Welcome to Kleebz Tech and another video in our
Fooocus for Stable Diffusion series. In this one, I'm going to be discussing negative
prompts and if they have much of an impact. Do you really need those super
giant long negative prompts. I'm also going to give you a tip on how to endlessly,
continuously generate images. Don't miss my other videos covering all aspects of Fooocus
from installation to poses and face swap. The reason I'm talking about negative prompts is
that I see a lot of people put a lot of effort or focus into that negative prompt. The idea of a
negative prompt is if you don't want something, you put it in there, and you're less likely
to get it. The problem is with that is it seems to be somewhat hit or miss. At first,
I thought it wasn't really having barely any impact at all because I'd put things in there,
and it just wouldn't have any effect on it. So, I did some more testing today. I've been
doing some testing over the last week to try to narrow down to get an idea of what's
happening with the negative prompt. I'm going to show you some examples, and I will actually
show some things work and some things don't. So, the first one I'm going to show, for example,
is a woman walking in the rain. Now, this was actually the first one I had run into. So, I'm
going to have this set on speed. I'm going to just do two images, nothing in the negative prompt.
I'm going to use the same seed on this one. My styles and everything are all set to standard. I
did test this with style enabled and disabled. I didn't see any major impact by having the styles,
but I would assume that it could have some impact, but I didn't find any major impacts by changing
the styles or anything like that when it came to the negative prompt. But for some things, that
could have an impact because if your negative prompt is fighting against your style, then that
would definitely have some impact. But for my testing purposes, I concentrated on certain things
that wouldn't have anything to do with the style. So, this one, let's go ahead and generate a woman
walking in the rain. Now, one of the problems I came into whenever I generated these is I'd
always get a woman walking in the rain or a man or whatever with an umbrella, always umbrellas,
even though I don't want an umbrella. I'd always get an umbrella. We have our two women walking in
the rain, and both of them have umbrellas. Now, you'd say, okay, that's just two images. I've
actually tested this with about 100 images. I did multiple variations, probably about a thousand
images in total. And one tip I will give you, since I'm on the subject, is if you
ever want to generate endless images, you can right-click and generate forever,
and it will generate those images forever. For this one, we're going to now let's say I don't
want an umbrella because that's the big thing. I'm going to just put that in the negative prompt,
and now we're going to generate again. In theory, if I put it in the negative prompt, I don't want
it, so hopefully, I shouldn't get it. Of course, hope is a big thing when it comes to Stable
Diffusion or any of the image generations; there's a lot of hope involved in
what you're going to get for results. And we have our women walking in the rain, and
they still have umbrellas. If we actually look at the images, you'll see that almost nothing has
changed. There might be some very slight changes if you really look at them, like if you look at
the feet, those have changed very slightly, but it's not having any big impact on that image, and
it definitely is not getting rid of that umbrella. So, the next thing we can do is actually
try increasing the weight of "umbrella" in the negative prompt. As we've mentioned
with the prompts and negative prompts, the weight emphasizes it more or less. So,
we're going to tell that we really don't want an umbrella. I'm going to put that as 1.5.
And just to let you know, in my last tutorial, I had talked about using the control and plus
up and down arrow to increase and lower the weight. When you go back to adjust that, you
don't actually have to highlight the word; you can just click anywhere in there.
You can just hit control up and down, as a few people have mentioned in the comments,
so you don't have to select the whole thing. So now, we're going to go ahead and generate
this without an umbrella. Now, we've stressed here that we really, really, really don't want
the umbrella. So, you're going to think, okay, we're not going to get an umbrella, but I'd be
willing to bet when I hit this generate button, we're getting umbrellas. Because I've actually
generated hundreds of images for this ahead of time to test if this would work or not.
And I've tried different variations, I've tried with styles, without styles, you name
it. And I didn't find any drastic differences when it came to the styles enabling
or disabling. I did get some different results but not enough to determine that the
styles had an impact on that negative prompt. Now, I'd imagine certain things, if it was in the
negative prompt, and then you had it in the style, then it would definitely have an impact
on it. So that would be something to consider. But obviously, no style is going
to have "umbrella" in it. I wouldn't imagine there's any "umbrella" style, but if there
was, then that probably would be an issue. And again, let's pull up these images for
comparison, and we have all three of our images. We start off with just walking
in the rain, all the way to walking in the rain and no umbrella in the negative
prompt and heavily weighted. Very little differences between these images, and I saw
that consistently when I went through and did a lot of testing with this. You wouldn't really
get, I mean, you can see the difference in the images. There are very slight differences,
but it still doesn't affect that umbrella. Anything you put in the negative prompt is
going to have some sort of effect, and that's why I say you don't really want to have anything
in there that you don't need. So, in this case, I would say, why would I be putting "umbrella"
in there? Because it's not going to probably have any impact. I can tell you that right now by
looking at all these images that I've generated. They almost always produce with umbrellas. So to
me, that would tell me that I don't need to waste my time putting "umbrella" in the prompt.So, is
it worth putting anything in the negative prompt? Well, that really depends on what you're doing. I
did some testing with houses and trees. This is a similar test; I did a lot of images here and the
same seed. The one on the left had just a house on a hill, I think is what it was, and then
the other one was the same prompt, same seed, and I had put "trees" heavily weighted into the
negative prompt. Obviously, it had no impact as far as the trees were concerned. It did change
the image slightly, but it didn't reduce the trees that I wanted, so that really isn't going to help
there. Why even have it in the negative prompt? The question is, how do you solve that
if you can't remove something? Well, you try to push it in the regular prompt.
