Primerjava vrednotenja barvnih razlik lesnih premazov s kolorimetrom in z vizualnim zaznavanjem : diplomski projekt

Demšar, Boris (author), Petrič, Marko (mentor), Pavlič, Matjaž (comentor), Kitek Kuzman, Manja (reviewer)

Ugotavljali smo razlike med občutljivostjo vizualnega zaznavanja barvnih razlik in numeričnega vrednotenja, na barvno različnih vzorcih. Pripravili smo 12 različnih parov površinskih sistemov- en vzorec od vsakega para smo shranili, drugega pa obsevali z UV svetlobo, da bi povečali razliko med barvama obeh vzorcev v paru. Vzorci so se med seboj razlikovali po vrsti in namembnosti podlage, premaznem sistemu, teksturi podlage ter dimenziji. Po vsakem obsevanju z UV svetlobo smo med seboj primerjali barvi vzorcev posameznega para. Anketirali smo vedno isti letnik študentov- ti so na anketnih lističih označili, kolikšna je barvna razlika, če je le-ta opazna. Po vsakem obsevanju pa smo barvo izmerili tudi s kolorimetrom, ter nato izračunali barvne razlike. Večinoma so anketiranci zaznali razliko barve le v primerih, ko je numerično vrednotena razlika barve %E* imela vrednosti v območju med 0,5 in 1,0. V nekaterih primerih so anketiranci spremembo barve komaj zaznali šele pri vrednostih %E* nad 3,0. To kaže, da sta zmožnost čutnega zaznavanja barvnih razlik in s kolorimetrom izmerjenih vrednosti %E* med seboj le šibko povezani, saj na čutno zaznavo barvne razlike vplivajo različne lastnosti površine, kot sta npr. sijaj in tekstura

• Language: Slovenian
• Keywords: lesni premazi, UV obsevanje, barvna razlika, vizualno zaznavanje, numerično vrednotenje
• Work type: Diploma project paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: BF - Biotechnical Faculty
• Place of publishing: Ljubljana
• Publisher: [B. Demšar]
• Year: 2015
• Number of pages: VIII, 39 f.
• PID: 20.500.12556/RUL-117700
• UDC: 674.07
• COBISS.SI-ID: 2457225
• Publication date in RUL: 22.07.2020

Secondary language

• Language: English
• Title: Comparison of evaluation colour differences of wood coatings with colorimeter and visual perception

Abstract

We evaluated distinctions between visual perception of colour differences and numerically determined colour differences in terms of the CIELAB %E* values.12 pairs of different surface system samples were prepared; a sample of each pair was kept in a dark, dry place and the other one exposed to UV light to increase the difference between colours of both samples in a pair. The samples varied in texture, dimensions, coating, substrate type and application purpose. A class of students evaluated colour differences after every exposure to UV light. The colours of all the samples were measured also with a colorimeter. In general, the respondents noticed the colour difference at the values of %E* between 0.5 and 1.0. However, in some cases, the respondents only hardly noticed the colour difference at the %E* values even above 3.0. This indicates that the ability of visual perception of a colour difference and the %E* value determined with a colorimeter, are only weakly related. This is probably because the visual perception of difference between colours is influenced by various surface properties like ,for instance, gloss and texture

• Keywords: wood coatings, UV light, colour difference, visual perception, numerical determination