It would seem to be correct. The following is an extract the Nature Journal's archive:
For example, in a building camouflaged with large irregular patches of
colour, the actual outline of the building may be lost in the jumble
of these patterns. But the colour-blind person may be scarcely
conscious of the variegated colours, so that to him the outline of the
building may be almost unaffected by the camouflage. In the Ishihara
test for colourblindness, certain of the cards actually use this
principle; a faint blue figure is printed on a background of highly
coloured dots of various hues. To the normal observer the blue figure
is lost against the background, but the colour-blind person may spot
it. Again, in the protanopic and protanomalous type of defect, reds
and yellows appear darker than usual, and with certain colouring of
building and background this could lead to an enhanced contrast and so
give the colour-blind person his advantage.
The following are extracts taken from a BBC article:
The Cambridge team tested this idea by asking deuteranomalous and
"colour-normal" individuals to report whether they were able to
distinguish between pairs of colours that were theoretically predicted
to look different to people with deuteranomalous colour blindness, but
the same to those with normal colour vision.
The researchers duly found some colour pairs were only seen to be
different by deuteranomalous individuals.
In fact, the researchers found people with deuteranomalous colour
blindness gave large difference ratings to pairs of colours which
appeared indistinguishable to others.
The researchers, led by Dr John Mollon, said: "The present findings
recall reports from the Second World War, which suggested that 'colour
blind' observers might be superior in penetrating camouflage."
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