|Testing Reveals Spatial Imaging Superior to Geometric Flux Assessments
for Distinctness of Image
An experiment performed by members of ASTM Subcommittee E12.14
on Multidimensional Characterization of Appearance revealed significant
findings. Subcommittee Chairman Paul Tannenbaum, research associate,
DuPont, Wilmington, Del., said that in a previous article in Standardization
News, the subcommittee outlined new visual experiments and instrumental
techniques currently under study, which will ultimately lead to
new standards for distinctness-of-image (doi) and orange peel
To date, he continued, we have determined that imaging (spatial)
technologies provide better correlation with visual assessment
than flux (geometric) assessments. In retrospect this should be
obvious since the attributes captured by the image are the same
ones we see, while in the geometric case we must infer the appearance
attribute(s) indirectly from change in flux as a function of angle.
The first set of experiments (visual and instrumental) were based
on a generic set of black ACT Laboratories orange peel panels.
The attribute steps for both doi and peel were fairly large and
distinguishable. For our second set of experiments we have developed
a number of new black panels where the steps in doi and peel are
much tighter. We wish to determine the point at which we obtain
just noticeable differences. Several members of our committee
are currently working on a protocol for the new experiment.
A visual experiment probing surface appearance effects will be
conducted at an ASTM booth at the AIC (International Colour Association), ISCC (Inter-Society
Color Council) Meeting, June 24-29, in Rochester N.Y. In the Convention
Center, volunteers will be asked to act as subjects while data
is collected by Subcommittee E12.14.
For further technical information, contact the subcommittee chair,
Paul M. Tannenbaum, DuPont, Experimental Station (phone: 302/ 695-4054). Committee
E12 meets June 19-22 in Rochester. For details, contact Staff Manager
Bode Hennegan, ASTM (phone: 610/ 832-9740).
The AIC meets in member countries every four years to promote
color-science developments. The 9th AIC Congress will be hosted
by the Inter-Society Color Council (ISCC) and coincides with the
ISCC Annual Meeting. For details, visit the ISCC Web site. //
Copyright 2001, ASTM