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5 Color Management for Video Look

5.1 Operation from ALICE

5.1.1 Configuration of CMS node in ALICE

• Choose monitor profile ‘

sony_hd

‘ from the list

beside M

• Choose print film profile vision from the list beside P

• Choose soft clip parameter from the list beside clip

If you have your own ICC profiles, copy them into the

folder ‘

c:\al\ipconfig\icc

‘. After restarting ALICE

they will appear in the profile selection list beside M

and P.

Color Management

5.

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Содержание Projection HDTV

Страница 1: ...N E G ON CD ROM DISKS OR INTERNET SITES OR USED IN THEIR ENTIRE FORM OR IN EXCERPTS WITHOUT OUR PREVIOUS WRITTEN AGREEMENT IF YOU ARE DOWNLOADING PDF FILES FROM OUR INTERNET HOME PAGE FOR YOUR PERSONAL USE MAKE SURE TO CHECK FOR UPDATED VERSIONS WE CANNOT TAKE ANY LIABILITY WHATSOEVER FOR DOWNLOADED FILES AS TECHNICAL DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE ...

Страница 2: ... 14 Right mouse button 15 Deinterlace 16 Sharpen 16 CMS 17 3 The File Menu 18 4 Configuration 20 4 1 Naming Conventions in ALICE 20 Cinemascope geometries 20 Inter Positive fullap geometries 21 Loader LUTs for Color Management 21 4 2 Input Format File Specification 22 Location of input format file 22 Syntax of input format file 22 4 3 Fine tuning ALICE 24 Memory Footprint 24 Multi Threading 24 4 4...

Страница 3: ...on of CMS node in ALICE 28 5 1 2 Soft clip Parameter 29 5 1 3 Display settings 30 5 2 Configuration 32 5 2 1 Monitor Setup 32 Calibration of the HD class A reference monitor 32 5 2 2 Film Setup 32 5 2 3 Color Management Node 33 The CMS node syntax 33 Node type identifier and node arguments 34 5 2 4 Soft clip Configuration File 35 Location of soft clip configuration file 35 Syntax of soft clip conf...

Страница 4: ...4 Introduction 1 ...

Страница 5: ... The purpose of ALICE is to judge the quality of the input images to select the frame range visually to build a job and select appropriate job settings with visual control of the final rendered images positioned on the film By choosing an ICC profile for the workstation monitor the effect on the actual output on film can be previewed This is especially helpful in transferring colors that lie outsi...

Страница 6: ...6 film view processed view original view timeline projectable area home button viewer area configuration area pixel info display settings Operation 2 ...

Страница 7: ... area photo 2 1 Viewer area The viewer area includes the viewer window timeline projectable area pixel info and display settings It offers a visual control of the raw input sequence and is used to create interactively the configuration parameters A preview shows the actual position of the final images on the film The original view shows the original raw input images The processed view accurately d...

Страница 8: ...e timeline using the arrow keys on your keyboard To skip frames change the inc value numerically or by choosing the predefined values in the drop down list To reset the displayed frame range click on the home button at the right end of the timeline This will refresh the images and reset the frame range Additional keyboard shortcuts can be used Arrow left right retreat advance a step based on the f...

Страница 9: ...o the recorder Those values will change by changing the loader LUT Display Settings Choose a zoom factor from the drop down list in the display settings area photo to zoom in out 25 200 or use the right mouse button or keyboard shortcuts Right mouse button zoom in out fit 100 the mouse pointer must be positioned in the viewer window Keyboard shortcuts ctrl numerical keypad ctrl F Fit ctrl 0 100 Be...

Страница 10: ...10 input format ouput format calibration crop area CMS Sharpen Deinterlace Operation 2 2 ...

Страница 11: ...spect ratio of the selected sequence are displayed By default images of the size 1920x1080 are auto matically recognized as HDTV 1080 pixel aspect 1 0 of 1280x720 as HDTV 1280 pixel aspect 1 0 of 720x486 as NTSC pixel aspect 0 9385 and images of the size 720x576 are recognized as either PAL pixel aspect 1 067 or PAL Plus pixel aspect 1 416 The right choice for PAL or PAL Plus must be selected by t...

Страница 12: ...w geometries in the list Note Changing the output format will reset the crop area to the maximum appropriate settings to fit into the new output format Calibration Select the actual calibration photo and loader LUT photo for the used film stock and lab and the format conversion look up table LUT The LUT converts the given files into the Cineon format Choose 10log if the files are already in the Ci...

