Kokkoja as of 2026-10-10: the teacher's requests, the Session window, notices, the QR code, the license

client/js/image_info.js

@@ -11,13 +11,21 @@
 /** Resolutions outside this range are mistakes, not information. */
 const LEAST_DPI = 30;
 const MOST_DPI = 2400;
+/**
+ * The nominal screen resolutions that cameras, phones and screenshots
+ * write without meaning them; an image so marked arrives at the default
+ * size instead (Andy, 2026-10-08, with every image now placed at its
+ * natural size: at 72 dpi a phone's photo would be over a metre wide).
+ */
+const NOMINAL_DPI = [72, 96];
 
 /**
  * @param {number | null} dpi
  * @returns {number | null}
  */
 function plausible(dpi) {
-  return dpi !== null && dpi >= LEAST_DPI && dpi <= MOST_DPI ? dpi : null;
+  if (dpi === null || dpi < LEAST_DPI || dpi > MOST_DPI) return null;
+  return NOMINAL_DPI.some((nominal) => Math.abs(dpi - nominal) < 0.5) ? null : dpi;
 }
 
 /**