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画質を維持したままサイズを大きくできる『waifu2x』を紹介するよ | FuchiAz.com

画質を維持したままサイズを大きくできる『waifu2x』を紹介するよ

はじめに

今回は画質を維持したままサイズを大きくすることができる waifu2x というプログラムを利用したサービスの紹介です。

ふつう画像をサイズだけ大きくしようとするとそれに伴って画質も低下するのが当然なのですが、waifu2x はAIで拡大時の情報を補完することで画質を維持したままサイズを拡大することを可能にしています。

私が普段利用していたWEB版のサービスの他に、iOSのアプリも存在していましたので、自分が使いやすい方を選べばいいと思います。

WEB版

WEB版にもいくつか同様のサービスが存在していますが、私が使っているサイトを載せておきます。

参考 waifu2x

使用方法

画像を拡大するだけのサービスなので、とくに使用方法を紹介するほどのものでもないです。

以上の印をつけたあたりを選択して実行(あるいは実行結果を保存)すればそれだけでOKです。

選択肢でわかるようにこちらの最大倍率は2倍までです。
一応2倍にしたものを再び2倍にすることで4倍にしたりすることはできます。

iOSアプリ版

検索してみたところいくつかあるようなので1つ選んで使ってみました。

waifu2x
waifu2x
開発元:Yi Xie
無料
posted withアプリーチ

もともとアニメ風アートのスケーリングを目的としていた?ためかアプリアイコンが可愛い女の子なのですが、こちらのアプリの場合は設定でシンプルなアイコンにも変更可能だったので、抵抗がある方でも大丈夫です。

アプリのアイコンは3種類から選択できる。

使用方法

WEB版同様こちらも特に使用方法で迷うことはないでしょう。

WEB版と同じような設定項目を選択し、開始をタップするだけです。

こちらは2倍、4倍を選択することができ、また複数枚を一度に処理することもできました。

サイズによると思いますが、1枚なら数秒~10秒程度で処理できるかと思います。

比較

試しに 800×450 サイズのネコの画像と、それをwaifu2xで2倍にした 1600×900 の画像を共にデスクトップPC(モニタ解像度 1920×1080)の壁紙にして比べてみました。

kawaii(元サイズ版)
元サイズ
2x

クリックで拡大すると違いがよく分かると思います。

元サイズのものだと、モニタ解像度に足りていないので引き伸ばされてしまい、ぼやっとしていますね。
対してwaifu2xで2倍にしたものの方はきれいに拡大されています。
(ヒゲのあたりを見るとわかりやすいかな)

イラストでも写真でも上手に拡大してくれるし、ノイズ除去もしてくれるので非常に助かります。

おわりに

今回は画像ファイルの画質を保ったまま拡大することができるwaifu2xについて紹介しました。

非常に便利ですので是非覚えておいてください。

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