蘋果手錶又曝"紋身門"

With a variety of bands, and price tags ranging all the way from $349 – $17,000, there's an Apple Watch for everyone. Except, possibly, the heavily tattooed.

面向大衆推出的Apple Watch，款式多樣，價格從349美元到17000美元不等。現在它卻被發現可能不適用於有大量紋身的人。

That's according to a new thread on Reddit which claims that several tattoo-sporting Apple Watch customers are having trouble using the device, because the wearable's wrist-detection feature gets confused by the way in which tattoos reflect the green and infrared light emitted by the Watch.

Reddit上的一個新帖稱，幾個有紋身的消費者發現他們的Apple Watch無法正常使用，原因在於紋身會反射手錶發射出的綠光和紅外光，導致該可穿戴設備的手腕監測功能被幹擾。

The result? People with tattoos don't get notifications, unless they move the Watch to an un-tattooed area, or turn off wrist detection. Not exactly ideal for those with full sleeves!

結果怎麼樣？有紋身的人除非把手錶戴在沒有紋身的地方，或者關閉手腕監測功能，否則他們無法接到通知。這對於整個手臂都有紋身的人來說不太可能。

“I thought my shiny new 42mm [Watch] had a bad wrist detector sensor,” writes one user. “The [W]atch would lock up every time the screen went dark and prompted me for my password. I wouldn't receive notifications. I couldn't figure out why especially since the watch was definitely not losing contact with my skin. [A]lso I couldn't find anything online with people experiencing this issue. I was about to give up and call Apple … when I decided to try holding it against my hand (my left arm is sleeved and where I wear my watch is tattooed as well) and it worked. My hand isn't tattooed and the Watch stayed unlocked. Once I put it back on the area that is tattooed with black ink the watch would automatically lock again.”

“我覺得我亮眼的新42毫米手錶的手腕監測功能有問題，”一名使用者寫到。“屏幕一黑手錶就鎖上了，並提示我輸入密碼。我收不到通知。手錶並沒有與皮膚失去接觸，所以我弄不清原因。網上也沒有人提出同樣的問題。我打算放棄並且給Apple公司打電話。我的左臂上有紋身，戴手錶的位置也有。我試着把手錶拿在手裏，它就可以正常使用了。我的手上沒有紋身，手錶就一直處於開啓狀態。一旦我把它放在有黑色紋身的地方，它就又自動鎖上了。”

As a possible explanation, another Redditor writes that:

一位網友給出了較爲合理的解釋：

“Oxyhemoglobin has several local peaks of absorbance which can be used for pulse oximetry: one green, one yellow, one infrared, etc. Apple uses the ones at infrared and green parts of the spectrum. Now, here's some key facts. Melanin and ink are both equally good at absorbing frequencies over 500nm, which sadly includes the green. But, melanin's absorbance falls down so rapidly that by the infrared end of the spectrum its hardly absorbing anything at all. That, combined with the fact that Apple adjusts the sensitivity/light level dynamically means infrared is probably black people friendly. Ink has a much more gradual fall off, so even infrared might not work for them.”

“氧基血紅素能快速吸收綠光、黃光和紅外光等，可用於脈搏血氧測量。蘋果公司就利用了其可吸收光譜中的綠光和紅外光的性能。現在，有幾個關鍵原理。黑色素和墨水都易於吸收頻率高於500納米的光，可悲的是，這其中就包括綠光。但是，黑色素的吸光度下降迅速，到光譜紅端它幾乎什麼都不能吸收了。再加上手錶能不斷地調節感光度，這就意味着紅外光可能對黑皮膚較爲友好。而墨水的的吸光度下降平緩，因此連紅外光也無法爲其工作了。”

While it's possible to turn off the wrist detection feature, this also stops Apple Pay from working. We've reached out to Apple to ask if this is a problem that's been reported elsewhere, and will update this post when we hear back.

儘管能關閉手腕監測功能，但手錶的支付功能也就隨之不能使用了。我們已經聯繫了蘋果公司，詢問了其他地方是否也有同樣的問題。收到回覆後，會爲您帶來後續報道。

Tattoo-gate, anyone?

蘋果紋身門，誰能解決這個問題呢？