You might say "an empty house on a hill, an empty field" to get no trees instead of
putting the trees in the negative prompt. So when you run into things that don't work
in the negative, try to change the positive to push that. I haven't been able to do that
necessarily with the woman walking in the rain, but it's a lot easier with some of
the other ones that I've tested. I'm not going to say that the negative
prompt has no impact because, in my testing, I have discovered it does have an
impact. It actually does definitely have an impact on certain things, and
that's why I say it's worth testing. Let's do a woman reading a book. So, we're
going to do four images here because I just want to get a little bit of variation,
and I'm just going to use that seed, just so I don't forget to uncheck it. I'm
going to go ahead and generate four images. Okay, so we have our women reading a book. Now,
one thing we're going to notice is almost all these women are pretty much darker hair, which
actually works out for what I'm going to test here. So, I'm going to put a negative prompt in
here of "brunette, brown hair, black hair, dark hair" because I want these to be lighter-colored
hair. Now, obviously, I could put a specific hair color; that is one option if I want a certain
hair color, but I was trying to find what works and what doesn't work with the negative. Let
me show you what the results are with this. Okay, so we have our generated images. Now,
we want to see if there's any impact on these compared to the previous ones. If we look at
these two, you can actually see the hair is a little bit lighter in the second one than
it is in the first one, and in this one, slightly lighter but not drastically different.
Pretty much if we go through them all, it made the hair a little bit lighter
but not drastically so. That definitely does have an impact compared to what
the umbrella had no impact whatsoever. Now, the question would be if we add weight
to these, are these now still going to have an impact, or is that going to change anything
at all? Because with my other testing with trees and with the umbrella, nothing seemed
to impact it when I changed the weight. I think you can already tell that there
was definitely some impact on the results. Let's pull up these images. This is our
first one we had, and our second one, and then our third one. This actually demonstrates
pretty well the difference how the negative prompt is impacting this. Obviously, as we can see, it is
having an impact. My first assumption was that the negative prompt wasn't impacting anything the way
it should be, but in my testing, it definitely, in these circumstances, the negative prompt
does work for some things. It doesn't work well for other things, so some things are kind of
pointless. So, hair color, I would definitely say, would be useful to have in that prompt if you
feel you need it and don't want to specify a certain one. The other ones like trees, umbrella,
those didn't have any impact that I could find, or at least the any impact that we were I was
expecting. Hair length, I tested a little bit; I couldn't find any difference with hair length.
I really suggest before throwing things into that negative prompt, test to see if it actually has
an impact on it. The biggest way, as mentioned, is to use the same seed. That will at least
allow you to look for it and figure out what you should be putting in that negative prompt and
not overloading it with things because everything you add to a prompt or negative prompt will have
some sort of impact. It may not have the impact you're expecting, so I always suggest never to
put anything in there that you don't need. The shorter the prompts or negative prompts,
the better they are. I honestly don't use the negative prompt an awful lot unless I really,
really need it for something, but in most cases, I find it's pretty rare that I've actually
needed to put much in that negative prompt. One thing I do want to mention when I mentioned
previously about right-clicking on the generate button to get generate forever, do keep in mind
you do not want to do that if you have this unchecked and a set seed. Because what this does
when you right-click and hit generate forever, it'll do where I have four images selected here,
it'll do those four images and then it will reset and do four more and then reset and do four
more. If I have it set on the same seed, I'm going to keep getting the exact same four images.
So you definitely don't want to do that, generate forever, when you're using the exact same seed.
Then you want to have it random, and then you can set it to whatever you want at that point, and
then it will just keep cycling through that batch. I think I have covered what I wanted to show when
it comes to negative prompts. It really comes down to each; some things work, some things don't. Try
it out, and it really comes down to continuously testing things. Whenever you're experimenting
or trying something new, use that same seed. If you found this video helpful, please do consider
clicking the like button because it does help. In questions or suggestion for video ideas, please
leave a comment. Thanks for watching, and don't forget that I do have other videos on Fooocus, and
we'll have more in the future. Have a great day.
