ComfyUI : Ultimate Upscaler - Upscale any image from Stable Diffusion, MidJourney, or photo!

In this ComfyUI tutorial we look at my favorite upscaler, the Ultimate SD Upscaler and it doesn't seem to get as much attention as it deserves. It is a node is easy to add to any graph, but I also explore how to make it so we can choose whatever scale factor we desire without needing to calculate the optimal resolutions required for the best results from SDXL. The resulting graph from today will also be posted on YouTube in the member area for sponsor level and higher, and a huge thank you to everyone supporting the channel! #comfyui #stablediffusion #sdxl #aiart

SDXL model from here (OFFICIAL): (bonus LoRA also here)

[RufusTheRuse]

Two things that were really important to me in this video to use the Ultimate SD Upscaler correctly in my workflow:
(1) Use a tile size of 1024 for SDXL. Duh, in retrospect, but I hadn't thought of that.
(2) Use the empty positive & negative prompts.
The first time I used the upscaler, I ended up with horrific 512 tiling results (seams, non-flowing contents per tile, even w/ low denoise) along with extra stuff (little people) showing up. Both (1) and (2) fixed that for me. When I ran into the problem, this was the first place I turned to. Thank you, Scott. 🙌

[marhensa]

wooow.. can't believe my custom node 1:05 (Recommended Resolution Calculator) is shown in my favorite tutorial channel, did not expect that!

[amaremail]

Scott, THANK. YOU. None of the other tutorials I watched for upscaling explains how things actually work in such detail. I really appreciate it. I aim to learn as I go along, and your videos are always super helpful.

[KevinFlynn]

Hi Scott, Thanks for putting this video out. I just started using ComfyUI form SD1111 and video's like this have helped out tremendously. I will be checking out more of you vids. Thank you!

[aminbehravan]

I follow the steps, and I learn each video, but tomorrow when I open the comfy again I am blank, have to go through your videos to learn and really digest each steps

[Kevlord]

After using forge i gave it a shot, since i was kinda interested.. Its pretty neat. Using forge gave me the advantage to know what stuff means, but certainly an adjustment. Its was a great vid, easy to understand. Works great, thank you very much.

[timothybridge]

Thank you for these awesome videos- I now have a control net render set up for my smaller previews- followed by an amazing upscale setup.

[Aamir]

Thank you Scott, great video like always. For me Upscaling/Recreating an existing image with different denoising values, different tools and so on are more exciting than creating a new image.

[keystothebox]

best upscale tutorial i have ever seen for comfy ui. well done

[kenthouston]

Hmmm - I tried this ... but I'm still seeing a lot of tiling artifacts - no matter which tile elimination scheme I pick. Is there a way to hook this up so that it is used in the initial creation of an image? Some way of using it so that if you generate a smaller image you like, you can reload that generation data and regenerate from scratch at the much higher resolution - to avoid the tiling issues? Or is the generation process just inherently "dirty"?

I appreciate your putting these videos up :) - Thank You :)

[ANTONIORODRIGUEZ-if]

Thank you, detailed and explained but concise, FANTASTIC tutorial, you have a new subscriber.
THANK YOU 👏👏👏👏👏👏👏👏👏👏👌👌

[mchaney]

Beautifully laid out content. Thank you!

[marekpietrak]

Thank you very much for a clear and concise tutorial.

[Satscape]

Thank you, I got that node a few days ago and had no idea how to wire it up, now I do!
Also, 300 seconds is not a long time at all when you have a 4GB GPU...I have patience. 😁

[MoeAji]

Comparing SDXL upscaling to StableSR quickly here: StSR "appears" sharper, but SDXL is a but more "logical". It depends on the image really.
The cool thing about difussing upscaling is creation of details. SwinIR works great for very small images, and ESRGAN models have their strengths and weaknesses.
Too many options!! But I'm not complaining.
Looking forward to a StableSR using the SDXL model.

[philstephens]

thank you very much for this, much appreciated.

[orcsheep]

really high quality tutorial, logic and clear!

[krakenunbound]

I am going to have to watch this a few more times to get my head around it. I came here trying to figure out how to make high-res wall papers in 16:9 format.

[skudcode]

Hi scott, will you please make a video on Openpose being applied over a 2d-charecter (sketch), so that an animator could easily animate his own charecter accordingly. There are a huge number of people who are waiting for this video. Thank you 🙏

[cmputer]

Very interesting, never heard of ComfyUI, but have been looking for good upscaling apps. I've never used any app that use nodes, but I'm interested to learn.