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An ignore special ability is an ability that keeps its targets from targeting or being targeted by a specified set of cards. It also allows a character using an ignore ability to win a battle regardless of normal battle conditions.
If that were the case, then if I'm ignoring crimson you shouldn't be able to play crimson evil enhancements even to affect things other than my ignoring Hero.
As Christian Soldier stated, the only difference between ignoring enhancements and ignoring characters is that ignored enhancements can enter battle. Otherwise, it works exactly the same: the numbers don't count against ignoring characters, the special abilities can't target ignoring characters, and ignoring characters can't target the enhancement. Ignored enhancements are not negated, so Stone Cut Without Hands does not negate Great Image. However, the way it is worded, "Holder" is an older term for "you", and "you" ignoring something doesn't make sense in the current rules. Thus it should probably have errata to say "Your Heroes ignore Great Image", which is probably the closest interpretation of the ability. On the other hand, the Warriors Helmet of Salvation "Hero ignores Confusion" does nothing substantive, unless Confusion is ever reprinted to have numbers or a special ability that can target a Hero. Michal does ignore Scorn of Michal (apparently...lol) but as has been stated, all that means is that the numbers don't affect the battle. The ability still works, as it isn't trying to target Michal.
Tune in next time to watch someone explain Tartaros! Spoiler (hover to show)No one knows actually how Tartaros works, and no one has in over a decade.