アルファチャンネル付きJPEG
ビットマップイメージは重い。ピクセルの集まりだからファイルサイズが大きくなる。しかもちょっと前までFlashでビットマップを扱うのはいろいろと細かいTipsが必要だった。
動作が軽快とはいえないFlash Playerで再生することを考えると、スムースな再生のためには重いビットマップデータを扱うにはそれなりに工夫をするのは当然だった。
Flashに切り抜き画像を持ってくる場合。
いつもは、アルファチャンネル付きのPNG形式で書き出して、そいつをFlashに読み込んでいる。
読み込んだイメージをシンボルにしたあと、ビットマッププロパティを開いてロスレスを選択している人が多いと聞いた。
確かに、読み込んだPNG形式やPSD形式の画像ファイルがアルファチャンネルを含んでいるデータなら、気持ち的にロスレスを選択してしまうのが自然な考かも。
JPEGはアルファチャンネルをサポートしていないからと、先入観がかえってじゃまになる。
そんなときは、Flashのビットマッププロパティを開いて、JPEG圧縮してしまうに限る。その画像がアルファチャンネルつきの切り抜き画像でも大丈夫。FlashはアルファチャンネルつきのJPEG圧縮をサポートしている数少ないソフトだから。
これでファイルサイズのダイエットにもなって喜ばしい限り。
ただしスムージングは処理が重いのでOFFにしておいたほうがいいかも。
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