# Taking a Measurement (Surface Brilliance)
# How to measure sparkle and Graininess

The measurement button is used to start single or multiple measurment that are sent directly to the table.
1. Calibrate the sensor
2. To access the multiple readings feature, right click on the measurement button.
2. Press the measurement button to start.
<img src="Measurement button.png" width="100"/>

# How to measure sparkle and graininess on surfaces using the interactive measurement feature
The interactive measurement function is a "live" view of the sample surface. It is used to identify particular areas of interest when measuring surface brilliance.

## Measurement Procedure

1. Ensure the sensor is calibrated.
2. Press the button (1) to activate the interactive measurement feature.
<img src="Interactive button.png" width="100"/>
![gloss interpretation 2](gloss interpretation 2.png)
3. Use the auto-exposure button to optimize the camera exposure for the surface's reflectivity.
4. Manually adjust exposure if needed using the slider or input box.
6. The red dashed area on the live display indicates the target measurement area for gloss.
7. If measuring a curved or uneven surface ensure the gloss peak (3) is centered in the red dashed box (2) by changing the alignment of the sample or sensor.
8. To measure the gloss of an identified area on the surface move the sensor until the required area is enclosed by the correct red ellipse (4 & 5). 

<note> Adjusting the exposure settings do not affect measurements. This control is used to get a clear surface or gloss image for positioning purposes.</note>



 The reflected gloss image on this high gloss coating is intense and sharp & positioned centrally for an accurate gloss measurement. 

The surface image shows the area on the surface where the gloss is measured (4- measurement area for standard gloss adaptor & 5- Small area/ curved surface adaptor)

<note> Appearance Elements automatically corrects for minor sample misalignment, if the gloss peak is within the central region (6) gloss measurement will be accurate. </note>

![Gloss interpretation 1](gloss interpretation 1.png)

The gloss peak for matt and semi-gloss surfaces is less distinct, for alignment purposes ensure the brightest part of the image is within the red square (2).

Matt surfaces will reflect a image without a peak, alignment is less critical for these surfaces, ensure the camera sesnor is evenly lit before taking a measurment.  
