diff --git a/demo/src/App.js b/demo/src/App.js
index ef264c707..0aba63409 100644
--- a/demo/src/App.js
+++ b/demo/src/App.js
@@ -39,10 +39,10 @@ export default class App extends PureComponent {
     this.resize = this.resize.bind(this)
     this.state = {
       sliderValues:{
-        channel_0: 10000,
-        channel_1: 10000,
-        channel_2: 10000,
-        channel_3: 10000
+        channel_0: [0, 20000],
+        channel_1: [0, 20000],
+        channel_2: [0, 20000],
+        channel_3: [0, 20000]
       },
       colorValues:{
         channel_0: [255, 0, 0],
diff --git a/package-lock.json b/package-lock.json
index 11a699c01..31126d00d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "@hubmap/vitessce-image-viewer",
-  "version": "0.0.1",
+  "version": "0.0.2",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/src/layers/microscopy-viewer-layer/microscopy-viewer-layer.js b/src/layers/microscopy-viewer-layer/microscopy-viewer-layer.js
index 7df3e80e8..bf6e82772 100644
--- a/src/layers/microscopy-viewer-layer/microscopy-viewer-layer.js
+++ b/src/layers/microscopy-viewer-layer/microscopy-viewer-layer.js
@@ -49,12 +49,14 @@ export class MicroscopyViewerLayer extends BaseTileLayer {
     })
     var diff = 6 - orderedSliderValues.length
     for (var i = 0; i < diff; i++) {
-      orderedSliderValues.push(65535);
+      orderedSliderValues.push([0,65535]);
     }
     var diff = 6 - orderedColorValues.length
     for (var j = 0; j < diff; j++) {
       orderedColorValues.push([0,0,0]);
     }
+    // flatten for use on shaders
+    var flatSliderValues = [].concat.apply([], orderedSliderValues)
     orderedColorValues = orderedColorValues.map(color => color.map(ch => ch / 255))
     const getZarr = ({ x, y, z }) => {
       return loadZarr({
@@ -66,7 +68,7 @@ export class MicroscopyViewerLayer extends BaseTileLayer {
       : props.getTileData
     const overrideValuesProps = Object.assign(
       {}, props, {
-        sliderValues: orderedSliderValues,
+        sliderValues: flatSliderValues,
         colorValues: orderedColorValues,
         minZoom,
         getTileData,
diff --git a/src/layers/xr-layer/xr-layer-fragment.js b/src/layers/xr-layer/xr-layer-fragment.js
index 37d33dd01..4ab3991cf 100644
--- a/src/layers/xr-layer/xr-layer-fragment.js
+++ b/src/layers/xr-layer/xr-layer-fragment.js
@@ -14,7 +14,7 @@ uniform usampler2D channel4;
 uniform usampler2D channel5;
 
 // range
-uniform float sliderValues[6];
+uniform vec2 sliderValues[6];
 
 // color
 uniform vec3 colorValue0;
@@ -61,19 +61,18 @@ vec3 rgb2hsv(vec3 rgb) {
  }
 
 void main() {
-  float channel0Color = float(texture(channel0, vTexCoord).r) / sliderValues[0];
-  float channel1Color = float(texture(channel1, vTexCoord).r) / sliderValues[1];
-  float channel2Color = float(texture(channel2, vTexCoord).r) / sliderValues[2];
-  float channel3Color = float(texture(channel3, vTexCoord).r) / sliderValues[3];
-  float channel4Color = float(texture(channel4, vTexCoord).r) / sliderValues[4];
-  float channel5Color = float(texture(channel5, vTexCoord).r) / sliderValues[5];
+  float channel0Color = (float(texture(channel0, vTexCoord).r) - sliderValues[0][0]) / sliderValues[0][1];
+  float channel1Color = (float(texture(channel1, vTexCoord).r) - sliderValues[1][0]) / sliderValues[1][1];
+  float channel2Color = (float(texture(channel2, vTexCoord).r) - sliderValues[2][0]) / sliderValues[2][1];
+  float channel3Color = (float(texture(channel3, vTexCoord).r) - sliderValues[3][0]) / sliderValues[3][1];
+  float channel4Color = (float(texture(channel4, vTexCoord).r) - sliderValues[4][0]) / sliderValues[4][1];
+  float channel5Color = (float(texture(channel5, vTexCoord).r) - sliderValues[5][0]) / sliderValues[5][1];
 
   vec3 rgbCombo = vec3(0.0);
   vec3 hsvCombo = vec3(0.0);
   float channelArray[6] = float[6](channel0Color, channel1Color, channel2Color, channel3Color, channel4Color, channel5Color);
   vec3 colorValues[6] = vec3[6](colorValue0, colorValue1, colorValue2, colorValue3, colorValue4, colorValue5);
 
-
   for(int i = 0; i < 6; i++) {
     hsvCombo = rgb2hsv(vec3(colorValues[i]));
     hsvCombo = vec3(hsvCombo.xy, channelArray[i]);
@@ -81,6 +80,5 @@ void main() {
   }
 
   color = vec4(rgbCombo, 1.0);
-
 }
 `;