NEC Spectraview 1990 Users Manual

							
	SPEC TRAVIEW	II 	- 	USER’S 	GUIDE 	|	11
2	
Dialogs,	Settings	and	Menus
Main SpectraView II window
The SpectraView II window shows the current settings and status of the display calibration. All of the features of 
SpectraView are accessed from this window and the menus.
Edit Target 
Opens the Calibration Target 
Configuration dialog box used to 
modify Target settings.
Open Previous Monitor 
Calibration 
 Previous calibrations can 
be loaded and viewed. 
The display settings and 
ICC/ColorSync profile 
for the display will be set 
automatically.
Display listbox 
Selects which display to 
calibrate if more than one 
display is present. 
Targets listbox 
Selects an existing 
Target setting. 
Targets that have 
been calibrated have 
green check mark.
Calibrate 
Calibrates the currently 
selected display to the 
currently selected Target 
Settings.
Calibration On 
Turns the display 
calibration on or off.  
Open Target 
Opens a Calibration Target 
file.
Save Target 
Saves the current Target 
Settings to a Calibration Target 
file.
         
						

							
1	 |	SPEC TRAVIEW	II 	- 	USER’S 	GUIDE

Target Settings
The Target Settings group shows the current calibration Target parameters for the currently selected display 
monitor. The Target Settings can be modified, saved and loaded using the Edit, Open and Save buttons. 
The  Target  listbox  shows  all  of  the  available  Targets.  When  the  display  has  been  calibrated  to  a  particular 
Target, a green check mark appears next to the Target name, indicating that the calibration is available. Different 
calibrations can be automatically restored by selecting different Targets that have been calibrated. This makes 
it  easy  to  quickly  change  between  different  calibrated  Target  settings.  The  green  check  mark  will  change  to 
yellow once the calibration for that Target has passed the recommended recalibration time, indicating it is time 
to recalibrate that particular Target.
White Point shows the Target White Point.
Gamma shows the Target gamma or Tone Response Curve type.
Intensity shows the Target display intensity value.
Contrast Ratio shows the Target contrast ratio.
Calibration
The Calibration  group  shows  the  current  calibration  status  of  the  currently  selected  display  monitor  and  is 
where the monitor calibration process is started. 
The display monitor can be calibrated to the current Target Settings by clicking the Calibrate button. Note that 
this Calibrate button will be disabled if either no supported color sensor or display monitor was detected. See 
the Troubleshooting section for more information.
Status  shows  the  current  calibration  status  of  the  display  monitor,  either Calibrated, Uncalibrated,  or 
Calibration Off. 
Last shows the date and time that the display monitor was last calibrated.
Next Due shows the number of days until the display is next due for recalibration, or the number of days past 
when  it  was  last  due  for  recalibration.  This  is  based  on  the  date  of  last  calibration,  and  the Recalibration 
Reminder Period in the Preferences dialog. 
If the display is not currently in a calibrated state the Calibration On checkbox will be unchecked. If the monitor 
OSD  controls  are  locked  using  the Lock  OSD  Controls  option  in  the Preferences  dialog,  the  OSD  controls 
will  be  automatically  unlocked  when  the Calibration  On  checkbox  is  cleared.  Selecting  the  checkbox  will 
automatically re-configure the display monitor to its previously calibrated state.
The Open button will open the Previous Monitor Calibration dialog which shows all of the previous calibrations 
that  have  been  performed.  It  is  possible  to  view  the  detailed  results  of  each  calibration,  as  well  as  manually 
selecting a previous calibration to load. Loading a previous Monitor Calibration will automatically configure the 
display and re-generate the ICC/ColorSync profile, if one was generated when the calibration was performed. 
This feature can be used to manually switch between different monitor calibrations with different Target settings, 
or to restore a particular calibration.
Note: The Monitor Calibrations are specific to each individual display monitor and can not be used to load the 
calibrated settings of one display monitor into another, even if they are the same model. This is because of the 
individual tolerances and characteristics of each display monitor .
Display
The Display  group  is  used  to  select  the  display  monitor  to  calibrate  if  more  than  one  display  is  present  on 
the system. Displays can be selected from the listbox and the Target Settings and Calibration status will be 
automatically updated. Note that Target Settings are independent for each monitor when multiple monitors are 
used, so each display monitor can be calibrated to different Target settings if desired.
 
