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Fig. 2 (a) Accuracy of answers monitored for groups of stimuli with particular legend position
(I-VI). The highest accuracy (79 %) was observed for the design IV. (b) Accuracy of answers
monitored for groups of stimuli with particular colour distance between colour scheme classes
(2-10). The accuracy increases with increasing colour distance. The highest accuracy (82 %) was
observed for groups of stimuli with
10. (c) Accuracy of answers monitored for groups of
stimuli with particular class to match (A-F). It is evident that the most troublemaking are classes in
the middle of the colour scheme (C and D). (d) Accuracy of answers according to the colour
distance (2-10) and class of the colour scheme (A-F). Regardless the colour distance the lightest
class (A) is always easier to match. Lower accuracy on
E 00
Δ
¼
central
classes is evident in all schemes
'
'
colour schemes, 18 more stimuli were prepared: 6 for each of 4-8-10-8-4, 6-8-10-8-
6 and 2-4-6-8-10-12 schemes (numbers corresponds to the colour distance between
classes from the lightest to the darkest). Examination was done only with the
composition IV. Technical description of colour schemes was already given
above (Table 1b ).
The best accuracy was observed for the colour scheme 4-8-10-8-4 (see the
Fig. 3a ). The average accuracy was in this case 93 %. Next two optimised colour
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