Cost-effective Image Prompt Writing

While Stable Diffusion and Midjourney are popular image generation AIs, this lesson will focus on gpt-image (gpt-image-1), OpenAI's latest image generation model used by ChatGPT.

1. Square (1:1) : 1024 x 1024

2. Landscape (3:2) : 1536 x 1024

3. Portrait (2:3) : 1024 x 1536

The default aspect ratio for most image-generating AIs, including gpt-image, is 1:1 (Square).

For blog post cover images, which typically use a wider format, it is recommended to specify 3:2 aspect ratio or Landscape in your prompt.

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Blog post cover image depicting the concept of taming ChatGPT through prompt engineering

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Blog post cover image depicting the concept of taming ChatGPT through prompt engineering, with a 3:2 aspect ratio

Note that you can use a comma (,) when adding an aspect ratio to the prompt, or you can write it as a narrative sentence without a comma.

These separators, such as commas in a prompt, are commonly referred to as Delimiters.

Using delimiters like commas or periods to structure prompts clearly helps the AI better interpret and meet the requirements, reducing misunderstandings.