Extension:PagedTiffHandler/pl

Podręcznik rozszerzeń MediaWiki

PagedTiffHandler Status wydania: stabilne
Realizacja	Media
Opis	Allows to display tiff-files
Autor(zy)	Hallo Welt! Medienwerkstatt GmbH for Wikimedia Deutschland e. V.
Ostatnia wersja	continuous updates
Polityka zgodności	Snapshots releases along with MediaWiki. Master nie jest kompatybilny wstecznie.
MediaWiki	>= 1.43
PHP	7.0+
Zmiany w bazie danych	Nie
Licencja	Licencja GNU General Public License 2.0 lub nowsza
Pobieranie	Pobierz rozszerzenie Git [?]: Pobierz Git master przeglądaj repozytorium (Phabricator · GitHub) historia wprowadzeń repository contributors (GitHub) ocena kodu
Parametry $wgImageMagickIdentifyCommand $wgTiffUseExiv $wgTiffUseTiffinfo $wgTiffTiffinfoCommand $wgTiffIntermediaryScaleStep $wgTiffIdentifyRejectMessages $wgTiffIdentifyBypassMessages $wgTiffIdentifyRejectMessages $wgTiffTiffinfoRejectMessages $wgTiffMaxEmbedFiles $wgTiffMaxMetaSize $wgTiffErrorCacheTTL
Dostarczane haki PagedTiffHandlerTiffData PagedTiffHandlerExifData PagedTiffHandlerRenderCommand
Quarterly downloads	18 (Ranked 113rd)
Public wikis using	922 (Ranked 261st)
Przetłumacz rozszerzenie PagedTiffHandler jeżeli jest dostępne na translatewiki.net
Problemy	Otwarte zadania · Zgłoś błąd

The PagedTiffHandler extension allows to upload and display tiff-files into your wiki. It can handle multi-paged images and render them into thumbnails on per page basis.

Usage

You can embed images using standard image syntax. Additionally, there are two new parameters:

Parametr	Przykład	Function
page	[[Image:Test.tiff|page=2]]	Renders a thumbnail of the second page of test.tiff. Page numbers start with 1. Default value is 1.
lossy	[[Image:Test.tiff|lossy=false]]	If set to false, thumbnails are being rendered as png, otherwise as jpg. If no value is set, PagedTiffHandler determines the value based on the presence of an alpha channel. If alpha is there, thumbnail is rendered as png. Possible values for jpg: '1', 'true' and 'lossy'. Possible values for png: '0', 'false' and 'lossless'.

Pre-requisites

Required

Package	Opis	Link
"imagemagick" for identify	Does dynamic resizing and thumbnailing of images	www.imagemagick.org

Type the following in your shell to see if you have the above installed first:

which identify

Required (optionally)

Package	Description	Link
"exiv2" for exiv2	Exiv2 is a Cross-platform C++ library and a command line utility to manage image metadata. Provides support to retrieve EXIF from TIFF files.	www.exiv2.org
"libtiff-tools" for tiffinfo	Identify and retrieve basic TIFF metadata (more efficient than ImageMagick)	www.simplesystems.org/libtiff/

Type the following in your shell to see if you have the above installed first:

which exiv2 tiffinfo

For additional performance on very large TIFF files, you might want to install and configure the VipsScaler extension.

Installation

• Pobierz i umieść plik(i) w katalogu o nazwie PagedTiffHandler w folderze extensions/.
  Developers and code contributors should install the extension from Git instead, using:cd extensions/
git clone https://gerrit.wikimedia.org/r/mediawiki/extensions/PagedTiffHandler
• Dodaj poniższy kod na dole twojego pliku LocalSettings.php :

  wfLoadExtension( 'PagedTiffHandler' );
  

• Configure as required.
•  Zrobione – Przejdź do Special:Version na twojej wiki, aby sprawdzić czy rozszerzenie zostało pomyślnie zainstalowane.

Configuration

PagedTiffHandler depends on various external programs in order to process Tiff images.

• ImageMagick is used to reject/accept the image and render thumbail images. PagedTiffHandler will not work on any locally uploaded image without ImageMagick.
• tiffinfo can be used to reject/accept the image instead of ImageMagick, but it does not provide rendering (optional).
• Exiv2 is used to extract image metadata (optional).
• VipsScaler extension can be used for fast processing of large image files (optional).

Example configuration:

// Path to identify
$wgImageMagickIdentifyCommand = '/usr/bin/identify';
// Use exiv2? if false, MediaWiki's internal EXIF parser will be used
$wgTiffUseExiv = false;
// Path to exiv2 (MediaWiki core configuration option)
$wgExiv2Command = '/usr/bin/exiv2';
// Use tiffinfo? if false, ImageMagick's identify command will be used
$wgTiffUseTiffinfo = false;
// Path to tiffinfo
$wgTiffTiffinfoCommand = '/usr/bin/tiffinfo';

When thumbnailing very large images to very small sizes, it can be better better to downscale to an intermediary size first, instead of resizing in one go. By default PagedTiffHandler will downsize images larger than $wgTiffIntermediaryScaleStep (2048 pixels wide by default) first to $wgTiffIntermediaryScaleStep before downsizing to even smaller dimensions.

Example configuration:

// For thumbnails smaller than this, first scale to this amount
// Set to 0 to disable
$wgTiffIntermediaryScaleStep = 2048;

PagedTiffHandler rejects images based on error messages of ImageMagick or tiffinfo. There are three options:

• Images are rejected if the error message matches $wgTiffIdentifyRejectMessages or $wgTiffTiffinfoRejectMessages
• Images are accepted without moaning if the error message matches $wgTiffIdentifyBypassMessages or $wgTiffTiffinfoBypassMessages
• In other cases, images are accepted but the error message is recorded in the image metadata.

Example configuration (all of the parameters show the default configuration):

$wgTiffIdentifyRejectMessages = [
	'/^identify: Compression algorithm does not support random access/',
	'/^identify: Old-style LZW codes, convert file/',
	'/^identify: Sorry, requested compression method is not configured/',
	'/^identify: ThunderDecode: Not enough data at scanline/',
	'/^identify: .+?: Read error on strip/',
	'/^identify: .+?: Can not read TIFF directory/',
	'/^identify: Not a TIFF/',
];

$wgTiffIdentifyBypassMessages = [
	'/^identify: .*TIFFReadDirectory/',
	'/^identify: .+?: unknown field with tag .+? encountered/'
];

PagedTiffHandler also checks a few parameters of the image in order to be able to control the necessary processing time.

Example configuration:

// Maximum number of embedded files in tiff image
$wgTiffMaxEmbedFiles = 10000;
// Maximum size of meta data
$wgTiffMaxMetaSize = 64*1024; // 64kB

When thumbnailing fails for an image, PagedTiffHandler will not try again to render this image for some time. The setting below controls after how many seconds thumbnailing may be tried again.

Example configuration:

// TTL of Cacheentries for Errors
$wgTiffErrorCacheTTL = 84600;

Defaults

All of the above shown parameters are set as default in the configuration of the extension.

See also

• Extension:PdfHandler