stash correlate and attempt to go for color

hunks/adhoc/correlate.js

@@ -20,7 +20,6 @@ let correlate = (a, b, x, y) => {
   let sumA = 0
   let sumB = 0
   let sumDot = 0
-  let bi = 0
   // i will be index within the flat-af array under a,
   for(let i = 0; i < a.length; i ++){
     for(let j = 0; j < a[0].length; j ++){
@@ -29,36 +28,8 @@ let correlate = (a, b, x, y) => {
       sumDot += a[i][j] * b[i + x][j + y]
     }
   }
-  return sumDot / Math.sqrt(sumA * sumA * sumB * sumB)
-
-  /*
-  for(let i = 0; i < a.data.length; i ++){
-    sumA += a.data[i]
-    // to find the reciprocal pixel in b,
-    // we can start at the top-left corner: here is the 'i_th' element
-    // within b, correspondign to the XY of the top-left of a,
-    bi = (y * b.width * 4) + x * 4
-    // to get down from here, the row of a this i is in:
-    let rca = Math.floor(i / a.width * 4)
-    bi += rca * b.width * 4
-    // and the increment,
-    bi += (i % (b.width * 4))
-    // ok ?
-    if(bi >= b.data.length){
-      bi = b.data.length
-      // happens all the time, go home do this tomorrow
-      console.log('yep', bi, rca, i, x, y)
-      //throw new Error('halting')
-    }
-    sumB += b.data[bi]
-
-    sumDot += a.data[i] * b.data[bi]
-  }
-  */
-  //return 55 //(sumDot / Math.sqrt(sumA*sumA + sumB*sumB))
-  // a, b are str8 up matricies
-  //console.log(b.width)
-  // ok, now we can do the maths on a and b, thx
+  // I'm still not convinced this is a really great filter
+  return sumDot / Math.sqrt((sumB * sumB)*(sumA * sumA))
 }
 
 let delay = (time) => {
@@ -137,7 +108,7 @@ async function run(a, b){
       imdBuffer[lc ++] = dt
       imdBuffer[lc ++] = dt
       imdBuffer[lc ++] = dt
-      imdBuffer[lc ++] = dt
+      imdBuffer[lc ++] = 255
     }
   }
   let imgRes = new ImageData(imdBuffer, resX, resY)