transparent background image

I have the following css.

   #mypass{
                background-image: url("Images/logo.png");
                background-attachment: fixed;
                background-position:140px 100px ;
                background-size: 100px;
                background-repeat: no-repeat;
                opacity:0.5;
                fileter:alpha(opacity=40);
                color: blue;
        }

and iam using this as

<div id="mypass">
      <center><h2>PRAGATI ENGINEERING COLLEGE</h2>
    <h5>1-378,ADB Road,Surampalem-533437,E.G.Dist.,ph:08852-252233</h5></center>

      <%    out.println("________________________________________________________");
        String photo="Image/"+id+".jpeg";
       System.out.println(photo);

       String yy="";
       int y=((1900+d.getYear())-(Integer.parseInt(id.substring(0, 2))+2000))+1 ;
       switch(y){
          case 1:   yy=y+" st";break;
          case 2:   yy=y+" rd";break;
          case 3:   yy=y+" rd";break;
          case 4:   yy=y+" th";break;
          default: yy=y+" th";
       }

       int branch=Integer.parseInt(id.substring(6,8));
       System.out.println(branch);
       switch(branch){
         case 12:yy+=" IT";break;
         case 05:yy+=" CSE";break;
         case 03:yy+=" MECH";break;
         case 02:yy+=" EEE";break;
         case 04:yy+=" ECE";break;
         default:开发者_如何学Pythonyy+="PEC";
       }
    %>
      <h2 class="buspass" style="color:#FF33CC"><a class=title onclick="javascipt:window.print(), width=400, height=400" onmouseover="this.style.cursor='hand'">BusPass</a></h2>
      <img class="printright" src="<%=photo%>" width="90" height="90" />
      <table>
         <!-- <tr><td>RollNumber</td><td>: <%=id%></td></tr> -->
          <tr ><td>Name</td><td style="color:black">: <%=name%></td></tr>
          <tr><td>Class</td><td style="color:black">: <%=yy%></td></tr>
          <tr><td>AcadamicYear</td><td style="color:black">: <%=s%></td></tr>
          <tr><td>Stage</td><td style="color:black">: <%=pickuppoint%></td></tr>
          <tr><td>BusRoute</td><td style="color:black">: <%=routecode%></td></tr>
        <!--  <tr><td>SeatNo</td><td>: <%=seatno%></td></tr>-->
        <!--  <tr><td>IssueDate</td><td>: <%=ddd%></td></tr> -->
      <!--    <tr><td>ValidTill</td><td>: <%=valid%></td></tr> -->
      </table>
      <h3 class="printrightdown">INCHARGE</h3>
    </div>

that is applied to all the elements that uses the class.Instead i want to use opacity and filters only to background image..How can i do it ??

You can't adjust the translucency of a background image with CSS.

You can adjust the translucency of an entire element (opacity) or of a plain background rgba(), but not a background image.

Use an image format that supports translucency natively (such as PNG) and embed the translucency you want in the image itself.

The element that needs to have semi-transparent background:

#myPass

This is how without touching the HTML, we add controllable transparency background to the element:

#myPass::before {
    content: "";
    position: absolute;
    top: 0; right: 0;
    bottom: 0: left: 0;
    background: url(image.jpg) no-repeat top center;
    opacity: 0.5;
}

The only thing to note is that the #myPass element, must be positioned:

#myPass {
    position: relative; /* absolute is good too */
}

Just ran into this issue myself. If you combine linear-gradient with the background image url, you can control image opacity. By keeping the two "gradients" the same, you can get a filter/opacity effect without using opacity proper.

i.e.

 .bg-image {
        background: linear-gradient(rgba(255,255,255,0.5), rgba(255,255,255,0.5)), url(path-to-image.jpg) center no-repeat;
        background-size: cover;
      }

Why don't you create another div and use it as a pseudo-background or something?

This is the way to do it:

div {
  width: 200px;
  height: 200px;
  display: block;
  position: relative;
}

div::after {
  content: "";
  background: url(image.jpg);
  opacity: 0.5;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  position: absolute;
  z-index: -1;   
}