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The alpha Centauri pair do look yellowish to me. Sometimes colour can look different in binoculars, different types of scopes (refractor or Dob) or using different EPs.
Canopus does look white. Its spectral type is F0. I would expect it to look white (more on that below).
Apart from the limitations of colour perception at night, you need to expand your ideas on spectral class.
Each spectral class is subdivided from 0 to 9 (e.g. G0, G1 ... G9) and sometimes divided further again e.g. M1.5. Change in colour is on a continuum. Yellow does not change into orange at a discrete point. The centre of each class is more representative of the colour assigned to that class. Thus, a G8 or G9 spectral type star is not so different from a K0 or K1 type star. They will all appear yellow. Antares (M1.5) and Betelgeuse (M1-M2) are not that much different from a K8, K9 type star i.e. they appear orange.
Regards, Rob
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