Struggling with Upscaling & Image Sizes – Any Advice?

Hi everyone!

I’m currently creating my poster designs using ChatGPT, but I’m really struggling to understand the best process for upscaling and getting them ready for printing.

I’m planning to sell my designs in A4, A3 and A2 sizes.

A couple of questions:

When generating an image in ChatGPT, what size should I initially create it at?
Should I upscale every design to A2 at 300 DPI straight away, then use that file for the smaller sizes?
Or should I keep the original image and only upscale it when I receive an order?
What’s the best way to ensure the prints are high quality without losing detail?

I’m using Photoshop but finding the whole DPI, pixels and upscaling process quite confusing!

Would really appreciate hearing how everyone else handles this and what workflow you’d recommend

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Struggling with Upscaling & Image Sizes – Any Advice?