For loop : mixing iterator with argument of a function

General Usage
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2

The way you programmatically access properties is with getproperty, which accepts Symbols.
I.e., ColorSchemes.PiYG_1 === getproperty(ColorSchemes, :PiYG_1).
So you can do:

for i in 4:6
    scheme = getproperty(ColorSchemes, Symbol("PiYG_$i"))
    convertedimage_i = convert_to_scheme(scheme, img_rgb)
    IJulia.display(convertedimage_i)
end
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