diff --git a/app/api/formulas.py b/app/api/formulas.py
index 62577459..e399fb93 100644
--- a/app/api/formulas.py
+++ b/app/api/formulas.py
@@ -9,23 +9,28 @@ from django.utils.translation import gettext_lazy as _
 algos = {
     'NDVI': {
         'expr': '(N - R) / (N + R)',
-        'help': _('Normalized Difference Vegetation Index shows the amount of green vegetation.')
+        'help': _('Normalized Difference Vegetation Index shows the amount of green vegetation.'),
+        'range': (-1, 1)
     },
     'NDYI': {
         'expr': '(G - B) / (G + B)',
-        'help': _('Normalized difference yellowness index (NDYI), best model variability in relative yield potential in Canola.')
+        'help': _('Normalized difference yellowness index (NDYI), best model variability in relative yield potential in Canola.'),
+        'range': (-1, 1)
     },
     'NDRE': {
         'expr': '(N - Re) / (N + Re)',
-        'help': _('Normalized Difference Red Edge Index shows the amount of green vegetation of permanent or later stage crops.')
+        'help': _('Normalized Difference Red Edge Index shows the amount of green vegetation of permanent or later stage crops.'),
+        'range': (-1, 1)
     },
     'NDWI': {
         'expr': '(G - N) / (G + N)',
-        'help': _('Normalized Difference Water Index shows the amount of water content in water bodies.')
+        'help': _('Normalized Difference Water Index shows the amount of water content in water bodies.'),
+        'range': (-1, 1)
     },
     'NDVI (Blue)': {
         'expr': '(N - B) / (N + B)',
-        'help': _('Normalized Difference Vegetation Index shows the amount of green vegetation.')
+        'help': _('Normalized Difference Vegetation Index shows the amount of green vegetation.'),
+        'range': (-1, 1)
     },
     'ENDVI':{
         'expr': '((N + G) - (2 * B)) / ((N + G) + (2 * B))',
@@ -59,7 +64,8 @@ algos = {
     },
     'GNDVI':{
         'expr': '(N - G) / (N + G)',
-        'help': _('Green Normalized Difference Vegetation Index is similar to NDVI, but measures the green spectrum instead of red.')
+        'help': _('Green Normalized Difference Vegetation Index is similar to NDVI, but measures the green spectrum instead of red.'),
+        'range': (-1, 1)
     },
     'GRVI':{
         'expr': 'N / G',
@@ -153,7 +159,7 @@ def lookup_formula(algo, band_order = 'RGB'):
         raise ValueError("Cannot find algorithm " + algo)
 
     input_bands = tuple(b for b in re.split(r"([A-Z][a-z]*)", band_order) if b != "")
-
+    
     def repl(matches):
         b = matches.group(1)
         try:
diff --git a/app/static/app/js/components/Histogram.jsx b/app/static/app/js/components/Histogram.jsx
index 217d23cb..9779b34e 100644
--- a/app/static/app/js/components/Histogram.jsx
+++ b/app/static/app/js/components/Histogram.jsx
@@ -55,7 +55,9 @@ export default class Histogram extends React.Component {
 
     const st = {
         min: minX.toFixed(3),
-        max: maxX.toFixed(3)
+        max: maxX.toFixed(3),
+        minInput: minX.toFixed(3),
+        maxInput: maxX.toFixed(3)
     };
 
     if (!this.state){
@@ -235,6 +237,9 @@ export default class Histogram extends React.Component {
   }
     
   componentDidUpdate(prevProps, prevState){
+      if (prevState.min !== this.state.min) this.state.minInput = this.state.min;
+      if (prevState.max !== this.state.max) this.state.maxInput = this.state.max;
+
       if (prevState.min !== this.state.min || 
           prevState.max !== this.state.max ||
           prevProps.colorMap !== this.props.colorMap ||
@@ -271,6 +276,7 @@ export default class Histogram extends React.Component {
   }
         
   handleChangeMax = (e) => {
+    this.setState({maxInput: e.target.value});
     const val = parseFloat(e.target.value);
 
     if (val >= this.state.min && val <= this.rangeX[1]){
@@ -279,6 +285,7 @@ export default class Histogram extends React.Component {
   }
 
   handleChangeMin = (e) => {
+    this.setState({minInput: e.target.value});
     const val = parseFloat(e.target.value);
 
     if (val <= this.state.max && val >= this.rangeX[0]){
@@ -290,8 +297,8 @@ export default class Histogram extends React.Component {
     return (<div className={"histogram " + (this.props.loading ? "disabled" : "")}>
         <div ref={(domNode) => { this.hgContainer = domNode; }}>
         </div>
-        <label>{_("Min:")}</label> <input onChange={this.handleChangeMin} type="number" className="form-control min-max" size={5} value={this.state.min} />
-        <label>{_("Max:")}</label> <input onChange={this.handleChangeMax} type="number" className="form-control min-max" size={5} value={this.state.max} />
+        <label>{_("Min:")}</label> <input onChange={this.handleChangeMin} type="number" className="form-control min-max" size={5} value={this.state.minInput} />
+        <label>{_("Max:")}</label> <input onChange={this.handleChangeMax} type="number" className="form-control min-max" size={5} value={this.state.maxInput} />
     </div>);
   }
 }