Grayscale - Intro to Java Programming Udacity English Japanese

Grayscale - Intro to Java ProgrammingYouTube↗ IA↗(long shot)
Education 2.1K views 5 likes 2 dislikes 23 Feb 2015

Udacity 651K subscribers United States YouTube↗

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In the olden days, cameras couldn't record glorious color, they only had grey.

昔のカメラはカラー写真を撮れず白黒写真だけでした

And sometimes we want to take a photograph and turn it back into grey to give

今ではカラー写真を逆に白黒にすることもあります

it that old fashioned effect. Now, you might thing that all you'd have to do is average the red, green, and blue values. But it's not quite that simple. As it

レトロ感を出すためです方法としては赤、緑、青の値の平均値を出せばいいのですがそんなに簡単ではありません

turns out, the receptors that we have in our eyes have different sensitivities

目の受容体は色に対して個別の感覚を持つからです

to colors. And what you actually have to do is take the red, green and blue

そこで実際のやり方として赤、緑、青それぞれの値に

values weighted by these factors, and then turn them into grey. And then, when

これらの係数で重みづけをして白黒に変えます

you're done with that, you can set red to these value green and blue, because

その時に赤、緑、青に同じ比率の値を設定します

they're all the same, that's what makes the color grey. And then, you're done.

輝度に色の違いはないので白黒になります

But we have the same problem that you just saw. Red, green, blue are integers.

ここで先ほどと同じ問題があります赤、緑、青はint型です

These weighing constants are fractional numbers. So, the whole expression is a

この重みをつけた定数は分数なので全体の式は分数になります

fractional number. And I want to put it back into an integer. So, the solution

それをint型に変換しなければなりません

is again, to inject a cast, put this expression in parentheses and put

その解決策はやはりキャストを入れ込むことです

parenthesis int before that. And then, you get it truncated down to the nearest integer. Once again, I'd like you to try that, so you can see it with your own

括弧の中にこの式を入れてその前に括弧をつけたintを置きますそして一番近い整数に切り捨てます自分の目で確かめてみましょう

eyes. Go ahead. Again, in the color class, implement a new method. In this

それではColorクラスで新しいメソッドを実行してください

case, it's the turnGray method. Take the red, green and blue values, combine

この場合はturnGrayメソッドです先ほどの方程式を使い

them to a gray value using the equation that you just saw. Make sure that you

赤、緑、青の値を合わせて白黒の値に変更します

get an integer. And then, take that integer and put it back into red, green and

整数になっていることを確認してその数字を使って赤、緑、青に戻します

blue. Go ahead and do it now.

さあやってみてください

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