public Builder setPixelFraction(float value) {

      pixelFraction_ = value;
      bitField0_ |= 0x00000004;
      onChanged();
      return this;
    }
<pre>
The fraction of pixels the color occupies in the image.
Value in range [0, 1].
</pre>

<code>float pixel_fraction = 3;</code>

@param value The pixelFraction to set.
@return This builder for chaining.
java-vision/proto-google-cloud-vision-v1/src/main/java/com/google/cloud/vision/v1/ColorInfo.java