The game's dark skintones are lacking

That's what we need a color slider/wheel
In TS3 there's a special slider for skintone, there's 3 natural skintone slider: olive, bright, dull. I always think the olive skintone is a bit reddish for Asian sims(TS3 vampire has unique skintone, honestly their olive skintone is more similar to most of Asians). TS4 has "more olive" skintones, but even the second skintone(obvious olive) is more pale than those "white"(don't know this type's true name) skintones.

And I don't know why those dark skintone are... have strange effect on lipstick, even the most black lipstick won't so black

I haven't play TS4 for a long time, don't know if this fixed

I agree I feel that there is a lack of skin tones in general, at least good ones. The paler skin tones are way too yellow and the darker ones are too ashy, middle tones could have been a little better too, most of them makes your sim look sick. I generally just use one of the pale skin tones that look alright, but when I make a dark-skinned sim, I just pick one because I gave up on finding something that looks decent or realistic.

I don't really need a color wheel for furniture or other things, but a color wheel for skin tones would have been great for versatility for everyone, you could pick a skin tone that resembles yours, you could pick a skin tone that could work with any kind of fantasy character you have in mind. We are so limited with the premade skin tones.

I could also say the same about the hair colors, so a color wheel for that too would have been nice, but it's less important for me honestly.
One of the blondes are pretty much a waste of space, the black is sometimes more of a dark blue, I feel like there could have been more of a variety of browns, maybe a lighter brown.

There are always going to be things that could have been better.

But I hope that Maxis will consider fixing some of these things, especially the skin tones.
And if they do, I want them to use their time to make sure they look good.

I am honestly at this point shocked that for the base items like skin tone, hair color and basic clothing a HEX style color block hasn't been introduced that allows for finding subtle in between shades for skin tone especially. I can understand the limitations on walls, floors, and cloths with designs as the texture needs to be considered in the augmentation of pigments to ensure they look correct (color theory issues of some colors changing when put next to others)

And I do think the lighting plays a huge part of it. Many monitors gamers use are already "blue light" spectrum because of the LED or other back lighting technology it may be using his heavily reliant on blue to act as a modifier as red or green often create heavy conflict. Most technology functions in the RBG color spectrum which makes balancing a bit of a headache.

I saw a mod a few days back actually from one modder that was to correct the lighting in game to be more accurate. I wonder if such a mod or patch could be made for in game?

And back to the color theory thoughts - since it is a bright blue background it could have heavy impact on the tone of the skin as it is rendered because it effects it visually.

Can anyone who uses CAS get a modifer for their CAS screen and show comparison shots? I don't have the ability to post pictures yet.

Yeah I commented about this before the MAC update. I notice it has become an issue awhile. The clothing colors and wall colors are really ashy looking too. As someone who is a pyro Simmer, looks like the makeup, clothing, and wall colors have all been burnt in a fire.

I agree. I'm brown with warm undertones and trying to recreate myself or people I know in the game without CC means my sims either look racially ambiguous or ashy because the undertones on the darker skintones are awful. That same pinky-cool undertone is used, or a really weird red undertone, or just a grayed-out ashy skin. The fact that CAS is unplayable for me unless I use CC skins (xmiramira's melanin packs have saved me) and makeup is ridiculous.

These lookl weird. The first one is so orangey ! (She might have been wearing the new blush but it's barely noticeable anyway).

https://i.imgur.com/HFsAYZG.png
https://i.imgur.com/7Y9hHZK.png
https://i.imgur.com/O7T9TvO.png

Sadly agree, I don't really play with black sims so I hadn't noticed properly but I was trying to make some caribbean sims the other day and yikes it really is awful! The colors are either a "tan" type color or literal black-grey

I agree, the darker skintones are not good, some even have bad textures as Grimcookies pointed out in a video. And the new MAC makeup has bad textures on the darker skintones as well.