Data Collection

I did some research on Hue, Saturation and Brightness so as to make an informed decision as to which value I would use to plot the graphs. 

Reference to:
http://en.wikipedia.org/wiki/Hue
http://www.ncsu.edu/scivis/lessons/colormodels/color_models2.html

Hue: a colour or shade

Saturation: amount of grey in the colour

Brightness: whether the colour is dim or bright

Therefore, the most relevant value to my experiment would be hue. As can be seen on this screen shot of the Photoshop colour picker, Hue, denoted by H, is measured in degrees. All the hues can be found on the multi-coloured bar. The pointer is at the bottom-most colour, red, also known as 0°. The degree then increases as the pointer moves up the bar till it reaches 0°/360° again.

The process of collecting data from the photographs is long and hard. I met a few problems along the way, as listed below.

1. Sometimes the slices are flipped the wrong way round, and this makes it hard to make the data consistent all the time. I always try to take the readings from the exact same spot from the very beginning.

2. As I have to take data from the same slice of vegetable every time, I need to identify which slice is which. This proves to be quite difficult, especially for the spinach because the colour is quite dark, therefore making it hard to discern between the slices.

3. For the experiment conducted in Singapore, I used purple cabbage and spinach, but obviously they are not exactly the same as the ones I used in China. This thus makes the effect of the acids and alkalis different for the two experiments.

4. Also, the colour picker is quite sensitive and even slight changes in light conditions during photos taking may affect readings. I have tried, especially for the experiment in Singapore, to maintain the same lighting to achieve better accuracy in my data.

 The collected data will be coming up next!