Best stable diffusion ultrasharp upscaler Apr 27, 2023 · Interesting review of upscalers for Stable Diffusion, especially about 4x-UltraSharp — sounds like a good balance of quality and speed. Upload an image to the img2img canvas. Step 2. I am grateful to the community for all the resources they have created and all the help they have provided which helped me get started with Stable Diffusion. Superscale is the other general upscaler I use a lot. Navigate to Img2img page. I think if the author of a stable diffusion model recommends a specific upscaler, it should give good results, since I expect the author has done many tests. Is it normal that so many Youtubers specialized in AI art recommend this ultrasharp upscaler while it is really bad actually? Or am I doing something wrong? So my Stable Diffusion x4 upscaler model card This model card focuses on the model associated with the Stable Diffusion Upscaler, available here. . Apr 29, 2023 · Consequently, an unscaled Stable Diffusion image would appear pixelated when enlarged. The model was trained on crops of size 512x512 and is a text-guided latent upscaling diffusion model. pt to: 4x-UltraSharp. Just be aware they need to be When developing my photorealism Lora app I did stupidly extensive testing on upscale models. All 3 are good for hiresfix and upscaling workflows, the best one will depend on your model and prompt since they handle certain textures and styles differently. Hello, I found many tutorial on Youtube claiming that 4x_UltraSharp is the best looking upscaler for SD, but after hours of testing, I came to the conclusion that the output is way too smoothed out and detail is lost (skin, hair). Apr 13, 2025 · The best upscaler depends on your specific use case (e. The data set for t I dont really know about hires fix upscaling though, mostly used models in chaiNNer straight. g. The paper that gave one of the bases for modern upscaling was Super Resolution which proposed the SRGAN, used these indices for calculations. Just wanted to share the comparison of about 100 min generation time. All made possible with Aiarty, a standalone AI upscaler. it preserves detail and left no patterns, and didn't damage camera blur by trying to sharpen it. Images were created with parameters: Cus of the initial 512x768 which doesn't always give Sep 13, 2024 · III. 25M steps on a 10M subset of LAION containing images >2048x2048. 160+ Upscalers for Stable Diffusion This collection includes some fresh models released just last month, as well as some older ones from 2-3 years ago that are still actively discussed by users. Oct 5, 2025 · Using an upscaler alone is not ideal. Read the description, pros, and cons of each image upscaler now. (Siax should do well on human skin, since that is what it was trained on) Feb 26, 2025 · Discover the step-by-step process for installing and using the Ultimate SD Upscaler Script to enhance your image quality through Stable Diffusion. pth inside the folder: "\ YOUR~STABLE~DIFFUSION~FOLDER\models\ESRGAN\") Restart you Stable Diffusion Now in " Extra Tab " you got the new upscaler The three general models I like to use are 4xUltaSharp, NMKD-Superscale, and Foolhardy Remacri. How does AI upscaler work? AI upscalers, in contrast, are models that have been trained using vast amounts of data. Sep 28, 2025 · Simplest Way to Upscale Stable Diffusion Pics with Details Achieve 8X/16X upscaling with details easily, no altering of the image, fast speed. Moreover, Stable Diffusion's generated complex scenes usually lack sharpness and fine details, posing further challenges. The right upscaler will always depend on the model and style of image you are generating; Ultrasharp works well for a lot of things, but sometimes has artifacts for me with very photographic or very stylized anime models. This model is trained for 1. If you have stable diffusion in hand, why not adding it to your upscaler workflow? SD Upscale is a script that comes with AUTOMATIC1111 that performs upscaling with an upscaler followed by an image-to-image to enhance details. , AI-generated images, real-world photos, videos, etc. fix, Ultimate SD Upscale script, Tiled Diffusion, Extras upscaler and a standalone upscaler from AIarty. I switched from ultrasharp to Nickelback and finally to Siax. Jul 29, 2024 · This article shows you 3 best Stable Diffusion Upscalers for enhancing image details. Step 1. May 26, 2023 · About the testing A humble non-scientific test of comparing 4 popular upscalers in upscaling images to 2x via SD Upscale script. But according to them, the absolute best measure was still a PI : Perception Index which was a human supervised blind grading measure. Jun 20, 2023 · Up to now the upscalers i used most were: UltraSharp, R-ESGGAN, LDSR, Remacri and SwinIR. ), the desired quality, and the computational resources available. Reply reply More repliesMore replies altoiddealer • Reply reply aikitoria • Jun 7, 2025 · Key Takeaway: Stable Diffusion is ideal for creating stunning visuals, whether for quick drafts or professional work. SUPIR: Best Stable Diffusion Super Resolution Upscaler + full workflow. Start with tools like NanoGPT for simple, pay-as-you-go access. Hello, for past week I've been exploring stable diffusion and I saw many recommendations for upscaler 4x-UltraSharp, which game me nice results, but later I found out about 4x_NMKD-Siax_200k, which gave me much better and more details. Oct 30, 2025 · Stable Diffusion upscalers covered here are: highres. pth Copy the file 4x-UltraSharp. You can use these upscalers not only with Stable Diffusion but also with local programs like chaiNNer, Python scripts, and even some convenient online demo sites. Here are some of the top upscalers used in AI workflows, including those compatible with ComfyUI and Stable Diffusion: Jul 25, 2023 · This upscaler is not mine, all the credit go to: Kim2091 Official WiKi Upscaler page: Here License of use it: Here HOW TO INSTALL: Rename the file from: 4x-UltraSharp. hpywknj yon gfhdt yjmfks ihapj vfbyc htzaphg yakvopzr xgvrikz usb islzl kaylqvd nehff iuiul lnenmv