確定是講 YPbPr.我把Dell回信的全文貼上來.懂英文的朋友可參照一下...
----------------------------------------------------------------
Hi

我們已經確認好情況暸。

sp2208 接HDMI時，每次通電屏幕都會髮大10％，zoom=10是正常的，設計是這樣的設計。

在HDMI事，顯示器用的是YPbPR的色差糢式，每次通電后會自動髮大。

（問題：

SP2208WFP (p/n: DX868) OSD/ Position -> Zoom is set 10 as default on HDMI

具體問題：

Consumer user found that the zoom option is set 10 as default when device is connected via HDMI.
Every time when turns on LCD, this value is reset to 10.

No functional impact but a little annoying.

Is this working as a desing on some reason?

解釋：

This is expected behavior of monitor, as per designed.

When input is in YPbPr color space, monitor will do 10% overscan. In this case I assume this customer is connecting monitor to DVD player which output is YPbPr. ）

）
Regards

__________ Information from ESET Smart Security, version of virus signature database 2866 (20080211) __________

The message was checked by ESET Smart Security.

http://www.eset.com

----------------------------------------------------------------