kolorimetrie --- barvy

Accurate colour measurement is a very important factor to determine the quality of finished products in the colour-related industries, such as textiles, paint or printing. In the past, visual colour assessment was used to match colours and physical samples played an important role. In this research project, it was found that the drawback of the visual colour assessment is that, performance is influences by a number of parameters including psychological, medical and environmental factors.Often when someone has a visual defect, colour vision is one of the first parts to be affected. Farnsworth-Munsell 100-hue test is able to indicate the presence of visual defects [17]. During this study it was found that for people who generally have medical problem with their eyes, people who use spectacles scored a range of 40 to 68 errors, while for those who believe their eyes function properly scored a range of 8 to 36 errors.Evaluation of visual colour difference with a Greyscale Standard test method was developed to provide a precise procedure for colour difference for visually evaluation colour difference.[19] During this study 38% of the visual assessors gave the results with the correlation bellow 0.75, which is the minimum correlation.The spectrophotometer is one of the important instruments for colour matching and colour measurement. It performs at a finite level of accuracy but, as an electro-mechanical-optical device, it exhibits measurement errors relative to a theoretically error-free instrument that users must accept [19]. Most of the modern spectrophotometers have satisfactory repeatability and the suppliers of these instruments claim that the repeatability of the measurement on the same instrument, ?E is lower than 0.05 units. In this research it was found that the repeatability of advanced spectrophotometers ranges from ?E of 0.01 to 0.14 units.When considering the inter-instrumental agreement of different makes of spectrophotometers, the inter-instrumental agreement between spectrophotometers manufactured by different manufactures ?E range between 0.002 to 0.2 units.

Small color Difference Evaluation