Cr a33f

The banana flour color was measured by the instrumental measurement in triplicate using a Chroma Meter (CR-400/410, KONICA MINOLTA, Japan). Before getting the reading, the chroma meter was accurately calibrated using a standard white reference tile. The samples were collected and placed on top of a Glass Light-Projection tube (CR-A33f, Konica Minolta, Japan) while the reading was obtained. According to the Chroma meter, the L axis represented lightness (If, L* = 0; black and L* = 100; white). The redness to greenness was displayed on the a-axis as (if, a*-value = +a*; redder and a*-value = -a*; greener). However, the b*-value showed a change in color from yellow to blue (if b*-value = +b*, yellower, and b*-value = - b*, bluer).

The color of dried liver samples was measured by determining the CIE L*, a* and b* color parameters, with L* representing the lightness on a scale of 0 (dark) to 100 (white); a* the redness-greenness value; and b* the yellowness-blueness value, using a Minolta Chroma Meter CR-300 with a CR-A33f glass light projection tube (Minolta Co, Ltd., Osaka, Japan). The measurements were taken using diffuse illumination, a D65 light source, and 2° standard observer. The colorimeter was calibrated using a standard white ceramic plate (L* = 97.15, a* = −5.28 and b* = +7.82). The color of each sample was measured in triplicate. The angular coordinates of chroma (C*) and hue angle (H°) were calculated according to Equations (4) and (5), respectively.
$$\mathit{C}*=\sqrt{{(\mathit{a}*}^2{+\mathit{b}*}^2)}$$
$${\mathit{H}}^{\mathrm{o}}={\tan }^{-1}\left(\frac{\mathrm{b}*}{\mathrm{a}*}\right)$$