Pick Color In Image

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This allows one to find a color on an image, and know the RGB value.

Head Code:

<SCRIPT language=JavaScript>

<!-- Begin
addary = new Array();           //red
addary[0] = new Array(0,1,0);   //red green
addary[1] = new Array(-1,0,0);  //green
addary[2] = new Array(0,0,1);   //green blue
addary[3] = new Array(0,-1,0);  //blue
addary[4] = new Array(1,0,0);   //red blue
addary[5] = new Array(0,0,-1);  //red
addary[6] = new Array(255,1,1);
clrary = new Array(360);
for(i = 0; i < 6; i++)
for(j = 0; j < 60; j++) {
clrary[60 * i + j] = new Array(3);
for(k = 0; k < 3; k++) {
clrary[60 * i + j][k] = addary[6][k];
addary[6][k] += (addary[i][k] * 4);
   }
}
function capture() {
if(document.layers) {
layobj = document.layers['wheel'];
layobj.document.captureEvents(Event.MOUSEMOVE);
layobj.document.onmousemove = moved;
}
else {
layobj = document.all["wheel"];
layobj.onmousemove = moved;
   }
}
function moved(e) {
y = 4 * ((document.layers)?e.layerX:event.offsetX);
x = 4 * ((document.layers)?e.layerY:event.offsetY);
sx = x - 512;
sy = y - 512;
qx = (sx < 0)?0:1;
qy = (sy < 0)?0:1;
q = 2 * qy + qx;
quad = new Array(-180,360,180,0);
xa = Math.abs(sx);
ya = Math.abs(sy);
d = ya * 45 / xa;
if(ya > xa) d = 90 - (xa * 45 / ya);
deg = Math.floor(Math.abs(quad[q] - d));
n = 0;
sx = Math.abs(x - 512);
sy = Math.abs(y - 512);
r = Math.sqrt((sx * sx) + (sy * sy));
if(x == 512 & y == 512) {
c = "000000";
}
else {
for(i = 0; i < 3; i++) {
r2 = clrary[deg][i] * r / 256;
if(r > 256) r2 += Math.floor(r - 256);
if(r2 > 255) r2 = 255;
n = 256 * n + Math.floor(r2);
}
c = n.toString(16);
while(c.length < 6) c = "0" + c;
}
if(document.layers) {
document.layers["wheel"].document.f.t.value = "#" + c;
document.layers["wheel"].bgColor = "#" + c;
}
else {
document.all["wheel"].document.f.t.value = "#" + c;
document.all["wheel"].style.backgroundColor = "#" + c;
}
return false;
}
//  End -->
</SCRIPT>

Init Code:

capture();

Body Code:

<DIV id=wheel style="LEFT: 77px; VISIBILITY: visible; POSITION: absolute; TOP: 166px">
<TABLE height=256 cellSpacing=0 cellPadding=0 width=550 border=0>
  <TBODY>
  <TR>
    <TD><IMG height=256 src="/data/ex_956/colorwheel.jpg" width=256 border=0> </TD></TR>
  <TR>
    <TD align=middle><BR>
      <FORM name=f><INPUT size=27 name=t> </FORM>
    move mouse over image to view 4096 colors</TD>
    <TD vAlign=top width=240> </TD></TR></TBODY></TABLE></DIV>

Times Viewed: 5

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