Neat Image does a good job with this image. You create a noise profile by manually sampling areas of the image with uniform noise and use that to build a noise profile. Here's the image with noise reduction applied: Google drive. Source: almost 2 years ago

I don't know if this will work, and I'm sure someone will correct me if I'm wrong... BUT! What if you upscale it on something like "upscale.media" (that is a url), then print it at 300 dpi, however big you can get it to be. Then scan that print to be as big as you need it. And then put it on the blanket. It just might work! And it's not like a blanket will require super high resolution anyway. Source: 6 months ago

You can use upscale.media to get ai upscaling. Works really well when finding lower res covers. Source: 6 months ago

The one I'm using now, and its free is upscale.media and the other recommended was Topaz AI. Source: 11 months ago

I recommend to drop the photo on upscale.media or any other image upscaler and put the enhance quality on it should help. Source: 11 months ago

The process for this one was fun. I started with no prompt and ran 9 images. I considered my favorite of the batch and distilled it down to a word. I tried to avoid nouns as to not give too much direction too early. Once I started getting a bunch of boring similar images I backed up a few words to where it was really dynamic and interesting. Then I found one and hires fixed it, then img2img scaled up by 2 to add a... Source: about 1 year ago