NEC Spectraview 1990 Users Manual

							
Preferences dialog - Interface tab
Options are:
Automatic - the optimal setting based on the color sensor model and the display m\
onitor type is 
automatically used.
Calibration Sensor - uses the values measured by the calibration sensor. For normal color gamut 
displays this is the recommended option since the calibration sensor can\
 accurately measure these 
primary colors. For wide color gamut displays some colorimeter based cal\
ibration sensors may not be 
able to accurately measure the primary colors and it is recommended to u\
se the Factory Measurement 
option. For spectral based calibration sensors, either option can be use\
d. 
Factory Measurements - uses the measurements taken during production of the display monitor \
to 
encode the color gamut information in the generated ICC Profile. These measurements may be more 
accurate than those of some color sensors when measuring wide gamut disp\
lays such as the P221W, 
LCD2180WG-LED, LCD2690WUXi, LCD2690WUXi2, and LCD3090WQXi
•
•
•
	 SPEC TRAVIEW	II 	- 	USER’S 	GUIDE 	|	1
Luminance Units - selects the units that luminance values are displayed in. Options are\
:
Candelas (cd/m²)
Foot Lamberts (fL) 
Automatically  load  settings  on  Target  change  -  automatically  loads  the  most  recent  Monitor  Calibration 
Settings  when  a  different  Target  is  selected,  and  will  generate  a  new  corresponding  ICC  Profile.  Using  this 
option allows different Targets to be selected and the monitor will be automatically configured.
Confirm display calibration status each time application is launched - selects if the current monitor settings 
should  be  checked  and  compared  with  the  settings  for  the  last  calibration  when  SpectraView  is  launched.  If 
the monitor settings are different a warning message will be displayed, and the last calibration settings can be 
reset. This checking operation will take several seconds each time SpectraView is launched.
•
•
 
						

							
Preferences dialog - Display tab
Lock OSD (On Screen Display) controls when calibrated - selects if the monitor’s On Screen Display control 
buttons are locked when the monitor is calibrated. Locking the controls can be useful to prevent accidental or 
unauthorized adjustment of the monitor once it is calibrated. Options ar\
e:
Don’t lock 
Lock all except Bright and Contrast
Lock all
Note: The controls will be unlocked if the calibration is turned off in the main window. 
Use Auto Luminance (if supported) - enables the Auto Luminance sensor circuit inside the display monitor 
to increase the Intensity (brightness) stability as the display ages and warms up. This feature will not be used 
for  Targets  with  “Maximum  Possible”  Intensity  selected,  or  if  the  Target  Intensity  falls  outside  the  range  that 
the  Auto  Luminance  circuit  is  capable  of  controlling.  This  feature  is  only  available  on  the  following  models: 
LCD2490WUXi, LCD2690WUXi, LCD2690WUXi2, and LCD3090WQXi.
•
•
•
	 |	SPEC TRAVIEW	II 	- 	USER’S 	GUIDE
Downloaded	from	ManualMonitor.com	Manuals 
						

							
	SPEC TRAVIEW	II 	- 	USER’S 	GUIDE 	|	

The Information  window  is  accessed  from  the Tools  menu.  It  will  also  be  automatically  displayed  after  a 
display calibration is completed. 
Information window
Note: The graphs shown in the Information window can be panned, zoomed and scaled. Click and drag to 
select a zoom area. Use the arrow keys to pan. Size the dialog to scale the graphs. 
The  graphs  and  information  can  also  be  copied  to  the 
clipboard  and  pasted  into  other  document  and  image 
editing applications by right-clicking and selecting Copy. 
This  is  useful  for  sharing  and  documenting  various 
results
Information window - Summary tab 
White Point
The Target  values  are  the  currently  selected  Target’s  White  Point.  The Calibrated  values  show  the 
actual measured White Point after the display has been calibrated.
The Delta  E  value  is  the  calculated  color  difference  between  the Target  and Calibrated  White  Point 
using both the color and luminance.  This is calculated using the Delta E CIE 94 color formula. A Delta 
E  value  of  1  is  considered  just  perceptible  to  50%  of  users.  Values  under  3  are  generally  considered 
excellent for display calibration.
 
						

