-Min: <input id="Ci_min" value="-1.5" maxlength="6" size="6" type="text">
-Max: <input id="Ci_max" value="1.5" maxlength="6" size="6" type="text">
+<br>Min:
+<input id="Ci_min" value="-1.5" maxlength="10" size="10" type="text"
+ onchange="checkISValue(this, 'coord'); recalcCoord('Ci', 'scale');">
+Max:
+<input id="Ci_max" value="1.5" maxlength="10" size="10" type="text"
+ onchange="checkISValue(this, 'coord'); recalcCoord('Ci', 'scale');">
+Scale:
+<input id="Ci_scale" value="3.0" maxlength="10" size="10" type="text"
+ onchange="checkISValue(this, 'coord'); recalcCoord('Ci', 'max');">
+
+<br><br>Image size:
+<br>Width:
+<input id="image_width" value="300" maxlength="4" size="4" type="number"
+ onchange="checkISValue(this, 'dim'); recalcCoord('Ci', 'scale');">
+Height:
+<input id="image_height" value="300" maxlength="4" size="4" type="number"
+ onchange="checkISValue(this, 'dim'); recalcCoord('Cr', 'scale');">
+<input type="checkbox" id="proportional" onchange="checkProportions();">
+<label for="proportional">proportional</label>