- 1024x1024: A square format suitable for balanced compositions or social media.
- 1792x1024: A wide (landscape) format ideal for panoramic or scenic images.
- 1024x1792: A tall (portrait) format, great for showcasing vertical subjects or details.
1024x1024
1400x1400
Start with the same dimensions as you intend to use. Always better to resize images by a non decimal multiple ie 2:1 not 2.35:1 if possible for best results (but I understand not possible in this case)
Works in this GPT but may need some modifications to prompt in base Chat GPT
If you want a ‘weird’ ratio, first ask it to add a white space border to make the image the right proportions, then resize.
For OP, the 1:4 but with whitespace added to not stretch. unfortunately there are only 3 starting sizes above so the best result I think without any stretching