							
	 |	SPEC TRAVIEW	II 	- 	USER’S 	GUIDE

Primary Colors
Red,  Green  and  Blue  CIE  x,y  - shows  the  measured  color  coordinates  of  the  display’s  primary  colors. 
These values represent the color gamut of the display. The source of the color measurements will depend 
on the Primary Colors Chromaticity Source setting in the Preferences dialog.
Display Luminance
The Target values show the currently selected Target’s Black Level and Intensity. 
The Calibrated  values  show  the  actual  measured Black  Level  and Intensity  after  the  display  has  been 
calibrated. 
Contrast Ratio
The Contrast Ratio is the ratio of the Intensity to the Black Level. The Target value shows the currently 
selected  Target’s  Contrast  Ratio.  For  LCD  display  monitors,  this  is  set  to  “N/A”  since  the  monitor’s  Black 
Level is fixed. 
The Calibrated values show the actual contrast ratio calculated using the actual measured Black Level and 
Intensity after the display has been calibrated. 
Gamma Curve
Target shows the type or gamma value of the Target Gamma Curve.
Calibration  Steps  - shows  the  number  of  calibration  steps  used  to  measure  the  grayscale  when  the 
calibration was performed. 
ICC Profile
File  Name shows  the  name  of  the  ICC/ColorSync  profile,  if  one  was  generated  after  the  display  was 
calibrated.
Description shows  the  description  tag  text  of  the  ICC/ColorSync  profile,  if  one  was  generated  after  the 
display was calibrated.
Display Monitor
Model shows the model name of the currently selected display.
Seral # - shows the serial number of the currently selected display. 
Firmware - shows the internal firmware version of the currently selected display .
Current Usage shows the total number of hours that the currently selected display has \
been in use.
Last Calibration shows the number of hours that the currently selected display has been used since it was 
last calibrated.
Calibration  Date shows  the  date  and  time  that  the  monitor  was  last  calibrated  to  the  currently  selected 
target.
Calibration Sensor
Model shows the model name of the calibration sensor used when the calibration\
 was performed.
Seral # - shows the serial number of the calibration sensor used when the calibrat\
ion was performed. 
 
						

							
	SPEC TRAVIEW	II 	- 	USER’S 	GUIDE 	|	

Information window - Color Gamut tab
The  Color  Gamut  tab  graphically  illustrates  the  color  gamut  of  the  display  for  comparison  purposes  as  a  2D 
representation of the 3D color gamut volume. The display’s color gamut can be compared to the color gamut 
of several popular color spaces.
The  source  of  the  color  measurements  for  the  display’s  color  gamut  will  depend  on  the Primary  Colors 
Chromaticity Source setting in the Preferences dialog.
Selecting a reference color space will overlay the color gamut onto the \
display’s.
Colorspace
CIE xy - shows the gamut projected in CIE xy colorspace. This is probably more familiar to 
most users, however it does not allow color differences to be easily judged because this projection 
overemphasizes differences in green colors, and underemphasizes differences in blue colors. 
CIE u’v’ - shows the gamut projected in CIE u’v’ colorspace. This is projection is an improvement 
over CIE xy in that different colors are more equally represented in scale.
Show back body curve - shows the black body locus as yellow curve.
Show Target white point - shows the White Point of the currently selected target as a green X.
•
•
 
						

							
	 |	SPEC TRAVIEW	II 	- 	USER’S 	GUIDE

Information window - Curves tab
The Curves tab graphically illustrates the various tone response and correction curves measured and generated 
during the calibration process. 
Show Curve Type 
Target  -  illustrates  the  target  tonal  response  curve  of  the  currently  selected  Target.  This  display  will  be 
calibrated  to  match  this  curve.  This  curve  will  be  disabled  and  not  shown  if  the  Target  Gamma  is  set  to 
Monitor Native Gamma.
Calibrated - illustrates the actual measured tonal response curves of the calibrated display. These curves 
are generated from measurements taken while generating an ICC/ColorSync monitor profile of the display. 
If  no  ICC/ColorSync  profile  was  generated  after  the  monitor  was  calibrated,  then  this  checkbox  will  be 
disabled.
Uncalibrated  -  illustrates  the  actual  measured  tonal  response  curves  of  the  uncalibrated  display,  without 
any  corrections  applied  to  the  Look  Up  Tables.  These  curves  are  generated  from  measurements  taken 
during the calibration process. 
Correction - illustrates the correction that is applied to the display’s Look Up Tables in order to achieve the 
selected Target tonal response curve characteristics. 
Show Curve Color
The All, Red, Green and Blue buttons select which curve colors are displayed on the graph.
 
						

							
	SPEC TRAVIEW	II 	- 	USER’S 	GUIDE 	|	

Information window - Color Tracking tab
The Color Tracking tab shows graphically how well the grayscale (colors from black to white) of the display is 
conforming to the currently selected Target. Ideally all points along a grayscale measured on the display should 
have the same white point (chromaticity) and should follow the luminan\
ce curve of the Target.
Deviations from this ideal can result in grayscale color tracking errors which can be seen as shifts in chromaticity 
along  the  grayscale,  and/or  shifts  in  luminance.  The  Delta  E  values  are  a  mathematical  measure  of  these 
deviations.  A  Delta  E  value  of  1  is  considered  to  be  just  perceptible  to  50%  of  users.  Values  under  3  are 
generally  considered  excellent  for  display  calibration.  Values  above  3  will  be  highlighted  in  yellow  or  red  and 
may indicate a problem with the display’s calibration.
The  graph  shows  the  displays  actual  measured  grayscale  color  tracking  using  measurements  taken  while 
generating an ICC/ColorSync monitor profile of the display.
The horizontal axis shows the Delta E values for each measured point on the grayscale. The vertical axis shows 
the luminance for each of the measured points on the grayscale.
Note  that  since  the  Delta  E  values  are  calculated  based  on  the  currently  selected  Target.  If  a  Target  using 
Intensity: Specific Level is being used, and the display was not able to actually achieve the Target’s specified 
Intensity value, then this will result in large Delta E values.
Delta E 
Average - shows the average of all the calculated Delta E values. 
Maximum - shows the maximum of all the calculated Delta E values.
Include  Dark  Values  -  selects  if  the  graph  and  average  Delta  E  value  calculation  include  measurements 
taken near absolute black (having a luminance of less than 5 cd/m²) on the display. Typically these values 
are  not  included  since  the  low  luminance  can  cause  measurement  errors  that  may  cause  artificially  high 
Delta E values to be shown. Selecting this option will cause all measure\
d values to be included.
Show Average - shows the average Delta E value as a vertical line on the graph displ\
ay.
 
