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Chromakey Workflow - Green Screen

MBS Remote User Manual.pdf 55

2014/6/13 PM 02:23:52

Содержание Vmatte-HD HDL4.2

Страница 1: ...Vmatte HD Chroma Keyer Operation Manual Version HDL4 2...

Страница 2: ...nel Support 6 Video Processing 6 1 Input 6 2 PreAmp 6 3 Chromakey 6 3 1 Matte Generation 6 3 2 Spill Suppression 6 3 3 Edge Fix 6 3 4 Dark Bright and Shadow 6 4 External Matte 6 4 1 External Matte 6 4...

Страница 3: ...SDI video sources to INPUTS connectors At least two inputs a foreground and a background are required to create a chromakey result 3 Connect video monitors or recording devices to output SDI or YUV c...

Страница 4: ...equired to produce a chromakey result These controls are located in Input Chromakey and Config tabs The new ExtMatte Composite tab is only available for firmware version 4 2 and above The MBS Remote a...

Страница 5: ...omaKey Adjust color brightness and white balance for processed foreground PostAmp Clean up or preserve part of the foreground in the final composite Window Switch one video scene to another Fade Open...

Страница 6: ...is necessary Suppress Spill The three default spill suppression settings low mid high are suitable for most cases The default Spill Low preserves foreground colors that are close to the Back Color To...

Страница 7: ...ng PC remote control and recall actions GPI Lights up for 1 second when GPI action takes place All three LEDs light up during the power on process which lasts about 10 seconds At the end of the power...

Страница 8: ...s a background a DVD player to INPUT4 as an external matte A USB RS232 adapter that can be used in Mircosoft Windows 2000 XP Vista 7 for either 32 or 64 bit OS is shipped along with the Vmatte chromak...

Страница 9: ...Block Diagram Chromakey Dual ExtMatte Graphics Layer Chromakey Dual ExtMatte Dual FG 7...

Страница 10: ...lowings are the minimum system requirements Operating System Windows 2000 Windows XP Vista 7 8 Hardware RS232 Serial Port 600MHz Pentium class processor 64MB RAM 5MB free drive space 1024 x 768 16 bit...

Страница 11: ...older version before the upgrade User settings are preserved during software installation as long as the file MBS_Remote ini is not removed from the MBS Remote folder MBS Remote MBS Remote 2 MBS Remo...

Страница 12: ...About MBS Remote Hardware model channel and hardware firmware software version information can be found in the About window To view the About window click Menu Help About 10...

Страница 13: ...take two simultaneous foreground inputs and perform real time switch between these two foregrounds when either the background or the external matte is not used Advance Operations Besides the standard...

Страница 14: ...BS Remote software reloads the settings saved in MBS_Remote ini Recall Parameters Use either one of the following methods to recall pre stored parameters Click on one of the recall button at the end o...

Страница 15: ...enable this feature Once enabled Switch to Camera 1 4 will appear in the Option menu In addition to the menu a CameraUnit Switch box with four buttons appears on the upper right corner of MBS Remote...

Страница 16: ...s Enable Multi Channel Click Menu Option Enable Multi Channel Support to turn on the multi channel feature After a port is opened set number of channels corresponding COM port and sync operation Once...

Страница 17: ...y modes to create various composition effects The status of the current key modes are displayed next to the ExtMatte1 and the ExtMatte2 texts In the following picture the ExtMatte1 is in the Cutoff ke...

Страница 18: ...processed Refer to External Matte for detailed descriptions on settings and applications In the Input Source panel the two external matte inputs can be selected independently In order to view either...

Страница 19: ...nstead of FG PreAmp On the other hand BG PreAmp can be used independently of the chromakey Default Clicking the Default button changes all adjustment controls to their default values which are set to...

Страница 20: ...n the three text boxes Click on the square color button and choose a color when a dialog appears Click on the Pick button to choose a color from the foreground when a dialog appears This usually produ...

Страница 21: ...e chiffon shadow etc and over spilled foreground objects reflective materials shall be inside the open angles but relatively far away from the Back Color Recovering Semi Transparent Objects If a foreg...

Страница 22: ...e more backing areas or decrease this value to preserve foreground details In the latter case the foreground details may contain too much spills from the Back Color Spill Suppression controls should b...

Страница 23: ...n Blue jeans a little transparent Blue jeans opaque Example Increase opacity for semi transparent objects Foreground Matte Matte Density 1 0 Matte Matte Density 0 8 Right side of the umbrella is more...

Страница 24: ...jects that are subject to spill suppression shall be opaque or semi opaque at the output If not decrease Open angle or Matte Density so that these objects become more opaque Refer to the Matte Generat...

Страница 25: ...e same brightness as the Back Color The MBS Remote software automatically sets this color when the Auto button in the Pick Back Color dialog is pressed There is no need to adjust this color except for...

Страница 26: ...ce and hair are affected by the Back Color Example Brightness enhancement with the spill enhance control Composite Glass has correct transparency but looks a bit dull Light reflection shadow and glass...

Страница 27: ...either warm or cold colors but not both usually in situations when unequal amounts of spills need to be removed from warm and cold colors The Spill Suppression should be used to remove most of the spi...

