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ALICE
COLOR MANAGEMENT
Instruction Manual
As of: April 2003
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Table of Contents
Summary of Contents for ARRI Projection HDTV
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Page 1: Color Management
ALICE COLOR MANAGEMENT Instruction Manual As of: April 2003 LL ARTWORK PICTURES AND TEXTS ARE COVERED BY OUR COPY RIGHT CD-ROM HEY MUST NOT BE COPIED FOR REPRODUCTION DISKS OR NTERNET SITES OR USED IN THEIR ENTIRE FORM OR IN EXCERPTS WITHOUT OUR PREVIOUS WRITTEN AGREEMENT PDF- F YOU ARE DOWNLOADING FILES FROM OUR... -
Page 2: Table Of Contents
Contents Safety Instructions ... 3 ALICE ARRILASER Interactive Configuration Editor... 5 Operation... 7 Viewer area... 7 Timeline... 8 Projectable Area ... 9 Pixel Info... 9 Display Settings... 9 Configuration Area ... 11 Input Format... 11 Output Format... 12 Calibration ... 12 Crop Area... -
Page 3: Safety Instructions
Color Management for Video Look ... 28 Operation from ALICE ... 28 5.1.1 Configuration of CMS node in ALICE... 28 5.1.2 Soft clip Parameter ... 29 5.1.3 Display settings ... 30 Configuration... 32 5.2.1 Monitor Setup ... 32 Calibration of the HD class A reference monitor.. 32 5.2.2 Film Setup... -
Page 5: Alice
1 ALICE ARRILASER Interactive Configuration Editor The ALICE offers the fastest, easiest and safest way to generate a new image processing configuration file and gives visual control over the whole image process from the raw input sequence to the final images positioned on the film. - Page 6 viewer area • • projectable area • pixel info film view • processed view • • display settings original view • timeline • • home button • configuration area...
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Page 7: Operation
2 Operation To start ALICE click the ALICE Button beneath the image processing configuration list in the input tab of ALGUI. Any preselected image processing file will be applied in ALICE, as long as it is compatible with ALICE’s configuration. If not, or if no file is selected at all, ALICE will be opened with default settings. -
Page 8: Timeline
Timeline • To change the displayed frame range, enter the start/end frame in the corresponding text field at the beginning and end of the timeline The ‘cur‘ field shows photo frame number. Typing a particular number in that field will show this frame on the display. -
Page 9: Projectable Area
Projectable Area • By choosing an output format in the ‘projectable area‘ photo, internally the corresponding ‘projector mask’ is selected. The ‘projector mask‘, the ‘save title area’ or both together can be activated. Additionally the reserved region for the soundtrack and the frame line can be displayed. - Page 10 input format • ouput format • calibration • • crop area • CMS • Sharpen • Deinterlace...
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Page 11: Configuration Area
2.2 Configuration Area This chapter explains all available ALICE nodes and their parameters in a systematic way according to the standard GUI configuration. It is mainly intended as a reference. In this window a configuration file for the image processing can be build. Note: This configuration file works only together with the chosen geometry. -
Page 12: Output Format
Output Format • The determination of the ‘output format’ a two-stage selection procedure: First the desired projection aspect ratio must be choosen (i.e.: 1:2,35 CS means squeezed for projection with cinemascope lenses). All available geometries for this aspect ratio will appear in the second drop down list. -
Page 13: Crop Area
Crop Area • With the crop node a ‘crop area‘ photo specified by the x/y-size and the origin of the crop box in relation to the original image. By selecting a projection aspect ratio (e.g. 1.66) in the ‘output format’ node the maximum appropriate ‘crop area’ settings are adjusted automatically and, if necessary, the image is auto scaled to fit into the chosen ‘output format’. -
Page 14: Crop Box Handling With The Aspect Unlocked
Crop box handling with the aspect unlocked: If the image should not be cropped in order to get the selected output format the ´lock aspect´ button can be switched off. This mode allows to only downsize the aspect ratio starting from the chosen ratio in the ‘output format’... -
Page 15: Right Mouse Button
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. -
Page 16: Deinterlace
Deinterlace The ‘deinterlace‘ node enables the merging photo of two fields of video originated frames. There are no arguments required. • For quick comparison between ‘deinterlace’ on/off toggle key D in the processed view mode. Pushing down the key will disable the effect on the image and the color of the icon will change to black &... -
Page 17: Cms
The Color Management system (‘CMS‘ is used to apply high quality profiles for standard devices such as Sony HD Monitor and Kodak Vision print stock projected by a xenon lamp in order to bring the colors of the film output close to what can be seen on the monitor. •... -
Page 18: The File Menu
3 The File Menu ‘Preferences’ has three tabs: • Appearance: to adjust the background, perforation, film, soundtrack and frame line color in the film view. Transparency of soundtrack and frame line can also be adjusted. The general ALICE font can be changed as well. - Page 19 • ‘Select sequence’: The file browser opens and the sequence can be selected in the display. This change will also be returned to the ALGUI, if ALICE is left with saving. • ‘Save configuration as…’ will open the file menu. The actual image processing configuration can be saved without leaving ALICE.
