(iii) Image processing. The entire image processing for
segmentation and color analysis was done with the
software Photoshop 7.0 (Adobe Systems Inc., San
Jose, USA). Image segmentation was done using the
magic wand tool from toolbox of Photoshop 7.0, the
whole image of the chips were selected and all the
pixels that are similar in color were selected (Papadakis
et al., 2000). The magic wand tool is allowed to