まじですかー。これまでにいぱーいDTPのデザイナーさんに会ってきたけど、教えてくれなかったYO
K100（いわゆるスミ）は完全な黒ではない！ 濃いグレーだ。
まじですかー！ 知らなかったYO！
つか、黒にもいろいろあるわけで、こんなことに気づかなかったオレはアホだ。デザイナーさんにとっては、知ってて当たり前、教えるまでもないことだったのだろうな。
そういえばプリンタインクにもリッチブラックとかあったな。
The Problem
If there is an unforgivable sin, this would be it. Again, a simple understanding of CMYK is needed.
A printer takes the CMYK info it is sent and puts out ink according to that info. CMYK value refers to a set of 4 numbers between one and 100 representing the amount of each color mixed in to achieve the desired color. So you would immediately guess that k=100 would mean black, right?
Larry said so.
[...]
K=100 produces a dark grey that is definitively not black.
The Fix
Once again, easy fix; use values for rich black. Rich black mixes in some cyan, magenta, and/or yellow to darken the 100% Key. There are many different opinions on what is best, but there are basically two kinds; warm and cool. Generally accepted values (in order of CMY) are 70, 50, 30 (known as “designer black”), 60, 40, 40 (cool black) and 40, 60, 40, (warm black). All of these are mixed with k=100.
Some people say that a “C” value of 40 and a k value of 100 does the trick just fine; the point is to add some kind of extra into your blacks to make them… well, black.
Do NOT use rich black for smaller text; registration problems (where one cmyk ink prints slightly in the wrong place) will make your text unreadable. And no one wants that. Usually using k=100 for black text is readable enough.
Another neat trick: if your text is large enough that you want to use rich black, but is just small enough that registration may pose a threat, outline your text with .5 or 1 pt of k=100. This will take care of the registration problems. Note: the outline should be on the inside and should replace the original area it lays over, so that your text is not improperly displayed.
3 Deadly Sins of Print Design | Fuel Your Creativity
- デザイナー・ブラック
- 70, 50, 30, 100 (CMYK)
- クール・ブラック
- 60, 40, 40, 100
- ウォーム・ブラック
- 40, 60, 40, 100
- リッチ・ブラック
- 90, 60, 30, 100
印刷に出して確かめてみよーかなー。
ちなみにRGBにするとほとんど差はないですが、Webで微妙な黒を使い分けている人、いるんでしょうか？
P.S. こっちも参照
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