[vga50]

Сообщение от fed

Тогда зачем в функциях LCD монитора предусмотренна настройка гаммы? И какой, в данном случае, физический смысл этой настроки?

Мне кажется, физического смысла у этой настройки на LCD нет. А есть имитация подражание CRT дисплеям. Т.е. установите гамму 2.2 на LCD - распределение яркостей будет аналогично CRT дисплею с такой же гаммой.

Если хотите подробнее - вот научная статья по теме LCD vs. CRT для отображения картинок, где (помимо прочего) выводится необходимость для использования более сложных моделей при калибровке LCD, чем гамма-оффсет, которой было достаточно для CRT: http://www.ece.rochester.edu/~gsharm...rtprocieee.pdf

1) Color Calibration: From the preceding sections, it
is clear that LCDs and CRTs are similar in several respects
from the perspective of color calibration. Identical models
based on channel independence and channel-chromaticity
constancy can be used for the calibration of either type
of display and the runtime mapping of images to display
color coordinates can also be performed using the inverse
model of Fig. 2 in either case. For the CRT, these models
provide extremely good accuracy, whereas for LCDs,
the accuracy is good enough for most applications. For
the CRT, the use of parametric “gamma-offset” models
for the individual channel TRCs can further simplify the
characterization process and potentially reduce the number
of measurements required. The S-shaped TRCs for LCDs
are not modeled well by the parametric “gamma-offset”
models and, therefore, additional measurements may be
required for the characterization of these devices. For
the same reason, images that are “gamma-corrected” for
display on a CRT will not have the proper tone response if
displayed on an LCD, unless appropriate TRCs are used in
hardware/software. Scientific applications involving very
precise control of the displayed color require more elaborate
calibration schemes for the LCD. Note also that due to the
significant difference in spectral characteristics of the CRT
and LCDs, the impact of chromatic aberration in the eye
will be different for the two displays and may need to be
compensated when displaying complex images for precise
psychophysical experiments [41].