[html5] a question about canvas element's shadow effect

caoyipeng caoyp at cn.fujitsu.com
Tue May 19 18:27:24 PDT 2009

canvas element's shadow effect use Gaussian blur to fulfill.

In Gaussian blur, when do convolution operation, Gaussian template's size(or
Gaussian kernel width and height) affect the blur effect

,is there default value about Gaussian template's size(such as the size is
(6σ+1)*(6σ+1),σ is the standard deviation).




Cao Yipeng
Development Dept.I
Nanjing Fujitsu Nanda Software Tech. Co., Ltd.(FNST)
8/F., Civil Defense Building, No.189 Guangzhou Road ,
Nanjing , 210029, China 
TEL: +86+25-86630566-817
COINS: 79955-817
FAX: +86+25-83317685
MAIL: caoyp at cn.fujitsu.com



-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.whatwg.org/pipermail/help-whatwg.org/attachments/20090520/5479f90b/attachment-0001.htm>

More information about the Help mailing list