Farhad Ameri

Farhad Ameri
Institute for Color Science and Technology | ICST · color physics

Dr.

About

26
Publications
9,589
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
108
Citations
Introduction
Farhad Ameri currently works at the color physics group, Institute for Color Science and Technology (ICST). Farhad does research in color science and technology. His most recent publication is "Development of a perceptually uniform physical scale for visual assessment of specular gloss".
Additional affiliations
August 2007 - September 2013
Institute for Color Science and Technology
Position
  • head of color physics group

Publications

Publications (26)
Article
Full-text available
K/S and reflectance graphs are essential tools in characterizing the dyeing behavior. In textile coloration, estimating the dye concentration is poor using the Kubelka-Munk model due to its low scalability and deviation of the reflectance function from linearity after low dye concentrations, particularly in the wavelengths where the gradient ofK/S...
Article
Full-text available
Measuring gloss, visually or instrumentally, has been a challenge in many manufacturing and service industries. However, there exists no standardized method for visual evaluation of equidistance specular gloss. This study aimed to design and prepare a psychometric visually equispaced specular gloss scale for the visual measurement of gloss or any o...
Article
The aim of the present study was to investigate the effect of color attributes of appearance on the corresponding geometric attributes of appearance of non-effect coatings. Three scales, namely gloss, distinctness of image, and orange peel for three achromatic (black, gray, and white) and four chromatic (red, green, blue, and yellow) basecoats, eac...
Article
The aim of this study was to quantify orange-peel texture with an instrumentally based single-number index highly correlated with equivalent visual assessments. We prepared 3 achromatic (black, grey, and white) and 4 chromatic (red, green, blue, and yellow) scales, each with 8 different levels of orange-peel texture. Each scale had a sample with a...
Article
Full-text available
Attempts were made to evaluate mathematically and empirically the accuracy of the Kubelka–Munk model for color match prediction of opaque and translucent surface coatings in the color using industries. To this end, an innovative inversed mathematical evaluation procedure was concocted which comprised of plotting the absorption and scattering consta...
Article
In this paper, the perceived blackness of 10 specific automotive finishes with different levels of orange peel attribute is investigated under the diffuse illumination condition. Since the purchased ACT black panels had approximately the same colorimetric attributes, i.e., lightness, hue, and chroma, the effect of colorimetric properties on perceiv...
Article
Full-text available
In the present study, attempts were made to clarify the existence of a correlation between visually perceived and instrumentally measured specular gloss of a series of achromatic samples. To this end, seven achromatic physical scales of specular gloss each consisting of 10 or 11 samples were prepared using lithographically printed black, white, and...
Article
The blackness perception of six black automotive finishes was evaluated under three different illumination conditions: unidirectional illumination, diffuse illumination and light booth condition. The metallic black panels with approximately the same appearance attributes, specular gloss, distinctness of image and orange peel, were selected to minim...
Article
Full-text available
The aim of the present study was to evaluate the effect of two fluoride varnishes on color stability of three resin-based restorative materials. Fifty-four discs (14.5 × 1.7 mm) were fabricated from A2 and A3 shades of a compomer (F2000), a flowable composite (Z350), and a hybrid composite (Z250), and incubated at 37°C for 48 h. Dura Shield (colore...
Article
Full-text available
In the present study, attempts were made to develop an index of geometric appearance capable of accurately predicting and quantifying the visually perceived geometric aspects of appearance of achromatic automotive finishes. To this end, three previously prepared individual scales for the three most significant geometric appearance attributes, namel...
Article
Full-text available
Appearance control has continuously been a major challenge to the automotive industry. In order to implement a consistent control on the appearance of automotive finishes, objective measurement of various appearance attributes such as gloss, distinctness of image, orange peel, etc., is indispensable to the auto-motive manufacturers. In the present...
Article
In the present investigation, the effectiveness of “Structure Balance Index” in correctly predicting the appearance of visually assessed achromatic automotive finishes was evaluated. For visual evaluation, the pair comparison method utilizing 16 observers assessing in a light cabinet, having a 45/0° viewing geometry, was used. The statistical resul...
