descriptionPrompting patterns for Ideogram 4 text-to-image — best-in-class in-image text rendering and exact color/layout control via structured JSON captions. Use when generating images that need legible on-image text (title cards, thumbnails, logos, signage, CTAs), precise brand colors, or controlled spatial layout. Triggers include title slide image, thumbnail with text, on-image text, legible text in image, brand color palette image, bounding-box layout, Ideogram. Ideogram 4 Skill
Text-to-image generation with Ideogram 4 (9.3B, open-weight, released June 2026). Its
superpower is best-in-class in-image text rendering — it beats much larger models
(FLUX.2 dev 32B, Qwen-Image 20B, Hunyuan 80B) at rendering legible signage, logos, captions,
and multi-line text — plus exact color-palette and bounding-box control.
That advantage is locked behind a structured JSON caption format. A plain-text prompt gets
you FLUX-level results and misses the entire point of using this model. This skill teaches
Claude to act as the "magic prompt" expander — turning a user's casual request into the JSON
caption Ideogram 4 was trained on.
Backend: The toolkit uses Ideogram's hosted v4 API (not self-hosted weights). The API
accepts a structured json_prompt, so everything this skill teaches applies directly — Claude
builds the caption, the tool posts it as json_prompt. Paid API plans include a commercial
license, which the self-hostable weights (non-commercial) do not — that's why we use the API.
Cost is ~$0.03/image (turbo) to ~$0.10/image (quality).
When to Use This Skill
Reach for Ideogram 4 (over FLUX.2) when the image needs:
- Legible on-image text — title cards, thumbnails, lower-thirds backgrounds, signage, logos,
quote cards, CTAs with a headline baked in
- Exact brand colors — hex color-palette conditioning, per-element
- Controlled layout — bounding boxes place text/objects in specific regions
- Multilingual text in the image
Use FLUX.2 instead when: the image has no critical text, you need commercial-licensed output,
or you just want a fast atmospheric background. FLUX takes plain natural-language prompts; Ideogram
wants JSON. See tools/flux2.py.
The One Thing to Get Right
Always emit a structured JSON caption, not a plain sentence. The model is trained
exclusively on JSON captions that name every element explicitly. Claude is a better expander
than Ideogram's free hosted magic-prompt (their own docs note the shipped one "is not the same
used in production"), so build the caption yourself using this skill rather than passing raw text.
Minimal valid caption:
{"high_level_description":"A sailboat at sunset on calm water.","style_description":{"aesthetics":"serene, warm, golden hour","lighting":"golden hour backlighting","photo":"wide angle, f/8","medium":"photograph","color_palette":["#FF6B35","#F7C59F","#004E89"]},"compositional_deconstruction":{"background":"Calm ocean at low horizon with orange-pink sky.","elements":[{"type":"obj","desc":"White triangular sail silhouetted against the setting sun."}]}}
Full schema, strict key-ordering rules, and the bbox coordinate system are in prompting.md.
Worked title-card / thumbnail / quote-card examples are in examples.md.
Quick Reference — tools/ideogram4.py
Thin wrapper over Ideogram's hosted v4 API. Needs IDEOGRAM_API_KEY in .env
(key from developer.ideogram.ai). --json posts the caption as the API's json_prompt
field (no server-side magic prompt — Claude is the expander); --prompt posts text_prompt.
# Hand-authored JSON caption (the recommended path for text/layout) — Claude writes caption.json
uv run tools/ideogram4.py --json caption.json --output title.png
# Caption from stdin (Claude can pipe it directly)
cat caption.json | uv run tools/ideogram4.py --json - --output title.png
# Plain prompt — Ideogram's server-side magic prompt expands it (weaker; prefer --json)
uv run tools/ideogram4.py --prompt "Title card: 'AI ENGINEERING REVIEW' bold white on dark" --output title.png
# Inject brand hex colors into the caption's palette (JSON mode)
uv run tools/ideogram4.py --json caption.json --brand digital-samba --output cta.png
# Quality tier + resolution
uv run tools/ideogram4.py --json caption.json --speed QUALITY --resolution 2048x2048 --output slide.png
Ideogram 4.5 (opt-in)
--model 4.5 sends the same flags to Ideogram 4.5 on the v2 API
(POST /v2/image/generate/ideogram-4-5, multipart like the v1 call). It has been run live:
JSON captions render near-perfect text; plain prompts add garbled filler text, so always
send a JSON caption to 4.5. Ideogram 4 stays the default because 4.5 sizes must be multiples
of 32, which rules out exact YouTube 1280x720 (/thumbnail uses 4.0 for that).
uv run tools/ideogram4.py --model 4.5 --json caption.json --speed QUALITY --resolution 1440x2560 --output card.png
-
Prompt: both modes go in 4.5's single prompt field. --json sends the caption as
compact JSON. 4.5 reads the Ideogram 4 caption format, and a valid caption skips
server-side magic prompt. --prompt text is expanded by magic prompt, as on v1.
-
--speed maps to quality: TURBO, DEFAULT and QUALITY at the same price as on
Ideogram 4, and FLASH, which has no Ideogram 4 price, to low (Ideogram's list prices,
checked 2026-10-12; 1K and 2K sizes cost the same):
4.5's very_low tier needs source images, so the tool never sends it. On --model 4,
FLASH is still sent as is, but Ideogram's docs say it currently returns HTTP 400.
-
--resolution is sent as size: auto, or WIDTHxHEIGHT with both sides multiples of
32 and at least 256px, at most 2048x2048 pixels in total, and an aspect ratio of at most
6:1. Omit it and Ideogram picks a size from the prompt. The tool checks these rules before
calling the API and exits 2 when a size breaks them. 1440x2560 (the 9:16 card size) and
2048x2048 pass. Six Ideogram 4 presets don't, and the error suggests a replacement:
720x1280 (1440x2560), 1280x720 (2560x1440), 720x1440 (1440x2880), 1440x720 (2880x1440),
1296x3168 (1280x3072), 3168x1296 (3072x1280). Without source images Ideogram also needs
one of its supported 1K/2K presets, a list it doesn't publish, so a size that passes the
checks can still get an HTTP 400.
Key Files
prompting.md — full JSON schema, strict key ordering, bbox coordinate system, palette rulesexamples.md — worked captions for title cards, thumbnails, quote cards, brand CTAs
Video Production Fit
Ideogram 4's niche in the toolkit is slides and thumbnails with baked-in text, where FLUX and
LTX-2 fail (both render garbled text). Natural pairings:
Then feed the still into Remotion (<OffthreadVideo>/Img) or animate it with tools/ltx2.py --input.