Editing the colormap to add a new sky

[HotCoffee]

I'm trying to add my custom sky to vanilla doom but the problem is the sky uses a lot of colors that are not present in the doom palette so when I convert it with Slade I get a really ugly result that tries to use the closest color to the ones in my sky.

So I tried changing the "COLORMAP" lump: I exported it, replaced some colors with the ones the sky needs (I replaced the purple with the new colors because it is not often used anyways).

Then I re-imported the COLORMAP but I got the same result as before.

Also why when I convert an image in SLADE the preview is always wrong? The images will become black and white or a different way of how it will actually show in-game.

[esselfortium]

The actual colors used are defined in the PLAYPAL lump. COLORMAP defines how lighting is applied to those colors, and can only include colors that are already in PLAYPAL.

[ramon.dexter]

And no, modification of PLAYPAL is  not a good idea. You'll screw good amount of other graphic. 

You know, these and others are the edges of vanilla. You MUST use palleted image. 

Edited August 16, 2022 by ramon.dexter

[SMG_Man]

On 8/16/2022 at 5:49 AM, HotCoffee said:

Also why when I convert an image in SLADE the preview is always wrong? The images will become black and white or a different way of how it will actually show in-game.

 

It sounds like you have not told SLADE where your copy of the doom 2 WAD is. There should be an option like "Set Base Resource Archive" or something like that.

[maxmanium]

Yeah, you have to work with colors in the palette. You could make a custom palette, but there are a lot of things you need to keep in mind, like knowing what you can actually cut down from the stock Doom 2 palette as well as certain hardcoded indices for things like the automap.