Evaluation of two procedures for color measurement in pigmented maize grains
DOI:
https://doi.org/10.29312/remexca.v12i7.2276Keywords:
color reading, colorimeter, hue and chroma, luminosityAbstract
The maize grain with anthocyanin-type pigments does not present a homogeneous coloration on its surface, so the way the grain is presented to take the color reading affects the results. In this work, two ways of taking the color reading in samples of grain of different colors were compared. Grain samples of purple blue (PBL), cherry red (CR), brick red (BR), yellow (YE) and white (WHI), the latter as a control. The two procedures for measuring the coloration of the grain were: mounted on a base of plasticine, simulating the way it is on the cob (GMP) and grain in tray (GTR). The color was determined with a Hunter-Lab Mini Scan colorimeter. In the grain colors PBL, CR and BR, the procedure for taking the color reading affected the color variables. In PBL maize, the differences were present both in the luminosity and in hue and chroma, in the CR and BR, the hue variable was the most affected. In the YE and WHI maize grains, the values of luminosity, hue and chroma were numerically close between the two ways of taking the color reading in the grain. According to the results, in the maize PBL, CR and BR, the color should be taken in the GMP, to obtain values in the color variables, which are related to the visual appreciation of color, while in the maize with grain YE and WHI, the procedure for taking the reading, although it affects the color variables, the hue value corresponds to the visual appreciation of the color.
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