Wikimore

**MediaWiki 拡張機能マニュアル**
VipsScaler; リリースの状態: 安定Category:Stable extensions/ja
実装	メディアCategory:Media handling extensions/ja
説明	Allows to scale PNG and JPEG images using VIPS
作者	Bryan Tong Minh (Bryanトーク)
MediaWiki	1.19+Category:Extensions with manual MediaWiki version/ja
データベースの変更	いいえ
ライセンス	GNU 一般公衆利用許諾書 2.0 以降
ダウンロード	拡張機能をダウンロード ; Git [?]: リポジトリを参照 (GitHub); Gerrit コードレビュー; Git コミットログ; Download source tarball; Category:Extensions in Wikimedia version control/ja; README
	パラメーター $wgVipsCommand; $wgVipsOptions; $wgVipsTestExpiry; $wgVipsExposeTestPage; $wgVipsThumbnailerHost;
	追加する権限 vipsscaler-test;
	使用するフック BitmapHandlerCheckImageAreaCategory:BitmapHandlerCheckImageArea extensions/ja; BitmapHandlerTransformCategory:BitmapHandlerTransform extensions/ja;
	translatewiki.net で翻訳を利用できる場合は、VipsScaler 拡張機能の翻訳にご協力ください
問題点	未解決のタスク · バグを報告

Category:GPL licensed extensions/jaCategory:All extensions/ja

The VipsScaler extension creates JPG and PNG thumbnails faster and at low memory usage. The extension replaces MediaWiki core's Media handlers for bitmaps, which default to ImageMagick. It is powered by the free image processing software VIPS, which speeds up resizing of large PNGs, and it improves the appearance of shrunken JPEGs.

The extension shells out to the VIPS binary. By configuring $wgVipsOptions, it can be configured to scale only certain files (for example, big PNG files).

インストール

VIPS

Install VIPS. It can be downloaded from https://libvips.github.io/libvips or your OS repository (see below).

Debian / Ubuntu

$ apt-get install libvips-tools

Mac OS X

$ brew install homebrew/science/vips
$ binary symlink is /usr/local/bin/vips

VipsScaler extension

Install VIPS
ダウンロードして、ファイルをextensions/フォルダー内のVipsScalerという名前のディレクトリ内に配置します。
開発者とコード寄稿者は、上記の代わりに以下を使用してGitからインストールします:
```
cd extensions/
git clone https://gerrit.wikimedia.org/r/mediawiki/extensions/VipsScaler
```
以下のコードを LocalSettings.php ファイルの末尾に追加します:
```
wfLoadExtension( 'VipsScaler' );
```
Configure as required.
完了 – ウィキの「Special:Version」に移動して、拡張機能が正しくインストールされたことを確認します。

設定

$wgVipsCommand: Path to the "vips" command (default: /usr/bin/vips).

$wgVipsOptions: Options and conditions to scale images with this scaler (default: empty). Set to an array of arrays. The inner array contains a condition array, which contains a list of conditions the image should pass for it to be scaled with VIPS. Conditions are mimeType, minArea, maxArea, minShrinkFactor, maxShrinkFactor. The other items in the array are options. Options available are:

sharpen - Set to an array with keys 'radius' and 'sigma', parameters to the Gaussian sharpen matrix.
preconvert - Convert the file to a .v file first, which costs some space but saves memory on the actual downsize
bilinear - Use im_resize_linear instead of im_shrink
convolution - Apply specified convolution matrix
setcomment - Add an EXIF comment specifying the source of the file. Requires $wgExiv2Command to be set properly.

Example

$wgVipsOptions = [
  // Sharpen jpeg files which are shrunk more than 1.2
  [
    'conditions' => [
      'mimeType' => 'image/jpeg',
      'minShrinkFactor' => 1.2,
    ],
    'sharpen' => [
      'radius' => 0,
      'sigma' => 0.8
    ],
  ],
  // Other jpeg files
  [
    'conditions' =>[
      'mimeType' => 'image/jpeg',
    ],
    'sharpen' => false,
    'bilinear' => true,
  ],
  // Do a simple shrink for PNGs
  [
    'conditions' => [
      'mimeType' => 'image/png',
    ],
  ],
];

$wgVipsExposeTestPage

Allow testing via "Special:VipsTest", which lets you verify it is working and see the difference in output quality. (default: false).