text: #import "GPUImageFilter.h"
  
  @interface GPUImageFalseColorFilter : GPUImageFilter
  {
      GLint firstColorUniform, secondColorUniform;
  }
  
  // The first and second colors specify what colors replace the dark and light areas of the image, respectively. The defaults are (0.0, 0.0, 0.5) amd (1.0, 0.0, 0.0).
  @property(readwrite, nonatomic) GPUVector4 firstColor;
  @property(readwrite, nonatomic) GPUVector4 secondColor;
  
  - (void)setFirstColorRed:(GLfloat)redComponent green:(GLfloat)greenComponent blue:(GLfloat)blueComponent;
  - (void)setSecondColorRed:(GLfloat)redComponent green:(GLfloat)greenComponent blue:(GLfloat)blueComponent;
  
  @end
  