One is entitled not to be mislead on the color of what one is shown as much as is entitled not to be mislead on the shape of what one is shown.
One is repeated 3 times. Sounds redundant to me. Is it idiomatic?
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In BrE and most varieties of AmE, "one" acts as a full personal pronoun, so it cannot be replaced by "he" or "they":
One must do it oneself.
One should try not to lose one's keys.
Some AmE speakers permit an alternative construction in which, after the initial "one", the following instances can be replaced:
One must do it himself (or themselves).
One should try not to lose his (or their) keys.
In your example, you could get away with saying "is shown" in place of "one is shown", but the meaning would be slightly different (since one is no longer necessarily the person being shown). However, you need "as one is", not "as is".
One is entitled not to be mislead on the color of what one is shown as much as one is entitled not to be mislead on the shape of what one is shown.