Upscaling, max sizes and quality · Poster Print on Demand

Upscaling, max sizes and quality

I've been doing some test for image quality and getting a little worried. I'm Mac based, photoshop, Topaz Gigapixel for upscaler - although I've tried other options also. Using AI to make the art, currently ChatGPT is giving me the closest design I want, although I manipulate further in photoshop. Then I take to Topaz gigapixel and upscale.

But when I zoom in to 100% size, I'm seeing fuzzy image quality, not the sharp lines I would want. I feel like I'm doing something wrong - but I've never gone to this size before. I had been selling things like frame TV art and desktop wallpapers, or doing graphic flyer designs, etc.

I don't want to overthink things, but I don't want terrible quality either. When I get an image from say CGPT - what's my next step? I've been going all the way to A0 size - too much??

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Upscaling, max sizes and quality