Страница 13: ...matically and if necessary the image is auto scaled to fit into the chosen output format By default the x size of the crop box is set to maximum input image width and the image height is selected according to the aspect ratio Crop box handling with the aspect locked CTRL drag the center move the crop box ALT drag the border vary the size fixed to its center Drag a corner vary the size fixed to the...

Страница 14: ...e result is a horizontally centered image with a letterbox on both sides Check in the film view for the look The projectable image height remains constant according to the chosen projection aspect ratio To enlarge the aspect ratio e g 1 66 to 1 85 means to decrease the projectable image height To do so change the projection aspect ratio in the output node Drag a side vary the size fixed to the opp...

Страница 15: ...15 Right mouse button To reset the crop box to its default to maximize or center the crop box use the right mouse button when the mouse is located in the image area Operation 2 2 ...

Страница 16: ...ocess on the image The details of the sharpening process are determined either by choosing a predefined kernel file and following the description of the convolution node see chapter 5 5 2 4 of the ARRILASER manual or by choosing variable and using the unsharp masking as described in chapter 4 of the Release Notes CLIF 3 5 ALGUI 3 44 In this case a filter size and strength must be choosen Filter st...

Страница 17: ...d For images with high saturated colors the soft clip can be adjusted by choosing one of the prepared soft clip settings from the list See chapter 5 Color Management for Video look for more detailed information on the Color Management To judge the CMS settings switch the proof button on For quick comparison between CMS on off toggle key C Note This node is key protected and only available when the...

Страница 18: ...profile for your workstation monitor can be selected here It is necessary to make a selection in order to use the proof button Settings for the out of gamut display can also be modified in this dialog see chapter Color Management for Video look for more detailed information Network Available DVS hard disk recorders as well as appropriate network timeouts can be determined in this dialog see chapte...

Страница 19: ...to save the job Save view as is used to save the current view as a JPEG image 8bit uncompressed or compressed with overlays if activated or a TIFF image 8 or 16 bit without overlays Overlays are the projector mask and the save title area Note JPEG image saves the view as displayed with a size according to the present magnification factor TIFF images are always saved in the true image size regardle...

Страница 20: ...re are some conventions for naming files These are relevant for ALICE only Cinemascope geometries Geometry files with CS in capital letters in their file name are assumed to define cinemascope geometries thus causing the recorded image to be warped for anamorphic projection Example Format CS_2K1828x1556 xSize 1828 ySize 1556 xOffset 220 yOffset 0 xOrigin 1797 yOrigin 2514 pitch 1200 0 pullDown 189...

Страница 21: ... cineon code values prior to recording Since the cineon conversion is built in the ICC profiles used for the Color Management Color Management will fail if incorrect loader LUTs are selected Therefore ALICE automatically selects the appropriate loader LUT if Color Management is turned on They are distinguished from other loader LUTs by starting their name with CMS If there is more than one CMS LUT...

Страница 22: ... syntax of ARRILASER configuration files as for example the film format file Each entry defines a valid input format that is a pixel aspect pixel width pixel height associated with an image size Whenever images of this size are selected ALICE displays a choice of pixel aspects denoted by names in the Input Format drop down list Instead of giving image width of height in pixels the keyword any deno...

Страница 23: ...xels imageformat PAL_square xSize 720 ySize 576 pixelAspect 1 0 ALICE uses the following internal rules to determine the list of input formats It internally maintains a list of input formats consisting of the entries of the user defined file followed by predefined HD and SD formats For any given input image each format matching the size of the image is displayed in the input format panel If no for...

Страница 24: ...ti Threading Besides running parallel to image loading and recording the image processing can operate multi threaded to make optimal use of the dual CPU system When running ALICE at the same time as recording on the same host computer multi threading can be switched off by setting ALIP_THREADS to 0 This affects both ALICE as well as image processing for recording Setting ALIP_THREADS to 1 turns on...

Страница 25: ...es are seen by the ARRILASER software as 16 bit RGB images They also require 16 bit LUTs for recording regardless of being stored as 8 or 10 bit YUV on the disc recorder Also YUV data exported from the disc recorder as YUV16 can be read if given the file extension yuv16 4 4 1 Browsing Disc Recorders To make disc recorders visible in the sequence dialog panels define their host names or ip addresse...

