December 2022
Intermediate to advanced
208 pages
4h 44m
Japanese
Content preview from Python2年生 デスクトップアプリ開発のしくみ 体験してわかる！会話でまなべる！
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153
LESSON
20
画像の加工アプリ
［ファイルを開く］ボタンを押して、画像ファイルを読み込んでみよう。
ミノカサゴが、モノカサゴになった〜。
［ファイルを保存］ボタンを押せば、モノクロ化された画像が書き出さ
れるというわけだ。
モザイク画像に加工するアプリを作る
「モノクロ化」す る 処理を「モザイク化」す る 処理に変更すれば、「モザ
イク画像に加工するアプリ」も作れるよ。
少し変更するだけでできるんだね。
出力結果
❶クリックしてファイルを開く
❹確認
❸クリック
❷表示
Chapter
5
154
さっき作っ た「
monoimage.py
」とレイアウトや書き出し処理は
まったく同じなので、少しの修正だけでできるよ。まずは、アプリのタ
イトルの修正からだ。
win = sg.Window("", layout, size=(320,400))
「モノクロ処理」を「モザイク処理」に 変更しよう。モザイク画像にす
るにはまず、縦横比率を維持したまま、画像を縮小し て（ 例えば、横が
20
ドットになるまで）、その後元のサイズまで拡大する。
一度小さくしてから、大きくするのね。
オプションで「
resample=0
」と指定すれば、サイズ変更時にぼかし
がかからないので、きれいにモザイク化できるんだ。では、「モザイク ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.