Upscaling · Poster Print on Demand

Upscaling

Hello everyone, I'm very new to this so bare with me and excuse what is probably a simple question. I'm using Chatgpt to make some simple vector style artwork to upscale into posters and I'm concerned about the quality when upscaling in to sizes above A4, especially A1. Now I understand that any size at 300dpi is good enough for printing I'm just a bit of novice with how this works. So, I'm taking an image chatgpt generates at 1024 x 1536 px. I then open a file on Krita (poor mans photoshop) at the dimension I want, so lets say A1, I then paste in the image created by chatgpt and its obviously tiny on the A1 canvas so I use the scale option on Krita to scale it to what every I need to fill the space. Then I export this file as my A1 version of the design. I'm just concerned that although it doesn't look distorted on my screen that when its printed it will be blurry and lose its quality as I'm not confident that the scaling is adding the relevant pixels density needed. I would love a way of knowing the my product image is at the correct quality or the larger size so I can confidently sell my art on Etsy. I'm pretty much flat broke at the moment as I would order a print in the largest size I want to offer to see the quality myself but sadly that's not quite an option at the moment. Any help would be greatly appreciated and I'm looking forward to getting started and using Printshrimps services and being part this community :D

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