You think Color Difference is easy being calculation? 有沒有色差其實很複雜的八卦?

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Hello, I am Colorful Blanche.

Today I want to  share some knowledge about Color Difference, which is an important topic in Color Science.

嗨大家好,我是卡樂佛布蘭雪

今天想跟大家分享一點小知識:色差

而這個觀念在色彩科學裡可說是一直以來很重要的議題

 

Why should we need Color Difference(ΔE)?    為何我們需要色差?

 Have you ever noticed that there’re some ties in same design, same color theoretically, but you just feel a little bit different of them.

生活中,你可能發現到明明是同款設計,應該要擁有同款顏色的領帶,你卻察覺似乎某些部分有些微不一樣的顏色

ties-1149342_1920

Or imagining that you are a designer and also a perfectionist, received the thread that color doesn’t match with sample color, then you call back to salesman, and he tell you that they are the same color(to him).

或者,想像你今天是個完美主義的設計師,收到的絲線卻與當初看的樣本顏色不一樣,而廠商業務卻說它們是一樣的顏色

thread-1195629_1920

Maybe you don’t care that small difference on color at all, but in some industry, they do! For example, textile and print business that need to manage the consistency of color. So, application of Color Difference  in our daily life is everywhere!

 也許你不會在意這點小色差,但對於某些產業來說,這可是個大問題!  舉凡有關紡織、印刷等相關產業,色彩管理的一致性可是很重要的。所以,我們的日常生活怎能缺少色差這件事情呢?

 

International Commission on Illumination(CIE)    國際照明委員會

“ The International Commission on Illumination (CIE) formed in the early 1900s to standardize the fields of colorimetry, photometry, and imaging. The commission addressed the topic of color difference in 1976, introducing the world to the concept of Delta E. ”  – Zachary Schuessler

國際照明委員會,也稱作 CIE ,於 1913 創立,此組織關注色彩、影像、光度學,且在 1976 時發表了色差公式,向大家介紹關於色差的概念

(image source:http://www.abbreviations.com/term/30385)

Formula of Color Difference      色差公式其實有點複雜

If you want to know more about the derivation of formula, you can find on here or some professional books. I only put a little simple graphics here to introduce the concept.

如果你想知道色差公式的推導及演進,可以參考這裡,或是有許多專業書籍有詳細地推導過程(包含期刊)

在這裡,布蘭雪僅放上些簡單的圖示(引用自他人網站),用來輔助介紹一些觀念

 

So, what’s the definition of Delta E (ΔE)? You can think that can represent a distance of 2 color.

所以色差(ΔE)的定義是什麼呢? 你可以把它想成是兩個顏色之間的距離

 

First formula of Color Difference is CIE76, as shown  below.

而最早推出的色差公式是 CIE76,如下圖所表達的(CIELAB 色差)

(image source: ALAN MARTIN)

 

CIE76 is easy to be used because it’s simple calculation. However, we need high accuracy of it. So, CIE improved the formula called CIE94 show as follow. I know it looks so different with CIE76(and more complicated). But it truly performed better than CIE76.

CIE76 一推出,很容易能被使用因為計算式簡單。而後,工業界在應用上發生些問題,所以希望 CIE 能夠推出更高準確度的公式。在 1994 年推出進化版色差公式 CIE94,公式如下圖。雖然看起來滿複雜,而且和第一個公式長得好不一樣……但的確表現的比 CIE76來得好!

(image source: Kurabo)

Then, CIE refined the formula called CIEDE2000 to solve some problems.  Until now, it’s the most accurate color difference formula!

後來 CIE 又重新的修改色差公式以解決一些問題,稱為 CIEDE2000 ,直到現在為止都是相較其他色差公式較為準確的喔!(如果想聽公式解釋也歡迎留言XD)

(image source: ColorMine.org)

 

After explaining the concept of color difference.

Let’s play a game 😄   (Click the image to website~)

You can leave a comment to tell me your SCORE haha

And see you next time~

Don’t forget come to my fan page ColorfulBlanche 卡樂佛布蘭雪 to give me a Like 👍

在簡單的解釋完色差觀念後,一起來玩個小遊戲吧 XD (點下面圖片)

大家可以留言給我你們的分數、小感想及建議唷

最後也別忘了來我們的粉絲專頁按讚喔 ColorfulBlanche 卡樂佛布蘭雪

下次見~

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2 Comments

  1. 倫仔 says:

    布蘭雪老師!!!!!!我得了19分!!!!

  2. colorfulblanche says:

    @倫仔 妳好厲害!! 19分的眼力很接近鷹眼了哈哈哈

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