将特殊颜色透明

滤镜:FILTER: chroma(color:#FFFFFF) <table cellspacing = "0" cellpadding = "0" border = "1">          <tbody>              <tr align = "center" bgcolor = "#cccccc">                  <td>                      <img src = "http://www.asp.net/images/quickstart.gif"/></td>                  <td bgcolor="#CCFF66">                      <img style = "FILTER: chroma(color:#FFFFFF)" src = "http://www.asp.net/images/quickstart.gif"/>                     </td>              </tr>              <tr align = "center">                  <td>                      未使用该滤镜</td>                  <td>                      使用该滤镜</td>              </tr>

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