The beam guiding enables to achieve astrometric error less than $50\,\mu$as. The guiding stabilizes light injection into single-mode fibres, increasing sensitivity and reducing the astrometric and image reconstruction errors. The Shack-Hartmann measured quasi-static aberrations are used to focus the Auxiliary Telescopes and allow the possibility of correcting the non-common path errors between the Unit Telescopes adaptive optics systems and GRAVITY. These measurements enable active field and pupil guiding by actuating a train of tip-tilt mirrors placed in the pupil and field planes, respectively. The telescope pupils are imaged for a visual monitoring while observing. For each telescope beam it measures: a) field tip-tilts by imaging stars in the sky b) telescope pupil shifts by imaging pupil reference laser beacons installed on each telescope using a $2 \times 2$ lenslet c) higher order aberrations using a $9 \times 9$ Shack-Hartmann. A multiple beam acquisition and guiding camera was built to meet these challenges for a recently commissioned four beam combiner instrument, GRAVITY, at the ESO Very Large Telescope Interferometer. They limit the performance of a fibre-fed interferometer by degrading the instrument sensitivity and astrometric measurements precision and by introducing image reconstruction errors due to inaccurate phases. 1-5 or 6-3.Atmospheric turbulence and precise measurement of the astrometric baseline vector between any two telescopes are two major challenges in implementing phase referenced interferometric astrometry and imaging. Here are the rules for building input ranges: For instance cpdf in.pdf 2-5 out.pdfĮxtracts pages two, three, four and five from in.pdf, writing the result to out.pdf, assuming that in.pdf contains at least five pages. This is treated differently by each operation. 1Īn input range may be specified after each input file.
If the names of the files are numeric, leading zeroes will be required for the order to be correct (e.g 001.pdf, 002.pdf etc). The files in the directory myfiles are considered in alphabetical order. For example: cpdf -i in -o out.pdfĪ whole directory of files may be added (where a command supports multiple files) by using the -idir option: cpdf -merge -idir myfiles -o out.pdf If an input file does not contain a period, it should be preceded by -i. Of course, we should like to do more interesting things to the PDF file than that! Files on the command line are distinguished from other input by their containing a period. The input and output may be the same file.
#Coherent pdf command line tools manual#
The rest of this manual describes the options that may be given to this program.Īnd the simplest concrete example, assuming the existence of a file in.pdf is: cpdf in.pdf -o out.pdf There is a single command-line program cpdf (cpdf.exe under Microsoft Windows). Under Microsoft Windows, type cpdf.exe instead of cpdf.īasic Usage The Coherent PDF tools provide a wide range of facilities for modifying PDF files created by other means. An exception is that we use in.pdf and out.pdf instead of and to reduce verbosity. For example, cpdf in.pdf -o out.pdfĭescribes a command line which requires an operation and, optionally, a range. When describing the general form of a command, rather than a particular example, square brackets are used to enclose optional parts, and angled braces to enclose general descriptions which may be substituted for particular instances. Typographical Conventions Command lines to be typed are shown in typewriter font in a box. 15.2 Blackening Text, Lines and Fills 15.3 Hairline Removal. 52 15 Miscellaneous 15.1 Draft Documents. ġ3 Working with Images 49 13.1 Detecting Low-resolution Images. ġ2 File Attachments 12.1 Adding Attachments. 38 11 Document Information and Metadata 11.1 Listing Fonts. 35ġ0 Annotations 37 10.1 List Annotations.
8.2.2 Date and Time Formats 8.2.3 Bates Numbers. Watermarks and Stamps 8.1 Add a Watermark or Logo. Ĭompression 21 5.1 Decompressing a Document. 3.6 Boxes and CroppingĮncryption and Decryption 4.1 Introduction. 2.4 Encrypting with Split and Split Bookmarks 1.5 Doing several things at once with AND 1.6 Units. Windows, Powerpoint and Excel are registered trademarks of Microsoft Corporation.īasic Usage 1.1 Input and Output Files. Adobe, Acrobat, Adobe PDF, Adobe Reader and PostScript are registered trademarks of Adobe Systems Incorporated. Coherent PDF Command Line Toolkit User Manual Version 2.1 (November 2014)įor bug reports, feature requests and comments, email Ģ014 Coherent Graphics Limited.
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