						

							
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This Display Configuration dialog is accessed either from 
the Edit menu, or by clicking on the Display: Configure 
button in the main SpectraView window.
If  more  than  one  display  is  being  used  on  Windows,  it 
may be necessary to manually configure the relationship 
between the display layout on the Windows desktop, and 
the  display  monitors  that  are  connected  to  the  system. 
Correct  configuration  of  this  relationship  is  necessary 
so  that  the  display  monitor  adjustments  are  sent  to  the 
correct  monitor,  and  that  the  calibration  is  performed  on 
the correct part of the desktop.
A  diagram  depicting  the  display  desktop  layout  is  shown 
and  the  display  monitors  associated  with  each  desktop 
screen  is  shown.  The  monitor  associated  with  each 
display can be selected using the listboxes.
Clicking on the display rectangles will also select different 
displays on the Windows desktop. 
Note:  Some  video  graphics  adapters  may  show  several 
duplicate displays due to issues with the video drivers for 
that  adapter.  In  this  case  the  duplicate  displays  can  be 
selected to “None”.
Auto  Configure  -  Attempts  to  automatically  detect  and 
configure  the  display  monitors  to  the  display  layout  on 
the  Windows  desktop.  In  most  cases  this  will  correctly 
configure  the  correct  relationship,  but  in  some  cases  it 
may be necessary to manually configure. 
Test LUT - Tests that the video graphics adapter card LUT 
(Look Up Table) can be correctly set. Clicking this button 
with flash the screen brightness by setting the LUT in the 
video  graphics  adapter  card  for  the  currently  selected 
display.  Verify  that  the  correct  screen  flashes  when  this 
button is clicked. 
Note:  Since  SpectraView  applies  all  correction  curves  to  the  10  or  12  bit  LUT  inside  the  monitor,  the  video 
graphics adapter card LUT is always set to linear. 
Test Monitor - Tests the communications with the currently selected display monitor. Clicking this button will 
send a command to flash the monitor’s screen brightness.  If the wrong display monitor flashes then change 
the monitor associated with each display can be selected using the listb\
oxes.
Display Configuration dialog ( ÿ Windows version only)
Display Configuration button  (ÿ Windows version only) opens 
the Display  Configuration  dialog  which  is  used  to  configure 
SpectraView  II  if  more  than  one  display  is  used  on  the  system. 
See the following section.
  
						

							
1	 |	SPEC TRAVIEW	II 	- 	USER’S 	GUIDE

Edit Calibration Target Configuration dialog
The Edit Edit Calibration Target dialog is accessed by clicking the Edit Target button on the main SpectraView 
II window, or by selecting Target from the Edit menu. Custom Targets can be created using this dialog. After a 
new Target has been created, the display must be Calibrated to it. It is possible to share Target files with other 
users of SpectraView on both Windows and Mac OS platforms.
White Point
White  Point  selects  the  Target  white  point  for  the  calibration. 
Several popular industry standard White Point values, such as 
D50 and D65, are provided. 
A Native option is available that can be used to leave the White 
Point  at  the  display’s  native  characteristic  white  point.  This  is 
useful  when  the  maximum  possible  luminance  is  desired  but 
the white point is not critical.
A  custom  white  point  can  be  specified  by  clicking  the Edit... 
button to open up the Custom Color Temperature dialog.
Gamma Curve
Gamma Curve selects the desired tone response curve of the calibrated display. Options are:
Monitor Native Gamma - No correction is applied and the display’s Look Up Tables are set to linear.
Gamma Curve Value - The response curve will follow a simple gamma curve. Values between 1.0 
and 3.0 can be entered. A gamma value of 2.2 is the most popular for most applications.
DICOM Curve - The response curve follows the DICOM (Digital Imaging and Communication\
s in 
Medicine) specification. This response curve is aimed at medical use, however it can be used for other 
applications. The goal of the DICOM response curve is to have a visually linear displa\
y response. 
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Use  Scale  Factor - The  DICOM  response  curve  shape  is  based  on  the  measured  black  level  and 
Intensity. If the black level or Intensity of the display changes, then the shape of the DICOM response 
curve also changes. If a display is not expected to be re-calibrated for a period of several months, this 
feature can be used to increase the longevity of the DICOM calibration using the knowledge that the 
displays brightness will decrease slightly as it ages.  By scaling the black level and Intensity values 
used to calculate the DICOM response curve, using the Use Scale Factor value, the response curve 
can be based on the lower future black level and Intensity. The value used will depend on the display, 
its usage, and the time interval until it is expected to next be re-cali\
brated. 
Custom Curve - Advanced and custom response curves can be selected from presets or crea\
ted by 
importing a table of values. Click the Edit... button to open the Custom Gamma Curve dialog. 
Intensity
The Intensity selects the luminance or “brightness” of white for the calibration\
. Options are:
Maximum possible - calibrates the display to the maximum possible luminance that it can \
achieve. 
The actual value achieved will depend on the display’s type, its age and the white point used. This is 
not recommended when trying to exactly match two or more displays, since\
 there may be a difference 
between what Intensity each display can achieve.
Specific Level - calibrates the display’s Intensity to a specified target value. If the display can not 
achieve the specified value, it will be calibrated to the closest possible Intensity , and a message will be 
displayed after the calibration has completed.
Note: If you are unsure about what level to use for the Specific Level for a particular application, it is possible 
to interactively adjust both the White Point and Intensity using the Visual Match feature in the Custom White 
Point dialog. 
Contrast Ratio
Contrast Ratio allows a particular contrast ratio to be used if necessary. The contrast ratio is the ratio of white 
to black luminance. 
Selecting Monitor  Default  will  calibrate  the  display  to  the 
highest possible contrast ratio, which is limited by the display 
technology,  the  selected  White  Point,  Intensity  value,  and 
other factors. 
In some applications, such as simulating low contrast images 
such as in newsprint, it is useful to have a lower contrast ratio 
than the display’s native value. Contrast Ratios in the range 
of 50:1 to 500:1 can be selected. 
Note:  If  the  selected  contrast  ratio  is  higher  than  what  the 
display is actually capable of achieving, then the display will 
calibrate  to  the  highest  possible  contrast  ratio.  If  a  specific 
Contrast  Ratio  is  selected,  it  is  recommended  that  the 
number of Calibration and Measurement Steps be set to at 
least 32 in the Preferences dialog. 
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1	 |	SPEC TRAVIEW	II 	- 	USER’S 	GUIDE