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Page 20: Configuration
4 Configuration 4.1 Naming Conventions in ALICE On startup, ALICE analyzes all configuration files, directories and environment variables relevant for recording. In addition to the information stored in the files, there are some conventions for naming files. These are relevant for ALICE only: Cinemascope geometries Geometry files with “CS”... -
Page 21: Inter Positive Fullap Geometries
Inter Positive fullap geometries Geometry files named ‘ipfullap*.cfg‘ are used as fullap geometries for intermed positive recording. For each supported pitch there must be one (and not more than one) ip fullap geometry file. ALICE is installed with ip fullap geometries for all supported pitches. Example: Format: 2Kipfullap... -
Page 22: Input Format File Specification
4.2 Input Format File Specification Location of input format file The fully qualified path and filename of the input format file is specified in the environment variable ALICE_ INPUT_FORMAT_FILE. The suggested location is ‘c:\al\alice\config\aliceInputFormats.cfg‘. Syntax of input format file The syntax of the input format configuration file follows the general syntax of ARRILASER configuration files, as for example the film format file. - Page 23 ################################################ # ARRILASER ALICE Input Format Configuration File # ARRI Film & TV ################################################ # examples of entries for images scanned from # cinemascope film, thus having a pixel aspect # of 1:2 : imageformat: 2k_cinemascope xSize : 2048 ySize : 1556 pixelAspect : 0.5...
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Page 24: Fine-Tuning Alice
4.3 Fine-tuning ALICE Memory Footprint The amount of memory ALICE consumes depends on the maximum image size to be processed, and the maximum size of its internal image cache. The image cache limit can be influenced by the environment variable ALICE_MEM_FRACTION. Its value is the percentage of the memory marked available to the application by the operating system. -
Page 25: Accessing Dvs Disk Recorders
4.4 Accessing DVS Disk Recorders Together with ALICE comes the possibility to directly access DVS HDTV and SDTV disc recorders. Direct access to disc recorders is also possible via the command line interface (CLIF). The direct frame access uses the DVS API, and does not need the DVS virtual file system to be installed. -
Page 26: Network Timeouts
4.4.2 Network Timeouts Whenever browsing file servers or disc recorders with the ‘Open Sequence‘ dialog in ALICE, or the ‘Browse” dialog in the ALGUI, waiting for inactive servers can be annoying. Therefore timeouts can be adjusted in the network tab of the preferences panel of ... -
Page 27: Command Line Interface Syntax
4.4.4 Command Line Interface Syntax Frames on a disc recorder can be accessed by the alexpose command as files, using the protocol-like filename convention: ‘dr://<host name>/<partition name>/<clip name>/<frame number>‘ e.g. ‘dr://mydiscrecorder/PART1/testclip/42‘ means frame 42 within the clip testclip. Frame enumerations starts with frame 0. Omitting the clip name addresses the complete partition, e.g. -
Page 28: Color Management For Video Look
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‘. -
Page 29: Soft Clip Parameter
5.1.2 Soft clip Parameter As the color gamuts of film and monitor are different, not all colors that are visible on the monitor can be reproduced on film. In order not to lose too much detail in those areas, it is required that either the lightness or the chromaticity of these areas is reduced. -
Page 30: Display Settings
5.1.3 Display settings Proof: Since the color profiles directly generate cineon data, judging the effect of the Color Management on the screen can be difficult. Therefore, the proof mode allows for simulating the appearance of the recorded image on the workstation monitor. •... - Page 31 in which those areas are indicated can be choosen (preferable a color which is not so present in the images) and how to show the distance of those colors to the gamut. fixed color: All out-of-gamut pixels are drawn with the out-of-gamut color selected in preferences.
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Page 32: Configuration
5.2 Configuration 5.2.1 Monitor Setup Calibration of the HD class A reference monitor The HD Monitor that has been used for the color timing shall be calibrated according to the following guidelines: • The color temperature shall be 6500K • 100% white shall be at a luminance of 80 cd/m •... -
Page 33: Color Management Node
5.2.3 Color Management Node The Color Management node is part of the ARRILASER image processing system. It allows the use of all features of the Color Management through its scripting interface. Please refer to chapter 5.5, Image Processing Software Engine of the ARRILASER manual for detailed description of the image processing itself. -
Page 34: Node Type Identifier And Node Arguments
Node type identifier and node arguments The Color Management node is identified by the keyword ‘CMS’. Argument Type Default monitor profile string recorder profile string soft clip string intent string Example: # example configuration file showing # the use of the Color Management node # with default settings, as used in ALICE Description node: CMS... -
Page 35: Soft Clip Configuration File
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 syntax of ARRILASER configuration files, as for example the film format file. - Page 36 For each entry in the soft clip configuration file, the following parameters are valid: soft clip name of the setting, used as value of soft clip parameter of the CMS node. Example: “mysoftclip”. luminance difference, used for each color if not specified color specific chroma difference, used for each color if not specified color specific dL.R luminance difference for red...
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Page 37: Soft Clip Parameters Demystified
Soft clip parameters demystified Gamut compression can be achieved in general by reducing the chroma of colors, thus moving colors slightly towards the gray axis. In the case of recording CRT monitor images to film, due to the fact that film gamut reaches its maximum chroma at lower levels of lightness than the monitor gamut, carefully reducing lightness also moves colors into the film gamut. - Page 38 © 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...