image: do not display color information by default

Author: antoinerg

src/traces/image/attributes.js

@@ -109,7 +109,8 @@ module.exports = extendFlat({
         description: 'Same as `text`.'
     },
     hoverinfo: extendFlat({}, plotAttrs.hoverinfo, {
-        flags: ['x', 'y', 'z', 'color', 'name', 'text']
+        flags: ['x', 'y', 'z', 'color', 'name', 'text'],
+        dflt: 'x+y+z+text+name'
     }),
     hovertemplate: hovertemplateAttrs({}, {
         keys: ['z', 'color', 'colormodel']

src/traces/image/hover.js

@@ -60,6 +60,7 @@ module.exports = function hoverPoints(pointData, xval, yval) {
         text = trace.text[ny][nx];
     }
 
+    // TODO: for color model with 3 dims, display something useful for hovertemplate `%{color[3]}`
     var py = ya.c2p(cd0.y0 + (ny + 0.5) * trace.dy);
     var xVal = cd0.x0 + (nx + 0.5) * trace.dx;
     var yVal = cd0.y0 + (ny + 0.5) * trace.dy;