Custom Gamma Curve dialog
The Custom Gamma Curve dialog is accessed by clicking the Edit.. button in the Gamma Curve section of 
the Edit Calibration Target dialog.
Advanced response curves can be selected from presets or custom curves can be created by importing a table 
of values.
The following preset curves are available:
sRGB - A curve based on the sRGB specification that includes the offset, transition and slope 
components.
L* - A curve based on L* in the Lab specification. The L* curve is intended to be more perceptually 
uniform than a simple gamma value curve.
NTSC Video - A curve based on the SMPTE-170M specification for NTSC that includes the offset, 
transition and slope components.
SMPTE-240M - A curve based on the SMPTE-240M specification for 1125 line HD video that includes 
the offset, transition and slope components.
Custom  curves  can  be  created  and  imported  into  SpectraView  by  creating  a  text  file  with  a  list  of  numerical 
values. The text file must conform to the following specifications:
Must contain between 3 and 256 values.
Each value must be on a separate line. 
The first value must be 0.
Values must be monotonically increasing. 
When imported, the values will be automatically scaled and interpolated \
to create a Target curve. 
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Custom White Point dialog
The Custom White Point dialog is accessed by clicking the Edit.. button in the White Point section of the Edit 
Calibration Target dialog.
A custom White Point can be created by either specifying it as a Black Body radiator temperature in Kelvin, as 
CIE (xy chromaticity) Coordinates, or by interactive visual adjustment and measurement.
Values  between  4000K  and  10000K  may  be  entered  in  the  Black  Body  K  field.  The  corresponding  CIE  xy 
coordinates are automatically calculated and displayed for reference. 
CIE xy chromaticity coordinates can be entered by selecting the CIE Coordinates radio button and entering the 
x and  y values. The corresponding  correlated  black  body  radiator  temperature  and Δuv (Delta-uv)  values  are 
automatically calculated and displayed for reference. The Delta-uv value indicates how far the xy coordinates 
entered are from the black body radiator locus.
A  custom  White  Point  may  be  measured  using  the  calibration  sensor,  and  automatically  entered  in  the  CIE 
xy chromaticity coordinate fields by clicking the Measure button. This is useful for “cloning” the white point of 
another monitor. 
The color sensor can be placed over the white circle on the right of the dialog in order to take a measurement of 
the white point by clicking the Measure button. The circle can also be used to visually compare the white point 
to another reference such as a lightbox. If a larger area of white reference is needed, selecting White Screen 
Background will fill the entire screen background with white.
The luminance and color of the display can be interactively adjusted to visually match a reference if necessary.  
To interactively adjust the color of the display, 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.
Once a visual match is found, the adjusted white point must be measured by clicking the Measure button and 
measuring  the  white  circle  with  the  color  sensor.  This  will  update  the  Target  white  point  values  with  the  new 
White Point values. 
 