						

							
	 |	SPEC TRAVIEW	II 	- 	USER’S 	GUIDE

Information window - DICOM Conformance tab
The DICOM Conformance tab shows graphically and numerically how well the calibrated display conforms to 
the ideal DICOM (Digital Imaging and Communications in Medicine) response when a DICOM Target curve of 
is used. 
The  aim  of  the  DICOM  response  is  to  have  a  perceptually  linear  luminance  response.  Each  step  along  the 
display’s grayscale should have an equally perceptive increase in luminance. The actual shape of the DICOM 
response  curve  is  based  on  the  display’s  measured  Black  Level  and  Intensity,  since  the  DICOM  response 
considers the human eye’s non-linear response to light.
In DICOM terminology, the grayscale level is called the Digital Driving Level and represents the digital output 
video  level,  from  0  to  255.  Each  step  in  Digital  Driving  Level,  should  result  in  an  equal  step  in  perceived 
luminance.  In  DICOM  terminology,  a  change  in  luminance  that  is  just  perceptible,  is  considered  to  be  1 JND 
(Just Noticeable Difference). So, ideally, each step in Digital Driving Level should result in an equal change in 
Just Noticeable Difference value. The JND values are calculated using a complex formula from two measured 
luminance values.
The  display  calibration  results  can  be  viewed  in  two  different  types  of  graphs, JND  per  DDL,  and Contrast 
Response, by selecting the corresponding graph type.
JND per DDL (Just Noticeable Difference per Digital Driving Level)
Average  -  shows  the  average  JND  per  DDL  value.  The  actual  value  will  depend  on  the  Black  Level  and 
Intensity of the display.
Std Dev - shows the standard deviation of all of the calculated JND per DDL values. 
Show Average - shows the average JND per DDL value as a horizontal line on the graph. 
Show Linear  Fit -  shows  the  best  fit line  between  all  the  calculated  JND  per  DDL  values  as  a  line  on  the 
graph.  Ideally  this  line  should  be  horizontal,  indicating  equal  steps  in  JDN  per  DDL  along  the  display’s 
grayscale.
 
						

							
	SPEC TRAVIEW	II 	- 	USER’S 	GUIDE 	|	

Contrast Response
Max error - shows the highest percentage error deviation from the Barten Model curve, as well as the JND 
Index of the highest error point. 
Show Barten Model - shows the Barten Model curve on the graph. The Barten Model curve is calculated 
based on the measured Intensity (white luminance) and black level valu\
es.
Show 10% Limits - shows two lines representing 10% error deviations from the Barten Model curve. Medical 
displays used for Primary Class image viewing should be within the 10% d\
eviation curves.
Show 20% Limits - shows two lines representing 20% error deviations from the Barten Model curve. Medical 
displays used for Secondary Class image viewing should be within the 20%\
 deviation curves.
 
						

							
0	 |	SPEC TRAVIEW	II 	- 	USER’S 	GUIDE

Colorimeter window
The Colorimeter tool allows measurements of colors displayed on the screen to be taken with the calibration 
sensor,  and  is  accessed  from  the Tools  menu. The  measurement  results  are  displayed  in  a  variety  of  useful 
formats. 
To  take  color  measurements  using  the  Colorimeter,  place  the  calibration  sensor  to  the  screen  so  that  it  is 
centered on the large white area in the Colorimeter window.
Measure: 
Single - clicking this button will take a single color measurement and display t\
he results.
Continuous - selecting this will take repeated measurements automatically and displa\
y the results.
The CIE XYZ and xyY fields show the calibration sensor’s measurements translated into each of the respective 
color spaces. These color spaces are device independent color spaces, which means that they are not relative 
to any specific device, as opposed to dependent color spaces, such as RGB, which is relative to the device that 
is displaying the color.
The Color Temp field shows the corresponding correlated black body radiator temperature of the measurement 
in Kelvin. The Δuv (Delta-uv) value indicates how far the measurement is from the blackbody radiator locus. 
The Kelvin value is only meaningful for colors that are near the black body radiator locus, such as most shades 
of white. 
Sample Color: By selecting this group a custom color can be shown in the measurement area. To interactively 
adjust  the  color,  click  and  drag  within  the  color  circle  or  use  the  arrow  keys.  Use  the  vertical  slider  control  to 
adjust the Intensity. Specific Red, Green and Blue values can also be entered. 
•
•