add suggested parameters for supported diffusion models

docs/tutorials/using-image-generation-models.md

@@ -47,6 +47,288 @@ The generated image will be displayed in the UI. Your image may look different g
 
 ![Generated](../assets/tutorials/using-image-generation-models/image-playground.png)
 
+## Extensions
+
+GPUStack currently does not support GGUF image models that are not all-in-one (base model, text encoder, and VAE combined). Please refer to the supported model list for details:
+
+● [Hugging Face](https://huggingface.co/collections/gpustack/image-672dafeb2fa0d02dbe2539a9)
+
+● [Model Scope](https://modelscope.cn/collections/Image-fab3d241f8a641)
+
+### Basic Configuration Guide
+
+The core parameters of image generation models are key to achieving desired outputs. These include `Prompt`, `Seed`, `Resolution`, `Sampler`, `Scheduler`, `Sampling Steps` and `CFG scale`.
+Different models may have variations in parameter settings. In order to quickly get started and generate satisfying images, the following section is going to provide some reference values for parameter configurations.
+
+#### FLUX.1-dev
+
+For FLUX models, it is recommended to disable CFG (CFG=1) for better results.
+
+Reference settings:
+
+| Parameter | Value     |
+|-----------|-----------|
+| Size      | 1024x1024 |
+| Sampler   | euler     |
+| Scheduler | discrete  |
+| Steps     | 20        |
+| CFG       | 1.0       |
+
+Recommended samplers: euler, heun, ipndm, ipndm_v
+
+Recommended scheduler: discrete
+
+✏️**Try it out!**
+```text
+Prompt: A kangaroo holding a beer,wearing ski goggles and passionately singing silly songs.
+Size: 1024x1024
+Sampler: euler
+Scheduler: discrete
+Steps: 20
+CFG: 1.0
+Seed: 838887451
+```
+
+![flux.1-dev](../assets/tutorials/using-image-generation-models/flux.1-dev.png)
+
+##### Using LoRA
+
+**Configuration**: Edit model -> Advanced -> Backend Parameters -> Add `--lora=<path/to/your/lora_file>`
+
+![add-lora-file](../assets/tutorials/using-image-generation-models/add-lora-file.png)
+
+The top row shows the original images, while the bottom row displays the corresponding images generated using LoRA.
+
+![flux.1-dev-lora](../assets/tutorials/using-image-generation-models/flux.1-dev_lora.png)
+
+!!! note
+
+    LoRA is currently an experimental feature. Not all models or LoRA files are compatible.
+
+
+#### FLUX.1-schnell
+
+For FLUX models, it is recommended to disable CFG (CFG=1) for better results.
+
+Reference settings:
+
+| Parameter | Value     |
+|-----------|-----------|
+| Size      | 1024x1024 |
+| Sampler   | euler     |
+| Scheduler | discrete  |
+| Steps     | 2-4       |
+| CFG       | 1.0       |
+
+Recommended samplers: euler, dpm++2mv2, ipndm_v
+
+Recommended scheduler: discrete
+
+✏️**Try it out!**
+```text
+Prompt: A mischievous ferret with a playful grin squeezes itself into a large glass jar, surrounded by colorful candy. The jar sits on a wooden table in a cozy kitchen, and warm sunlight filters through a nearby window
+Size: 1024x1024
+Sampler: euler
+Scheduler: discrete
+Steps: 3
+CFG: 1.0
+Seed: 1565801500
+```
+
+![flux.1-schnell](../assets/tutorials/using-image-generation-models/flux.1-schnell.png)
+
+#### Stable-Diffusion-v3-5-Large
+
+Reference settings:
+
+| Parameter | Value     |
+|-----------|-----------|
+| Size      | 1024x1024 |
+| Sampler   | euler     |
+| Scheduler | discrete  |
+| Steps     | 25        |
+| CFG       | 4.5       |
+
+Recommended samplers: dpm++2m, ipndm, ipndm_v, dpm++2mv2, eluer, heun, dpm2
+
+Recommended scheduler: discrete
+
+✏️**Try it out!**
+```text
+Prompt: Lucky flower pop art style with pink color scheme,happy cute girl character wearing oversized headphones and smiling while listening to music in the air with her eyes closed,vibrant colorful Japanese anime cartoon illustration with bold outlines and bright colors,colorful text "GPUStack" on top of background,high resolution,detailed,
+Size: 1024x1024
+Sampler: dpm++2m
+Scheduler: discrete
+Steps: 25
+CFG: 5
+Seed: 3520225659
+```
+
+![sd-v3_5-large](../assets/tutorials/using-image-generation-models/sd-v3_5-large.png)
+
+#### Stable-Diffusion-v3-5-Large-Turbo
+
+For turbo models, it is recommended to disable CFG (CFG=1) for better results.
+
+Reference settings:
+
+| Parameter | Value                |
+|-----------|----------------------|
+| Size      | 1024x1024            |
+| Sampler   | euler/dpm++2m        |
+| Scheduler | discrete/exponential |
+| Steps     | 5/15-20              |
+| CFG       | 1.0                  |