						

							
1	 |	SPEC TRAVIEW	II 	- 	USER’S 	GUIDE

Preferences dialog
Preferences dialog - Calibration Sensor tab
Sensor Type - selects the model of calibration sensor to use, and shows the current\
 model being used.
Auto-Detect - attempts to detect the selected model of calibration sensor. SpectraView will automatically detect 
the calibration sensor when the application is started, however if the sensor was not connected at that time, or 
if it was being used by another application, then it may be necessary to\
 re-detect it.
Note that if the sensor was not attached when SpectraView was launched, then it may be necessary to exit the 
SpectraView application and launch it again.
Model and Serial # - shows the model and serial number of the currently selected calibrati\
on sensor device.
Average low light measurements - will average several color sensor measurements to improve the accuracy 
of  low  luminance  measurements  (below  10  cd/m²).  Selecting  this  option  will  increase  the  monitor  calibration 
time.
The Preferences dialog is accessed from the Edit menu (ÿ Windows) and SpectraView II  application menu 
( Mac OS). It is divided into 5 different tabs. 
The default settings for the entire Preferences can be restored by click\
ing the Defaults button.
Note: Due to the technology limitations of the color sensor compared to the human eye, for some applications, it is 
sometimes better to visually match a white point using this interactive method, and then measure it using the color 
sensor. 
 
						

							
Calibration  and  Profile  Steps -  selects  the  number  of  measurement  steps  to  take  when  calibrating  and 
profiling the display. A larger number of steps will generally result in a more accurate grayscale calibration, but 
will increase the calibration time. 32 steps is the recommended setting \
for most applications. 
Recalibration  Reminder  Period  -  sets  the  interval  after  the  display  is  calibrated  until  a  calibration  reminder 
message  is  displayed.  The  default  value  is  2  weeks.  Select Never  if  you  do  not  want  to  be  reminded  to 
recalibrate the display. 
Calibration Priority - selects the algorithm used to calculate the display’s response curve. Options are:
Maximize Contrast Ratio - will maximize the display’s contrast ratio by making black as dark as 
possible at the expense of grayscale color tracking near black. 
Best grayscale color tracking - will generate the best grayscale color tracking in the black areas, a\
t 
the expense of a slightly reduced contrast ratio. This option will not be used if a calibration Target with a 
Contrast Ratio of other than Default is used.
Extended  luminance  stabilization  time  -  increases  the  waiting  time  for  the  display  to  stabilize  while  the 
luminance is being adjusted. This option can be used if necessary to increase the accuracy of the luminance 
adjustment  when  a  Target  with  a  Specific  Level  of  Intensity  is  being  used.  It  may  significantly  increase  the 
calibration time, and is normally only useful when a very low intensity value is used. Try selecting this option 
if the calibrated Intensity is significantly different than the Target value due to the display stabilizing during the 
calibration and profiling steps.
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Preferences dialog - Calibration tab
 
						

							
Preferences dialog - ICC Profile tab
0	 |	SPEC TRAVIEW	II 	- 	USER’S 	GUIDE
Generate ICC Profile after calibration - selecting this will automatically generate an ICC/ColorSync monitor 
profile after the display is calibrated. This option should be checked for most applications.
Set  as  Windows  Color  Management  System  Monitor  Profile  (ÿ  Windows  version  only)  -  selecting  this 
will automatically associate the generated ICC monitor profile with the Windows Color Management System. 
This option should be checked for most applications.
ICC  Profile  file  name  -  selects  how  the  ICC  Profile  file  is  named  when  an  ICC  Profile  is  generated,  for 
example after calibration. 
Set Automatically - the profile will be automatically given a name and description.  This is the 
default setting as it is not normally necessary to manually name the profile file.
Prompt for file name and description - a prompt will appear and the file name and description 
can be entered manually.
Storage  Location  (  Mac  OS  only)  -  specifies  where  the  generated  ICC/ColorSync  profiles  are  stored. 
Options are:
Per User of this computer - the profile is stored in the User’s profile folder. Profiles in this folder 
are typically not accessible from other user accounts.
Shared by all users of this computer - the profile is stored in the shared profile folder that is 
accessible by all user accounts.
Source of primary color chromaticities for ICC Profile - selects what values are used for the Primary Color 
Chromaticities that are stored in the ICC/ColorSync monitor profile. The values are used to describe the color 
gamut of the display.
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