BS in Graphic Communication
Graphic Communication Department
In this study the effects of optical brightening agents (OBAs) on color reproduction in digital toner-based printing are explored. Through the comparison of two distinct substrates with different levels of OBAs, notable differences in the reflectance of blue light in the visible light spectrum are analyzed among light sources Illuminant A, D50, and D65. Fluorescence occurs in OBA paper under light with a UV component; between D65 and Illuminant A light sources there is a distinct difference in fluorescing effect of the sample substrates. Color discrepancy as a result of OBAs is analyzed between D50 and Illuminant A light sources, which are common to pressroom viewing conditions and customer environments. For toner-based digital printing, greater difference in color occurs between light sources when there is a lower percent coverage of ink on the paper. Though most color discrepancy is notable, color-matching issues in the digital environment as a result of OBAs in paper may not be a chief concern unless a press is not calibrated or if substrates are drastically different in OBA levels.