Страница 26: ...sc recorder both by ALICE and CLIF Therefore it does not affect recording 4 4 3 Partition Change Policy On DVS disc recorders frames of different sizes are stored in different partitions Only one partition can be active at a time and only frames on active partitions can be accessed Since changing the active partition will prevent all other applications and real time operations to be stopped the AR...

Страница 27: ...clip testclip Frame enumerations starts with frame 0 Omitting the clip name addresses the complete partition e g dr mydiscrecorder PART1 500 Note This is a name convention built in the CLIF and ALGUI software not a protocol Therefore no extra drives have to be installed to use this feature Although the DVS software allows the creation of partition and clip names containing or these will not work T...

Страница 28: ...le sony_hd from the list beside M Choose print film profile vision from the list beside P Choose soft clip parameter from the list beside clip If you have your own ICC profiles copy them into the folder c al ipconfig icc After restarting ALICE they will appear in the profile selection list beside M and P Color Management 5 ...

Страница 29: ...these areas is reduced In the list of soft clips a preselection of recommended soft clips can be found As using a soft clip will not only affect the out of gamut colors but also the colors that are just within the gamut the lowest possible soft clip should be taken The strength of the softclip is dictated by the out of gamut colors in the sequence to record For judging the softclip use the proof a...

Страница 30: ... clipping out of gamut colors easily by using the C toggle key Go to file preferences Color Management Choose workstation profile sony_hd icm There it can be judged if the loss of resolution in those areas is acceptable or not If not a soft clip can be applied Using a soft clip it is recognizable that more colors are different to the original but at the same time more detail can be achieved in bac...

Страница 31: ...f gamut color selected in preferences The mixing ratio depends on the distance of the color to the gamut so that colors being far outside the film gamut finally are displayed in the out of gamut color only color distance mask In gamut pixels are displayed as gray while out of gamut pixels are blended between the gray and the original color The more saturated a color appears in this view the more i...

Страница 32: ...lowing two test images are needed for the calibration procedure calibration image luminance Y U V 20 gray 2 2 cd m2 240 512 512 100 white 80 cd m2 940 512 512 Note We recommend the use of a high quality color calibration sensor e g a Philips PM 5639 5 2 2 Film Setup The vision print film profile is established under the following circumstances Recorded on Kodak 5242 intermediate film stock Recorde...

Страница 33: ...ode creates a 3D lookup table from the ICC profile specified as monitor and recorder profile The monitor profile is taken as input profile the recorder profile as output profile An optional gamut compression can be activated by specifying one of the presets defined in the soft clip configuration file Also the rendering intent can be influenced by specifying either absolute relative perceptual or s...

Страница 34: ... string soft clip parameters to be used optional intent string rendering intent to be used optional Example example configuration file showing the use of the Color Management node with default settings as used in ALICE node CMS monitorprofile hdmonitor icm recorderprofile arrilaser icm example configuration file showing the use of the Color Management node with soft clip node CMS monitorprofile hd...

Страница 35: ...ation file The fully qualified path and filename of the soft clip configuration file has to be specified in the environment variable ALIP_SOFTCLIP_FILE set under c cshell login csh and consistently in the ALGUI startup file Arri txt The default location is c al ipconfig icc alsoftclip cfg Syntax of soft clip configuration file The syntax of the soft clip configuration file follows the general synt...

Страница 36: ...rence for green dL B luminance difference for blue dL C luminance difference for cyan dL M luminance difference for magenta dL Y luminance difference for yellow dC R chroma difference for red dC G chroma difference for green dC B chroma difference for blue dC C chroma difference for cyan dC M chroma difference for magenta dC Y chroma difference for yellow The color specific settings dL R etc alway...

Страница 37: ...ilm gamut respectively Both chroma and lightness change depending on hue chroma and lightness so that dark and unsaturated colors are affected less than bright highly saturated colors For colors at which the film chroma is greater than the monitor chroma the chroma difference should be 0 or negative to gain gamut compression otherwise gamut extension would be the effect This is especially true for...

Страница 38: ...technical data are subject to change without notice ARRI 2003 available languages English ARNOLD RICHTER CINETECHNIK Türkenstraße 89 D 80799 München Phone 49 089 3809 0 Fax 49 089 3809 1244 www arri com ...

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