in hardware correction
Portrait / Landscape Orientation
Five year warranty
Dead pixel guarantee (Full RGB pixel for 12 months)
10-bit Simultaneous display when connected via DisplayPort
Cables included in box (excluding HDMI cable)
HDMI  and DVI-I inputs
Ability to connect two computers
Built in USB hub
Consumes no power when switched off by standby switch

EIZO ColorEdge CX240 Cons

Larger than other 24inch monitors
Built-in correction device can only be used to maintain calibration so a separate colorimeter is required


EIZO ColorEdge CX240 Specifications

TFT Monitor
Screen Size (Diagonal)24inches
Device TypeLCD/TFT
TFT TechnologyIPS
Resolution1200Pixels - 1920Pixels
Aspect Ratio16:10
Dot Pitch / Pixel Pitch0.27mm
Colour SupportDisplayPort: 1.07 billion from a palette of 278 trillion, DVI, HDMI: 16.77 million from a palette of 278 trillion
Image Contrast Ratio (Max)1000:1
Viewing Angles178, 178
Input Type
  • DVI-D
  • HDMI
  • DisplayPort
Built in SpeakersNo
USB Hub Built In
  • Yes
Power Source
Power Consumption (W)38 - 98
Box Contents
Box ContentsNo Data

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