Styles: Fooocus V2 & Substyles
Like the other Styles, the Fooocus V2 style adds words to the prompt to help refine it. Each of these other styles are fairly short word lists and every word in the list is added to the prompt. So the standard styles add to the prompt in a very specific way.
In contrast, Fooocus V2 uses GPT-2 artificial intelligence (AI) to expand on the prompt by adding hopefully appropriate words from a dictionary of at least 642 entries. And in addition, randomness is introduced using the same seed used by the generative model. When using Fooocus V2, the generative process is actually functioning with two AI sources, the base model itself and the GPT-2 prompt expander.
The images in shown in this article all use the HyperFlux5 preset with the same seed, using the prompt "Doukhobor adult man", derived from the wildcards "ethnic grownup". At the top of the page is the control image that does not use Fooocus V2 - or any other styles.
Fooocus V2 can use alternative word lists called substyles which make it prompt expansion more suitable for certain genres. Substyle selection is straightforward. If Fooocus V2 has been selected from the Styles tab, a Fooocus V2 Substyle dropdown menu overlays the bottom of the styles list to enable substyle selection. And a few presets are associated with specific substyles. For example, the Magick preset defaults to using "Spellcasting Druid".
While Fooocus V2 can be effective in building a powerful image, it does have some drawbacks. While its purpose is to strengthen the main prompt there are times when it may take it in an undesirable direction. It can also reduce the effectiveness of other styles, although Fooocus V2 is always added to the prompt after any other styles so that its influence is somewhat reduced.
The original or "Default" substyle was designed to be generic, and often that is exactly what an image needs.
"Default" uses 642 words which represent 834 tokens. A token is a unique numeric code used in the GPT-2 master dictionary. For example, a word such as "towering" will cause the AI to search for all available variations on this word and supply them as tokens for processing. In the case of "towering" there are four variations in the master dictionary: "tower', "Tower", "towers" and "Towers". Including the actual word in the substyle that makes a total of five possible tokens. Most likely the listed word, "towering", will be chosen, but the other possibilities enrich the lexical resources available to the AI. This brings more diversity and flexibility to the prompt building process.
As listed in the image log, this is the Fooocus V2 Expansion for the image above:
"Doukhobor adult man, dramatic light, gorgeous, amazing, delicate, elegant, highly detailed, complex, artistic, sharp focus, fine detail, professional, winning, singular, best, creative, cool, unique, awesome, epic, stunning, cute, perfect, colorful, illuminated, pretty, attractive, pure, smart, focused, positive, loving, excellent"
This and all the other FooocusPlus substyles use
"Doukhobor adult man, urban exotic city, gorgeous atmosphere, perfect, cinematic, dynamic, wide, sharp focus, highly detailed, fine detail, intricate, elegant, complex, epic color, ambient, dramatic sky, professional, composed, vivid, beautiful, emotional, shiny, marvelous, awesome, creative, pure, wonderful, fancy, breathtaking, symmetry, amazing"
"Doukhobor adult man, Lovecraftian Damnation, cosmic horror, monster, eerie, evil, mist, magic, dark, gloomy, crystal, golden, detailed, very complex, extremely advanced fog, wizard, witch, cinematic light, incredible colors, painted, fine detail, polished, intricate, powerful, stone, artifact, glowing, strong, epic, forest"
"Doukhobor adult man, Sci-Fi, surreal, majestic, dramatic, intricate, elegant, sharp, digital engine, steam, epic composition, android, detailed, cinematic, dynamic, full moon, New fascinating city, star, planet, metal, shiny, colorful, light, dark, determined, creative, amazing, beautiful, attractive, delicate, cool, charming"
"Doukhobor adult man, Spellcasting Druid, Gold Ring, decorative magic crystal, field background, beautiful dynamic dramatic bright rainy atmosphere, cinematic lightning, storm, night, spring, realistic, golden, detailed, clay, focused, extremely, highly, majestic, artistic, nature, scenic, wool, rough, painted, pattern, light, legend, lore, wide open"
"Doukhobor adult man, Victorian Steampunk, oil engineering intricate, metal, brass, leather, steam, gears, cart, glowing, dramatic, lens, detailed, excellent composition, cinematic dystopian vibrant colors, dynamic serious atmosphere, artistic, very inspirational, stunning, inspiring, creative, realistic, gorgeous, color, highly detail, incredible quality, inspired, rich vivid colorful"