Barco Projector Toolset For Hdx Series Reference Guide

							8. Configurator, Projector adjustment settings
Image 8-20
Delete customfile via icon
How to delete, way 2
1. Click onAdjust.(image8-21)
TheInputdialog box opens.
2. Click onFileand selectDelete.
TheDelete inputdialog box opens.
3. Select thefile to delete from the list and clickDelete.
AQuestiondialog box opens to ask if you are sure to delete the selectedfile.
4. ClickYe s.
The selectedfile is deleted.
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							8. Configurator, Projector adjustment settings
Image 8-21
Delete customfile via input settings
8.6.8 Aspect ratio for selected input
What can be done?
The aspect ratio setting forces the projector to project an image using a defined aspect ratio.
Aspect ratio Description
4:3
Standard television format
16:9
Wide screen television format / anamorphic format
5:4 Workstation format
2.35
Film format
1.88
1.78
Wide screen television format / anamorphic format
16:10
Wide screen cinema format (WUXGA format)
Custom Any custom format can be set up
Some example images:
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4/3 signal16/9 RGB signal
Image 8-22
Example images aspect ratio
How to select
1. Selectfirst the input for which the aspect ratio must be set. (image 8-23)
2. Click onAdjust(a).
TheInputdialog box opens (b).
3. Click onSelect an aspect ratio(c).
TheSelect an aspect ratiodialog box opens.
The current aspect ratio isfilled out.
4. To change the aspect ratio, click onChange....
TheAspect ratiodialog box opens.
5. Select the desired aspect ratio and clickOpen.
6. Close theSelect an aspect ratiodialog box.
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Image 8-23
Select aspect ratio
If custom is selected
1. If custom is selected as aspect ratio (a), the Aspect ratio X and Y coordinates become available (d).
(image 8-24)
2. Click on the up down control of the corresponding spin box until the desired value is reached (d).
Or,
click in the input box of the spin box and enter the desired value.
3. Repeat for the second coordinate.
4. Close theSelect an aspectratio dialog box (e).
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							8. Configurator, Projector adjustment settings
Image 8-24
Custom aspect ratio
8.6.9 Input balance
8.6.9.1 Introduction to Input Balance
Introduction: Unbalanced color signals
When transporting signals, there is always a risk of deterioration of the information contained in the signals.
In case of information contained in the amplitude of the signals which is the case of data color signals (R,
G, B),image 8-25 , we are quite sure that the amplitude of these color signals is subject to alterations.
An example of alteration may be a DC component added to the signal, in the form of a DC offset reposi-
tioning the black level, since thisblack level(“brightness”) will become crucial later on (clamping circuit)
it will result in “black not being black”.
Another value that is subject to alteration is the amplitude of the signal, resulting in an altered “Gain” of
the signal (“white level”orcontrast).
The alterations of the three color signals will happen independently i.e. the colors will end to be unbal-
anced, image 8-26
B
Black level
0.7V
Image 8-25
Black level
ΔGΔΒ
ΔR
RG
B
Image 8-26
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							8. Configurator, Projector adjustment settings
One can conclude here that a good color tracking can only be met by using three previ-
ously (input) balanced color signals
Analog Digital Conversion
The analog color signals must pass through an Analog/Digital conversion circuit prior to any digital pro-
cessing in the PMP.
A typical ADC transforms the analog value into an 8 bit coded digital signal.
The graphic shows that when converting a signal containing a DC offset component the range of the
converter is not optimally used.
Black levelΔ
R
ADC
0 255i1 : superfluous information i2 : video information
Image 8-27
One can conclude here that a good data conversion can only be met by using three
previously (input) balanced color signals
The objective of input balancing
The objective in input balancing is to “set” the same black level and the same white level for the three
colors of a particular input source.
Black level setting : brightness
White level setting : contrast
The same absolute black and white level for the three colors allows the same reference for Brightness
and Contrast control of the picture !
