uniform sampler2D inputImage;
uniform float threshold;
uniform vec4 mask_color;
uniform vec4 target_color;
uniform float hueTol;
uniform float hueMinBracket;
uniform float hueMaxBracket;
uniform float satTol;
uniform float satMinBracket;
uniform float satMaxBracket;
uniform float valTol;
uniform float valMinBracket;
uniform float valMaxBracket;
uniform float dilate;