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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172
関連用語
用語に関連する話
用語の使用例
JPEG
と
PNG
画像の圧縮技術
画 像 のファイル サイズ を 小 さくする 圧 縮 に 使 わ れるファイル 形 式 。J P E G は 写 真 などを 圧
縮するのに使われる圧縮形式で、元に戻すことはできない非可逆圧縮だが、見た目はあ
まり変わらずにファイル サイズを小さくできる。PNG はイラストやロゴなどで多く使われる可
逆圧縮の形式で、Web で多く使われている。
画像ファイルの容量
画像はピクセル単位に色情報が
必要なため、横幅×縦幅×色の
ビット数で計算される。このため
大きな画像は、ファイルサイズも
大きくなる。
Webページの画像サイズ
ファイルサイズが大きい画像を
Web ページで公開すると、閲覧し
たとき画像の転送・表示に時間が
かかるため、圧縮してサイズを小
さくすることが求められる。
ディスクの容量を空ける
Web などで公開しなくても、コン
ピュータに多くの画像を保存す
ると、ハードディスクなどを多く
占有してしまうため、圧縮の効果
は大きい。
Keyword
152
▶
じぇい ぺぐ
▶
ぴんぐ（ぴん）
「同じ画像でもJPEGやPNGを使うとファイルサイズが小さくなるね。」
可逆圧縮と非可逆圧縮
……P71
解像度と画素、ピクセル
……P81
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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.