These two references also set the range in which theADC will work for that particular source (this explains
also why each input balance setting is linked to a particular source and thus saved in the imagefile).
8.6.9.2 Adjusting the input balance
How can it be done ?
To balance the three color signals of a particular source there are conditions; in fact we must know the
black and the white level of the source i.e. :
1. The source in question must be able to generate a white signal, ideally a 100% white (background)
full screen pattern
2. The source in question must be able to generate a black signal, ideally a 100% black (background)
full screen pattern
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							8. Configurator, Projector adjustment settings
AB
Image 8-28
White balance : In the projector, we will set the contrast for each color until we get a 100% light output
picture when projecting a 100% white image (image A)
Black balance : In the projector, we will set the brightness for each color until we get a 0% light output
picture when projecting a 100% black image (image B).
The changeover from min to max is indicated by the apparition of bright spots also called
“digital noise”
An alternative to a full screen White/black pattern is the standard gray scale pattern, the
white bar will be used for white balance and the black bar for black balance.
Image 8-29
Black balance
1. Select a window and click onAdjust(a). (image 8-30)
The Input dialog box opens (b).
2. Click onInput balance(c).
A question dialog box is displayed (d). This box announces that special lookup tables are needed while
adjusting input balance. ClickYe sto load these tables. A second question window opens (f) to ask if
the 2 bit test pattern must be switched on.
3. If the pattern must be switched on, click Yes (g).
If no pattern must be switched on, click No.
When yes or no is clicked, the input balance adjustment window opens (h).
4. Adjust the red black level on a minimal value
5. Select Black balance blue and adjust the blue black level on a minimal value.
Note:This minimal value is not necessary , provided that the 2 other colors are not influencing too
much the color to be adjusted, in fact the aim is to minimize the effect of the two other colors
since there is a risk of reaching too soon the 50% transition due to the contribution of these two
other colors signals.
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							8. Configurator, Projector adjustment settings
6. Select Black balance green and adjust the Green black level until bright spots appear on the screen.
7. Select Black balance blue adjust the Blue black level until bright spots appear on the screen.
8. Select Black balance red adjust the Red black level until bright spots appear on the screen.
The projected image should now be noisy full black
Image 8-30
Input balance adjustment
Ifoneusesagrayscalepattern, the bright spots should appear in the black bar.
Performing White input balance
1. Connect the source you want toproject.
2. Select a white pattern (or gray scale as alternative) or use the suggested 2 bit pattern.
3. Adjust the red white level (gain) on a minimal value
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4. Select White balance blue and adjust the blue white level (gain) on a minimal value.
Note:This minimal value is not necessary , provided that the 2 other colors are not influencing too
much the color to be adjusted, in fact the aim is to minimize the effect of the two other colors
since there is a risk of reaching too soon the transition (bright spots) due to the contribution of
these two other colors signals.
5. Select White balance green and adjust the Green white level (gain) until bright spots appear on the
screen.
6. Select White balance blue adjust the Blue white level (gain) until bright spots appear on the screen.
7. Select White balance red adjust the Red white level (gain) until bright spots appear on the screen.
The projected image should now be noisy neutral gray.
8.6.10 Input color temperature
Projector white will provide maximum projector light output. The calibrated ’Broadcast
: 3200’, ’Film : 5400’, ’Video : 6500’ and ’Computer : 9300’ presets will provide optimum
color tracking.
Apredefined color temperature
1. Select a window and click onAdjust. (image 8-31)
TheInputdialog box opens.
2. Click onInput Color Temperature.
TheInput color temperaturedialog box opens. The content depends on the selection.
Color temperature on input Color temperature can be adjusted as desired for the selected input
Color temperature full
screenColor temperature is adjusted via the Color Space (gamut) in theColor
alignmenttab
3. SelectColor temperature on input. (image 8-32)
4. Click onChange...
The color temperature selection menu opens.
5. Select the desired value and clickOpen.
The chosen color temperature is applied to the input.
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							8. Configurator, Projector adjustment settings
Image 8-31
Color temperature
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