Страница 28: ...ince the foreground scene has green leaves in front of a green screen Spill Suppression should remain at its default value 1 0 and therefore cannot be used to remove the green spill By adjusting the S...

Страница 29: ...ing 0 7 pixels horizontally Example Removing foreground edges with matte soft Composite Matte Soft off Composite Matte Soft on Matte magnified Matte Soft 0 white edge on clothes Matte Soft 20 white ed...

Страница 30: ...Composite Shrink 0 0 Composite Shrink 2 0 Black edge on the left Edge removed 28...

Страница 31: ...these three controls are smaller control larger Clean dark objects Dark Level Restore dark objects Narrow down precise areas Dark Density Smooth transition between dark and back color Clean medium dar...

Страница 32: ...grids Foreground Matte Semi transparent bottle Disable Bright Bottle unclear and blurry Increase Bright Level bottle visible grids appearing Decrease Bright Density Grids removed Example C Creating a...

Страница 33: ...even after the Shadow control has reached its maximum value choose a darker Replace Color to achieve this effect However this operation has side effects on all semi transparent objects and should be...

Страница 34: ...orrect key mode The following table provides a reference for common usages of the key modes Key Mode Usages Cutoff Remove unwanted FG objects Bring part of BG on top of FG Extend backdrop region unlim...

Страница 35: ...below Left Click on Matte Generation Cutoff Area Matte On in the Chromakey feature tab Right Click on Composite Matte Combine Cutoff Area Matte On in the ExtMatte Composite feature tab Enable the Lay...

Страница 36: ...similar to cutting out part of the foreground in order to show the underneath background If Graphics Layer FG is selected part of the background cuts through both layers and shows as the top layer Whe...

Страница 37: ...00 Front Graphics Layer Fade 0 00 Show Chromakey graphics layer between FG and BG Graphics Layer Position 1 00 Rear Graphics Layer Fade 0 00 Show FG graphics layer no chromakey Cutoff Area Matte On wi...

Страница 38: ...created and sent to the chroma keyer along with the background The top layer portion should be white while the rest of the background be black in the external matte An additional graphics layer input...

Страница 39: ...te to remove a celling light on the top right corner of the shot The same task can also be accomplished using a built in Window function Example Removing unwanted foreground objects with the cutoff ma...

Страница 40: ...colors to the blue green screen color The following foreground example shows a green screen in the middle and a large glass with scenery on the right side Without using the Area Matte the trees lose g...

Страница 41: ...in the blue green screen region If the area matte is not blurred the color spills will show up in the final composite first row below With a blurred area matte the color out of area color spills can b...

Страница 42: ...phics layer controls located in the ExtMatte Composite tab Their usages are described in the Composite Control section This section illustrates examples for each of these controls Layer Position Examp...

Страница 43: ...justing graphics layer s transparency Composite FG BG Layer Matte Composite Graphics FG BG Chromakey result Input with the default level 1 00 Transparent graphics layer Level 1 20 More opaque graphics...

Страница 44: ...t the lamps is produced Example Applying both the cutoff matte and the area matte Foreground External Matte Composite Lamps in the foreground ExtMatte2 as the area matte Correct chromakey region set E...

Страница 45: ...ayer The graphics layer may be on top of or underneath the foreground In this usage case all graphics layer controls are freely adjustable and independent of the cutoff matte settings Example A Applyi...

Страница 46: ...round Background External Matte Composite Foreground ExtMatte2 as the layer matte News ticker behind graphics News ticker with the background ExtMatte1 as the cutoff matte News ticker on top of graphi...

Страница 47: ...e Black Level change the brightest darkest luma Saturation Hue adjust saturation and hue Cb Cr Offset adjust YUV s white balance The Black Balance shall always be adjusted before the White Balance Bot...

Страница 48: ...blur amount according to the camera s focus parameter so that a dynamic defocusing effect can be accomplished The BG Defocus controls are located in the PostAmp feature tab The two BG Defocus paramet...

Страница 49: ...ons Window Expansion The Window Expansion settings are used to soften the window edges For the unlimited blue box first application shown below soft window edges will allow gradual transition from a c...

Страница 50: ...e the foreground picture shown below applying chromakey to the entire camera view may cause color distortion to foreground objects that have similar colors to the blue green screen color The area matt...

Страница 51: ...se the blue green screen color leaking outside the backdrop area To remove these blue green spills adjust the four expansion settings until the soft window edges cover the spilled area Example Cleanin...

Страница 52: ...e accomplished by moving the T Bar from one end to another The MBS Remote software also provides an AutoRun feature for performing the fade action smoothly in a preset time interval In addition to the...

Страница 53: ...d 3 Dither transition from one scene to another cuurently not available for firmware version 2 5 4 Horizontal wipe for comparing foreground and the composite result 5 Vertical wipe with the Soft on 6...

Страница 54: ...recording or broadcasting final composite result Therefore it does not show cursor window or fade result OutputC is an additional output to facilitate individual studio requirements Lock Lock is used...

Страница 55: ...Vmatte HD Workflow The following flow chart is for Vmatte HD 4 2 but can also be used as a reference for other Vmatte chroma keyers 53...

Страница 56: ...Chromakey Workflow Blue Screen 54...

Страница 57: ...Chromakey Workflow Green Screen 55...

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