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REVIEW: Samsung 275T Part 6


Measurements and calibration

We then tested the Samsung SyncMaster 275T for its colour fastness and suitability for calibration. The results are mainly relevant for graphics and video processing. They are not as important for office use and gaming, since the subjective impression is more important here.

Unfortunately, the Samsung 275T does not offer any possibility to regulate the RGB values manually; instead, the user must use one of the pre-defined colour temperature profiles. Here, the pre-set profile "Normal" is quite near to sRGB in terms of white at 6500K, but with 50 percent grey at over 7000K, it is too cold for sRGB output.

The "Warm1" profile, on the other hand, is too warm, with white values of almost 6000K, but its 50 percent grey is closer to the desired 6500K. We recommend that you use one of these settings; however both are still somewhat unsatisfactory given the colder grey gradient.

Gamma adjustment

The gamma value on the Samsung 275T can be changed in steps of 0.1er to between -0.2 and + 0.6 in the menu. However, we must advise against use of the gamma adjustment function, since it produces erroneous results: the black value is increased as soon as the gamma value selected deviates from 0.0 and the contrast suffers as a result.

In addition, the LCD displays different colours in the right third of the picture than in the rest. Since use of the gamma adjustment function also causes banding in grey gradients, it offers no advantages.

Brightness regulation

As mentioned already, the brightness regulation on the Samsung SyncMaster 275T is somewhat unreliable. When the brightness is adjusted, a higher brightness level is reached which then drops slowly by up to 15 percent within about 30 minutes.

We have already criticised this strange backlight behaviour in the Samsung 245B, which could only be calibrated to definite values with difficulty because of this problem. The same problem arises with the backlight control electronics used in the SyncMaster 275T.

This behaviour is not linked with the necessary warming up period but rather arises every time the brightness is changed by a considerable amount. Even switching the monitor on and off quickly causes this problem to appear.

Colour space

Samsung recently announced that the SyncMaster 275T would cover up to 92 percent of the L-Star colour space, although the word L-Star was only to be found in the small print. In the meantime, the data sheet has been changed by the manufacturer.

Now the monitor is advertised with the statement: "displays 15% more colours than conventional LCDs ". Whilst the original statement was confusing because normal users would not be familiar with the L-Star colour space, it was definitely closer to the truth.

The LCD in fact absolutely does not display "more colours", but, like so many other monitors, displays a maximum of 16.77 million colours. However, the reproducible colour space (Gamut) is significantly larger than that of conventional LCD monitors.

NEC compares the gamut of its LCD2690WUXi with the NTSC and Adobe colour spaces; other manufacturers would probably select their own approaches, depending on what is easier to market. However, for the end-user, this means that it is more difficult to make comparisons.

To make the best of the situation, we compared the colour space of the SyncMaster 275T with numerous major colour spaces.

Adobe RGB (Coverage approx. 92%)

adobergb1 adobergb2

Three-dimensional comparison of the monitor’s colour space (black grid) with the Adobe RGB colour space (white grid). The coloured box shows the intersection, or that part of the target colour space that the monitor can display. Please click the images for enlarged view and explanation.

sRGB (Coverage approx. 96%)

srgb1 srgb2

Three-dimensional comparison of the monitor’s colour space (black grid) with the sRGB colour space (white grid). The coloured box shows the intersection, or that part of the target colour space that the monitor can display. Please click the images for enlarged view and explanation.

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