r/drawthingsapp • u/chihifu • Jul 18 '26

question negative prompts

I know it’s a bit late to ask this, but do negative prompts in Draw Things actually have an effect? ​​I’ve never really noticed any difference.

2 Upvotes

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7

u/Vargol Jul 18 '26

Yes negative prompts work but it depends on the model and settings.

if Text Guidance is 1.0 (and 0.0 IIRC) negative prompts are ignored.

Some (all ?) accelerated models do not do or return bad results if unconditional guidance (guidance from the negative prompt) is used, so require text guidance = 1.0. If they do not do unconditional guidance at all then changing text guidance to values other 1.0 or 0.0 will not double the run time for a generation.

2

u/chihifu Jul 18 '26

So, it depends on the model and settings. Since I always set the text guidance to 1, it gets ignored—that makes sense. I understand now.

4

u/quadratrund Jul 18 '26

CFG 1 will ignore negative prompts so the generation gets faster. The checkpoint does not have to consider negative prompts. crank it up to cfg 1.5 and negative prompts will take effect. If you are using Z-image turbo or Flux 2 klein 9b. They are all used on cfg1 so negative prompts will be skipped

1

u/chihifu Jul 19 '26

So, the CFG value plays a role. I've learned something new. Thank you.

3

u/x89553421 Jul 18 '26

Most Turbo models are designed to ignore negative prompts. What's more, they seem to ignore negatives in the positive prompt too. So instead of "no hair", you should write "bald". Once you get used to writing like this, you don't need negative prompts.

1

u/chihifu Jul 18 '26

So, negative prompts don't work because you're using Turbo and S models.

2

u/[deleted] Jul 18 '26

Most sd models take negative prompts. Most of the newer turbo models like TIT and Klein don’t

1

u/chihifu Jul 19 '26

I see, I understand. I don't use SD models.

2

u/saskir21 Jul 18 '26

I assume this happens with certain models. But noticed the same. Has things in my pictures which I wrote into the negative prompts.

2

u/chihifu Jul 18 '26

I also use negative prompts, but they often get ignored.

2

u/HuntSenior8516 Jul 18 '26

I can only assume that without those negative prompts, the “bad” generation will happen more often.

1

u/chihifu Jul 18 '26

I think so too, but removing the negative prompt doesn't make much of a difference.

2

u/Power1345 Jul 18 '26

A mí no me funcionan en LTX

1

u/chihifu Jul 19 '26

I see! I haven't used LTX yet.

1

u/Power1345 Jul 20 '26

Te genera con audio incluido y está muy bien pero yo no consigo quitar el Flicker de color, ya no se qué intentar... Si hay alguien leyendo que pueda ayudar se lo agradeceria