ImageLaunch and hero visualsIntermediateGenerates an image

Email header banner image

A wide, lightweight email header that stays legible when images are scaled down or partially blocked, with space for live text beneath it.

For: Performance marketers, Creative strategists, E-commerce marketers · Works with: OpenAI GPT Image, Google Gemini image generation (Nano Banana), FLUX (Black Forest Labs), Any image generator

Your prompt

Create a wide 3:1 email header banner for a monthly product-update newsletter email from a project-management software company. Subject: a few simple 3D calendar and checkmark shapes, simple and bold, placed right so it is not cut off on narrow screens. Background: a smooth soft-blue gradient, low detail so the file compresses well and looks clean when scaled to 600 pixels wide. Colour: soft blue, white and a bright orange accent with strong contrast; the image must still communicate if shown at a small size. Leave the left side calm for a headline to be added as live HTML text, not as part of the image. Constraints: no text, no logos, no tiny detail, no busy patterns.

Customize

The fields start with example values so you can see how the prompt works. Everything stays in your browser.

Kind of email.

Brand context.

The central visual.

Where the subject sits.

Background.

Colours.

Where live text goes.

Example of what to expect

Illustrative only. It describes the kind of result this prompt aims for; real output varies by tool, model and run.

A 3:1 header with a soft-blue gradient, simple 3D calendar and checkmark shapes at the right, and a calm area at the left for live HTML text.

Expected format: One wide image; export as a compressed JPEG or PNG at about 1200px wide for retina.

How to use it

  1. Put the headline and CTA in live HTML text, not in the image.
  2. Add alt text for clients that block images.
  3. Compress aggressively; test in major email clients.

Limitations

  • Many email clients block or alter images; essential content must not live only in the image.
  • File size affects load time on mobile; compress.

Platform notes

OpenAI GPT Image

Official docs read · checked 2026-10-11

Aspect ratio is set with the size parameter, not in prose. Use medium or high quality for text and fine detail. 3:1 is the maximum ratio supported for gpt-image-2 sizes per OpenAI's guide; use a valid size.

General notes on OpenAI GPT Image
  • OpenAI's guide covers gpt-image-2 (recommended), gpt-image-1.5, gpt-image-1 and gpt-image-1-mini.
  • Aspect ratio is set through the size parameter, not in prose. Quality is low, medium or high; medium or high is advised for small or dense text.
  • Put literal text in quotation marks, and when editing say what must stay unchanged.

Google Gemini image generation (Nano Banana)

Official docs read · checked 2026-10-11
General notes on Google Gemini image generation (Nano Banana)
  • Google's docs list several Nano Banana models (2.1, 2 Lite, 2, Pro) and recommend 2.1 for new projects as of the verification date.
  • Supported aspect ratios include 1:1, 4:5, 9:16, 16:9 and 21:9; sizes 1K, 2K and 4K. Up to 14 reference images per request.
  • All generated images carry a SynthID watermark.

FLUX (Black Forest Labs)

Official docs read · checked 2026-10-11

FLUX.2 does not use negative prompts, so constraints are phrased as things to do.

General notes on FLUX (Black Forest Labs)
  • BFL's official guidance for FLUX.2: no negative prompts (describe what you want), write sentences rather than keyword lists, specify lighting, quote text to render, and pair colour names with hex codes.

Any image generator

Official docs read · checked 2026-10-11
General notes on Any image generator
  • Written as natural-language descriptions that the verified image models accept. Syntax for aspect ratio, quality and negative prompts differs by tool, so set those in your tool's own controls.

Source, license and attribution

Origin
Original by MarketerTools
Publisher
MarketerTools
License
Original work by MarketerTools, free to copy and use. Informed by the linked documentation; no third-party text is reproduced.
Platform assumptions checked
2026-10-11

Documentation and references behind this prompt

These informed the structure and the platform notes. A reference is not a license, and no third-party prompt text is copied here.

Spotted an attribution error, or are you a source owner with a request? Use the chat button at the bottom right and quote prompt ID img-040. We will correct or remove it.

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