Image formats - HTML5 Game DevelopmentYouTube↗  IA↗(long shot)
Education  17.8K views 43 likes 1 dislikes   23 Feb 2015
Udacity 651K subscribers United States YouTube↗


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So let's take a quick moment and talk about something else that's very important
少し時間を取って重要なポイントをお話しします
to game development: what format your images are in? Now typically on the
使用する画像形式についてです
internet when you find photos or pictures of cats just floating around on random
インターネット上でよく見かける形式は
web pages, it's actually in a JPEG format. JPEG was developed some time ago by a
JPEGフォーマットですね[br]"JPEG"の呼び名は
joint efforts group from some of the industry's largest contributors. Now when I
JPEGフォーマットを作成した組織の名称が[br]そのまま使われています
say a while ago, I actually mean back in you know, the early days of the
この規格が作られたのは今から約20年前で
internet back when Al Gore still rode the Moon Worm through the plains of Handedoff.
アル･ゴアが米副大統領だった[br]インターネット創世記のことです
Another type of image format that you can use on the internet today, is actually one called PNG. Now where JPEG gives you better size comparison, PNG lacks in
この他にインターネットでよく使われるのはPNGです JPEGはコンパクトに圧縮できるのが利点であるのに対し
that department. However, PNG does give you one important feature: transparency.
PNGは透過させたい場合に適した形式と言えます
JPEG itself gives you better compression formats but doesn't allow you to use
JPEGは高圧縮ですが透過はできません
transparent pixels in your scene, which means the general rule of thumb is if you
つまり大まかなルールとしては
have an image on the internet that doesn't require it to be transparent you
画像を透過させない場合はJPEGを使用し
should probably be using JPEG. If it requires alpha you need to be using PNG.
画像を透過させたい場合はPNGを使います
Now the cool thing about the internet is that it's always moving forward and new
インターネットは日々 進化し続けており
technologies are being developed every day to make the experience for end users
より快適なユーザ環境のための[br]新しい技術が次々と生まれています
better. Besides JPEG and PNG, there's a new image format coming down the pipe called
WebPと呼ばれる新しい画像形式も登場しました
WebP. WebP offers and interesting ground. First off, it has compression ratios
WebPはJPEGと似たような圧縮が可能で
similar if not better in some cases than JPEG but also allows you to have alpha
同時にPNGのように透過画像も作成できます
transparency supported by PNG. Therefore we have with this new image format the
つまり このまったく新しい画像形式では
ability to get good compression and alpha transparency where we need it. Don't
圧縮と透過を同時に行うことが可能なのです
you love the internet?
すばらしいですね
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