With the rapid growth of photo-inkjet printers using sixcolorant in response to the spread of digital and mobile cameras, there has been a lot of research regarding six-color separation in order to achieve visually smooth tones in highlight regions. Most conventional method use the maximum amount of colorant with a low dot-visibility, thus resulting in paper wetness, poor edgesharpness, and ink...

Organic colorants of textiles found in the female burial Lieto Ristinpelto, SW Finland, were analyzed by HPLC-PDA. The textiles’ visible colors varied from different brownish shades to blueish, greenish, and reddish hues. aim chromatographic analysis was deepen current understandings dyes used Finland at transition between 12th 13th centuries AD, i.e., beginning local Medieval period, contribut...

c d i d t s p T l b c bstract. This paper proposes a method of six-color separation sing additional colorants and a quantitative granularity metric to educe the color difference and graininess. In conventional six-color eparation, the use of light magenta and light cyan is generally an ffective way of reducing the visibility of dots in bilevel printing deices, i.e., light magenta and light cyan...

The analysis of paint cross-sections can reveal a remarkable amount of information about the layers and materials in a painting without visibly altering the artwork. Although a variety of analytical approaches are used to detect inorganic pigments as well as organic binders, proteins, and lipids in cross-sections, they do not provide for the unambiguous identification of natural, organic colora...

BACKGROUND The ultraviolet properties of textiles dyed with synthetic dyes have been widely reported in literature. However, no study has investigated the ultraviolet properties of natural fabrics dyed with natural colorants. This study reports the Ultraviolet Protection Factor (UPF) of cotton fabrics dyed with colorants of plant and insect origins. METHODS Three cotton fabrics were dyed with...

We propose a novel scanner characterization approach for applications requiring color measurement of hardcopy output in printer calibration, characterization, and diagnostic applications. It is assumed that a typical printed medium comprises the three basic colorants C, M, Y. The proposed method is particularly advantageous when additional colorants are used in the print (e.g. black (K)). A fam...

SUMITOMO KAGAKU 2013 through each color filter for each pixel instantaneously by a liquid crystal shutter. Improving the brightness of color filters comes down to improving the brightness of each pixel,3) in other words, improving the transmittance of color resists, which are the materials that form the pixels. In addition to resist components, color resists have colorants mixed in, and color p...

A s Leona notes in a recent issue of PNAS (1), art and objects of cultural heritage hold information about the technology, trade, and aesthetics of a people. This knowledge can be accessed through chemical and material analysis combined with an understanding of the history of technology, science, and art. The information learned is of great value, especially for ancient objects that are so old ...