May 2019
Beginner to intermediate
296 pages
6h 58m
Japanese
Content preview from IT用語図鑑 ビジネスで使える厳選キーワード256
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.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.
71
関連用語
用語に関連する話
用語の使用例
2
I
T
可逆圧縮と非可逆圧縮
連 続した デ ータをまとめる
単純な圧縮手法として、連長圧縮
が あ り「AAAAABBBCCCC」と い
うデータを「A5B3C4」のように、
登場するデータとその長さで表
す。FAXなどで使われた。
複 数 のファイル をまとめる
複数のファイルを1つにまとめて
取り扱う「アーカイブ」をする形
式にZIPファイルがあり、サイズ
を圧縮して格納することもでき
る。
データ圧縮率の表現
圧縮したデータが元のデータと
比べてどのくらいのサイズに減っ
たかを表す割合が圧縮率で、より
小さく圧縮できた状態を「圧縮率
が高い」と言う。
ファイル の 容 量を 減らす
デ ータ の 中 身 を 変 え ず に サ イズ を 小 さくすることを「 圧 縮 」と 言 い 、元 の サ イズ に 戻 す ことを
「展開」や「解凍」と言う。このとき、元のデータとまったく同じに復元できる圧縮方法を
可逆圧縮、完全には一致しない圧縮方法を非可逆圧縮や不可逆圧縮と言う。静止画や
動画などの圧縮には劣化が目立たない程度の非可逆圧縮が使われている。
▶
か ぎ ゃくあ っし ゅく
▶
ひ か ぎ ゃくあ っしゅく
Keyword
056
「文書は可逆圧縮でないと困るけど画像なら非可逆圧縮で十分だね。」
JPEG とPNG
……P172
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.