+
+Recommended samplers: euler, ipndm, ipndm_v, dpm++2mv2, heun, dpm2, dpm++2m
+
+Recommended scheduler: discrete, karras, exponential
+
+✏️**Try it out!**
+```text
+Prompt: This dreamlike digital art captures a vibrant, kaleidoscopic bird in a lush rainforest
+Size: 768x1024
+Sampler: heun
+Scheduler: karras
+Steps: 15
+CFG: 1.0
+Seed: 2536656539
+```
+
+![sd-v3_5-large-turbo](../assets/tutorials/using-image-generation-models/sd-v3_5-large-turbo.png)
+
+#### Stable-Diffusion-v3-5-Medium
+
+Reference settings:
+
+| Parameter | Value    |
+|-----------|----------|
+| Size      | 768x1024 |
+| Sampler   | euler    |
+| Scheduler | discrete |
+| Steps     | 28       |
+| CFG       | 4.5      |
+
+Recommended samplers: euler, ipndm, ipndm_v, dpm++2mv2, heun, dpm2, dpm++2m
+
+Recommended scheduler: discrete
+
+✏️**Try it out!**
+```text
+Prompt: Plush toy, a box of French fries, pink bag, long French fries, smiling expression, round eyes, smiling mouth, bright colors, simple composition, clean background, jellycat style,
+Negative Prompt: ng_deepnegative_v1_75t,(badhandv4:1.2),EasyNegative,(worst quality:2)
+Size: 768x1024
+Sampler: euler
+Scheduler: discrete
+Steps: 28
+CFG: 4.5
+Seed: 3353126565
+```
+
+![sd-v3_5-medium](../assets/tutorials/using-image-generation-models/sd-v3_5-medium.png)
+
+#### Stable-Diffusion-v3-Medium
+
+Reference settings:
+
+| Parameter | Value     |
+|-----------|-----------|
+| Size      | 1024x1024 |
+| Sampler   | euler     |
+| Scheduler | discrete  |
+| Steps     | 25        |
+| CFG       | 4.0       |
+
+Recommended samplers: euler, ipndm, ipndm_v, dpm++2mv2, heun, dpm2, dpm++2m
+
+Recommended scheduler: discrete
+
+✏️**Try it out!**
+```text
+Prompt: A guitar crafted from a watermelon, realistic, close-up, ultra-HD, digital art, with smoke and ice cubes, soft lighting, dramatic stage effects of light and shadow, pastel aesthetic filter, time-lapse photography, macro photography, ultra-high resolution, perfect design composition, surrealism, hyper-imaginative, ultra-realistic, ultra-HD quality
+Size: 768x1280
+Sampler: euler
+Scheduler: discrete
+Steps: 30
+CFG: 5.0
+Seed: 1937760054
+```
+
+!!! tip
+
+    The default maximum image height is 1024. To increase it, edit the model and add the backend parameter --image-max-height=1280 in the advanced settings.
+
+
+![sd-v3-medium](../assets/tutorials/using-image-generation-models/sd-v3-medium.png)
+
+#### SDXL-base-v1.0
+
+Reference settings:
+
+| Parameter | Value     |
+|-----------|-----------|
+| Size      | 1024x1024 |
+| Sampler   | dpm++2m   |
+| Scheduler | karras    |
+| Steps     | 25        |
+| CFG       | 5.0       |
+
+Recommended samplers: euler, ipndm, ipndm_v, dpm++2mv2, heun, dpm2, dpm++2m
+
+Recommended scheduler: discrete, karras, exponential
+
+✏️**Try it out!**
+```text
+Prompt: Weeds blowing in the wind,By the seaside,Ultra-realistic,Majestic epic scenery,excessively splendid ancient rituals,vibrant,beautiful Eastern fantasy,bright sunshine,pink peach blossoms,daytime perspective.
+Negative Prompt: ng_deepnegative_v1_75t,(badhandv4:1.2),EasyNegative,(worst quality:2),
+Size: 768x1280
+Sampler: dpm++2m
+Scheduler: exponential
+Steps: 30
+CFG: 5.0
+Seed: 3754742591
+```
+
+![sdxl-base-v1.0](../assets/tutorials/using-image-generation-models/sdxl-base-v1.0.png)
+
+#### Stable-Diffusion-v2-1-Turbo
+
+For turbo models, it is recommended to disable CFG (CFG=1) for better results.
+
+Reference settings:
+
+| Parameter | Value  |
+|-----------|--------|
+| Size      | 512x512 |
+| Sampler   | euler_a |
+| Scheduler | discrete |
+| Steps     | 6      |
+| CFG       | 1.0    |
+
+Recommended samplers: eluer_a, dmp++2s, lcm
+
+Recommended scheduler: discrete, karras, exponential, ays, gits
+
+✏️**Try it out!**
+```text
+Prompt: A burger patty, with the bottom bun and lettuce and tomatoes.
+Size: 512x512
+Sampler: euler_a
+Scheduler: discrete
+Steps: 6
+CFG: 1.0
+Seed: 1375548153
+```
+
+![sd-v2_1-turbo](../assets/tutorials/using-image-generation-models/sd-v2_1-turbo.png)
+
+
+!!! note
+
+    The parameters above are for reference only. The ideal settings may vary depending on the specific situation and should be adjusted accordingly.
+
+
+
 ## Conclusion
 
 Congratulations! You’ve successfully deployed and used an image generation model in GPUStack. With this setup, you can generate unique and visually compelling images from textual prompts. Experiment with different prompts and settings to push the boundaries of what’s possible.