Article
Full-text available
In the present study, attempts were made to develop an index of geometric appearance capable of accurately predicting and quantifying the visually perceived geometric aspects of appearance of achromatic automotive finishes. To this end, three previously prepared individual scales for the three most significant geometric appearance attributes, namel...
Article
In this work, acceptable tolerance regions for the most important geometric appearance attributes in the automotive industry, namely specular gloss, distinctness of image (DOI) and orange peel were determined. The visual assessment experiments were performed based on an acceptability procedure. Using the results of such visual assessments, acceptab...
Conference Paper
Full-text available
Illumination conditions and viewing geometries have an effective role in assessing the appearance of automotive finishes, leading to different results in total appearance investigation. In this research, the most significant geometric appearance attributes such as specular gloss, distinctness of image and orange peel of a metallic black automotive...
Article
Full-text available
Attempts were made to modify polypropylene fibers by melt blending with polyethylene terephthalate in order to enhance the dyeability of the resultant fiber. Five blends of polypropylene/polyethylene terephthalate/compatibilizer were prepared and subsequently spun into fibers. Three disperse dyes were used to dye such modified fibers at boiling and...
Conference Paper
Objective: The present in vitro study determined color changes following coating with a colored fluoride varnish (i.e. Durashield (Sultan, USA)) and a colorless one (i.e. Fluor Protector (Ivoclar Vivadent AG, FL-9494 Schaan/Liechtenstein)) on A2 and A3 shades of flowable composite Filtek Z350 (3M ESPE), Compomer F2000 (3M ESPE) and Composite Resin...
Data
Artificial opals are a division of photonic crystals composed of monodispersed nano particles. In this work, a polymeric dispersion with a core-shell structure was pre-pared by semi-continuous emulsion polymerization. The dispersion consisted of polystyrene-based hard core coated with a poly methyl methacrylate-co-butyl acrylate shell. Particle siz...
Article
Different industries are usually faced with computer color matching as an important problem. The most famous formula, which is commonly used for recipe prediction is based on the Kubelka-Munk (K-M) theory. Considering that spectrophotometer’s geometry and its situation influence the measured spectral values, the performance of this method can be af...
Article
Full-text available
Photonic crystals are attracting a lot of attention due to their ability to manipulate and guide the light. Sandwiching 3-dimensional styrene-based photonic crystals between polymeric multi-layer films such as polystyrene and polymethyl methacrylate is reported in this article. Polystyrene and polymethyl methacrylate solutions and a suspension of p...
Data
A spin-casting machine was designed and fabricated for preparation of multilayer polymer films from parent polymer sol-utions together with a polymeric dispersion of nanoparticles. The dispersion consists of polystyrene (PS)-based core coated with a poly(methyl methacrylate-co-butyl acrylate) shell. Multilayer structure of such films was confirmed...
Article
In this investigation, we attempted to enhance the dyeability of polypropylene (PP) with disperse dyestuffs without adversely affecting its tensile properties. To this end, a special cubic experimental design was used to predict the effect of variations in the properties of a tricomponent mixture composed of PP, poly(ethylene terephthalate) (PET),...
Conference Paper
Full-text available
This study aimed at using an image processing technique to investigate numerical estimation of the residual eare of coatings film after a pull-off test. The priliminary results illustrate good condition between this technique and the usual visual assessment method for limited number of samples.
Article
Full-text available
Attempts have been made to use different transformed reflectance functions as input for a fixed genetically optimized neural network match prediction system. Two different sets of data depicting dyed samples of known recipes but metameric to each other were used to train and test the network. All the transformed and untransformed reflectance functi...
Article
Full-text available
In the present investigation attempts were made for the first time to use the fundamental color stimulus as the input for a fixed optimized neural network match prediction system. Four sets of data having different origins (i.e. different substrate, different colorant sets and different dyeing procedures) were used to train and test the performance...

Network

Cited By