OK. And I suppose there's no workaround unless you revert back to the uncorrected look? 

I'm so excited for this mankrip

quake in its intended 256 colour brilliance. 

this is pretty darn sweet. 

Exactly. The only workaround would be to convert the whole renderer to 24-bit color, which is what the Pixomatic software renderer in Unreal Tournament 2004 did. 

Which map are these pics taken from, BTW? I don't recognize it. 

Can't wait to start experiencing that by myself too* so this is your own engine project? 

Mugwump: It's Clean Cut, by MFX.

NewHouse: Yes. 

Haven't played that one yet. 

 

Qmaster: The name is Retroquad, but it may change before release. 

Just found this - might be useful for you:
http://bisqwit.iki.fi/story/howto/dither/jy/#Appendix%201GammaCorrection 

Take a look at the whole article. I pasted a link with redirection to "Gamma correction" by mistake, which is least interesting part of this page. 

Thanks, I've read all of it (minus the code, because I'm on a smartphone atm).

So far I've not used any iterative color search methods, only straightforward calculations. But that article may give me some ideas on how to improve TGA skyboxes and external textures. Skyboxes such as "Interstellar" and "Violent Days" still looks pretty bad in Retroquad.

Another idea on how to improve external textures is to perform topological analysis to scale the error diffusion in a non-linear way. This is in my mental list of things to try sometime. 

 

As mentioned before, this is the best result I had achieved.

But after testing the translucency on several maps, I've had one more idea.

Now I've modified the gamma correction algorithm on the blending, turning it into adaptative gamma-correct blending. This helped to give the resulting image an even more natural look, with even more details being recognizable now. Both this screenshot and the previous one were taken with exactly the same settings (r_slime_blend_alpha 0.6; r_wateralpha 0.5). 

Thoughts?

I want to use a skybox in my map (before now it was regular boring old blue sky) but i'm struggling to find the right one that matches with the lighting. I think this one kind of works. Any ideas for other good ones?

Also, it's alright for me to use it, right? It's taken from AD, but it's uncredited in the readme so yeah. I'm sure no one would really care if I did or not, but I still feel like I should be a responsible citizen and check first. 

Nice! I can't see any sieve effect on the glass anymore. 

Not bad. You should ask Sock if you wanna do this by the book. Check this page http://quakeone.com/forums/quake-help/general-help/10727-definitive-hd-replacement-content-list.html for links to a bunch of skyboxes. 

In Photoshop, I would pick the color in these rocks, invert it (Ctrl+I) and start from there. 

Interesting changes.

I notice a bit of graininess has crept in in the shadows. You're able to recover quite a bit of detail on the crates, where prior they were almost flat.

Is there a method you could apply to selectively remove dithering where it is going to appear grainy?

The areas in particular I'm thinking are where the biggest shadows are, or will that ruin the glass transparency effect? 

Is there a method you could apply to selectively remove dithering where it is going to appear grainy?

No. But while playing the game, the grainyness isn't as noticeable. The area in those screenshots is a worst case scenario, translucency effects usually looks better than that already. 

So I pasted the id metal skull texture over some fucked up overlapping brushes and it resulted in this weird conjoined twins effect where the overlap occurs. I think I'm going to keep it.

http://www.quaketastic.com/files/conjoinedskulltex.PNG 

It looks cool but the effect is only in this particular place. All other skulls look normal. Now you need to fuck up the rest of your wall! xD 

That's Quake's normal "natural" texture alignment. You'll have to scale/shift the texture on the angled wall if you want to fix it. Even if the alignment looks okay, I sometimes still scale so that the pixels aren't stretched. Depends on how noticeable it is. 

I think I'll keep it, it's only in one other place but it's amusing to me. Who knows if it'll be noticeable once the map is lit.

Anyway, here's a speedmapped layout I think I'll make into Qonquer map (originally supposed to be a coagula level). Might make a whole pack of these for kicks. Dunno how the rest of the community feels but imo there aren't enough good Qonquer layouts.

http://www.quaketastic.com/files/qonquermet.PNG