ARRI Projection HDTV Instruction Manual

Text of ARRI Projection HDTV User Guide:

• ARRI Projection HDTV, 12 Output Format • The determination of the ‘output format’  photo is 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. The pixel resolution and the pitch size provides additional information about the chosen output geometry. A crop box with the appropriate aspect ratio will appea

• ARRI Projection HDTV, 27 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. ‘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 creati

• ARRI Projection HDTV, 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. blend to fix color: The color of all out-of-gamut pixels is smoothly blended with the out-of-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

• 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

• ARRI Projection HDTV, 30 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. • To use the proof-mode, an ICC profile for the monitor has to be selected in preferences. Color Management 5.1.3. Note: It is also handy to select the HDTV monitor as workstation monitor, regardless of the fact that it is not a HD monitor, since this di

• ARRI Projection HDTV, 22 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. Each entry defines a valid input format that is a pixel aspect

• ARRI Projection HDTV, 23 ################################################ # ARRILASER ALICE Input Format Conguration File # # ARRI Film & TV # ################################################ # examples of entries for images scanned from # cinemascope lm, thus having a pixel aspect # of 1:2 : imageformat: 2k_cinemascope xSize : 2048 ySize : 1556 pixelAspect : 0.5 imageformat: generic_cinemascope xSize : any ySize : any pixelAspect : 0.5 # PAL size image, but with square # pixels imageformat: PAL_square xSize : 720 ySize

• ARRI Projection HDTV, 32 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 2 . • 20% gray shall be at a luminance of 2.2 cd/m 2 The following two test images are needed for the calibration procedure: calibration image luminance Y U V 20% gray 2.2 cd/ m 2

• ARRI Projection HDTV, 13 Crop Area • With the crop node a ‘crop area‘  photo can be 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’. 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 c

• 5 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. General input parameters like start/end frame, calibration and loader-LUT can also be specifie

• ARRI Projection HDTV, 20 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” (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: Form

• 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. • ‘Save job as…’ will save the actual job (including

• ARRI Projection HDTV, 35 5.2.4 Soft clip Configuration File Colors outside the recorder gamut cannot be recorded without changes, since they do not exist on film. By default, these colors are hard clipped into the recorder gamut. To smoothly clip these colors, a compression of the monitor gamut has to be done. The strength of the compression can be controlled by the parameters given in the soft clip configuration file. This chapter explains the syntax and use of this file. Location of soft clip configuration file The fully qualified path and filename of the soft clip configuration file has to be specified i

• ARRI Projection HDTV, 25 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. Frames are accessed as raw YUV data, and converted to RGB by the ARRILASER software. The conversion follows the DVS SMPTE274cgr matrices, thus converting the video save range into full 16 bit range. Since the conversion is done at a very early processing stage, the images are seen by the ARRILASER software as 16 bit RGB images. They also require 16 bit

• 11 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. See chapter 5.5, Image Pro

• ARRI Projection HDTV, 33 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. The CMS node syntax The CMS node 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 a

• ARRI Projection HDTV, 24 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. Default is 0.25, meaning that a quarter of the memory is the upper limit of the image cache. Note that this is the image cache only, not the total memory footprint of the application. The environment variable

• ARRI Projection HDTV, 28 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.

• ARRI Projection HDTV, 26 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  photo of the preferences panel of ALICE. When accessing a DVS disc recorder, the check if the recorder is reachable is done by sending a ping request to its host. A value of 0 disables checking, connections to unreachable disc recorders will then timeout by the DVS defaults. The timeout is ignored whenever loading images from the disc recorder, both by ALICE and CLIF. Therefore

• ARRI Projection HDTV, 14 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  photo can be switched off. This mode allows to only downsize the aspect ratio starting from the chosen ratio in the ‘output format’ node. The 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

• ARRI Projection HDTV, 7 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. Geometry, loader LUT and calibration can be preselected before opening the ALICE window or inside the ALICE window. If a chosen setting is not compatible with the ALICE configuration

• ARRI Projection HDTV, 29 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. 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 and th

• ARRI Projection HDTV, 17 CMS The Color Management system (‘CMS‘  photo) node 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. • In the ‘CMS‘ node a monitor profile (M) and a print film profile (P) is selected. 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 Co

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