[Image Generation AI] How Does Switching Samplers Change the Texture of an Image?
When working with image generation AI, have you ever felt, "I entered the same instructions, but for some reason, the lines in this image are thick," or "The texture of this image is soft"? In fact, one of the major factors behind that difference is a setting called the "sampler." This time, we experimented on how the atmosphere of the images drawn by the AI changes just by swapping out this sampler. From the results of this experiment, let's look for hints on how to find the sampler that best suits your preferences.
- A sampler is the "calculation procedure" the AI uses to assemble an image from noise.
- Even with the same model and same prompt, the texture and line atmosphere change depending on the sampler.
- In this experiment, we compared 4 types of major samplers.
- The generation speed for all of them was at a comfortable speed that finished in an instant.
![[Image Generation AI] How Does Switching Samplers Change the Texture of an Image?](/img/illust-sampler-20261008-224723.png)
Experimental Conditions
In this experiment, we generated images for the theme "A woman reading a book in an autumn library" under the following conditions. 【Tools and Models Used】 - Model: novaAnimeXL (An anime-style model in the SDXL family) - Tool: Stable Diffusion WebUI Forge 【Common Settings】 - Image Size: 1024×1024 - Steps: 25 - CFG Scale: 5 - Seed: 455206 【PC Specs Used】 - GPU: RTX 4080 (VRAM 16GB) By fixing all conditions except for the "sampler," we are able to compare the pure impact of differences in calculation procedures on the image.
4 Types of Samplers Compared and Generation Speeds
This time, we compared 4 samplers frequently used in image generation. The generation speeds for each are as follows. - Euler a: 5.6 seconds - DPM++ 2M: 5.6 seconds - DPM++ 2M SDE: 5.7 seconds - DDIM: 5.4 seconds While all values are in the 5-second range, this is a very comfortable speed that feels like it appears in an instant. Because we used a high-performance GPU like the RTX 4080, the wait time was hardly noticeable even when changing the sampler.
- Euler a: 5.6 seconds (appears in an instant)
- DPM++ 2M: 5.6 seconds (appears in an instant)
- DPM++ 2M SDE: 5.7 seconds (appears in an instant)
- DDIM: 5.4 seconds (appears in an instant)
Visual Differences by Sampler
Even with the same character and the same theme, choosing a sampler changes the texture and line atmosphere that the AI captures. Generally, the following trends of differences may appear depending on the sampler: - Some become smoother in texture - Some become more finely detailed Regarding the specific visual differences, it is obvious at a glance by checking the comparison images. Even in the same "autumn library" scenery, you can see that the strength of the lines, the density of the background, and the texture of the character's skin differ subtly. In this way, the sampler is an important parameter that determines not only the "completion level" of the image but also the "emotion" of the image.
Tips for Switching Samplers for Beginners
For those who "don't know which sampler to use," it is recommended to start by trying standard ones first. First, try generating with the stable "Euler a" or "DPM++ 2M." These are used by many users and tend to be easy to handle. After that, when you feel "I want the lines to be a bit finer" or "I want to change the texture a little," trying other samplers one by one is the shortcut to finding the image you like. Please try comparing multiple samplers to get closer to the texture you prefer.
- People who are lost in the detailed settings of image generation AI
- People who want to find their preferred image texture
- People who want to know the specific differences between samplers
- Sampler
- Refers to the "calculation procedure" used by the AI as it assembles an image from random noise according to instructions.
- Steps
- Refers to the number of calculation repetitions the AI performs until it completes the image.
- CFG Scale
- A numerical value that adjusts how strictly the AI follows the prompt (instructions).
- Seed Value
- A number that serves as the "seed" for the generated image. By using the same seed value, you can reproduce an image with the same composition.
FAQ
Does changing the sampler significantly change the generation time?
In this experiment, all four types finished in just over 5 seconds. Although the calculation procedures differ, there was no significant difference in this environment.
Which is the most recommended sampler?
There is no specific "correct answer" in official information. It is recommended to start by trying "Euler a" or "DPM++ 2M" and then change them according to your preferred texture.
By switching between samplers, you can generate images with different textures even from the same instructions. The key is to start with standard ones and adjust them to your preference.