Which palette and exact-colour controls do FLUX, Recraft and Ideogram document, and how should I verify that a generated image kept the brand colours?

Problem. Brand work needs specific colours; prompts alone drift. Conditions. FLUX.2 / FLUX 3 (BFL), Recraft API, Ideogram 3.0 API, docs of 23 Oct 2026. Method (documented). BFL: hex codes name exact colours in FLUX.2 prompts (docs claim brand-guideline matching 'with precision'); the FLUX 3 edit docs say to tie each hex code to one named object (for example only one bird in the middle) so the model knows where the colour goes. Recraft: controls.colors is an array of up to 10 {rgb:[r,g,b]} objects with an optional weight 0 to 1 (set for all or none, sum at most 1) and controls.background_color; the docs call them 'preferable colors'. A palette can also be stored with a style (Create style). Ideogram 3.0: a color_palette parameter exists (schema not expanded in the page read), plus style_codes (8-character hex codes) and style_preset; the preset cannot be combined with codes or references. Verify [inference]. Sample the output in sRGB, cluster to the dominant five to eight colours, and measure each brand colour's nearest cluster by a colour difference (such as CIEDE2000; not in these docs); flag drift beyond the tolerance your brand guide sets; check tagging first (C3-B586-03 and C3-B232-G71-04 apply to stills too). Treat 'preferable' as a bias not a guarantee; when exact colour matters, recolour the final in an editor with the true hex values or composite flat brand-colour shapes (C3-B593-03). Failure modes. Lighting and shadow shift perceived colour; gradients and photos have no single hex. Limitations. I did not call any API; the claim of precision for hex steering is the vendor's. Design-theory harmony sources are in C3-B027-G8-04/05 and C2-B22-E3-13/14. Version/date. 2026-10-23. Cross-reference correction 2026-10-23 (discovery C3-B697-01): worker provisional ids replaced by published C3 ids: P-L1-5-03 -> C3-B593-03 (same_batch; at link verification 2026-10-23T23:35:19Z this producer identifier had no verified public Hub record; no public link is asserted here). Curator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources. Limitations: Vendors describe colour control qualitatively; no adherence statistics are given. Ideogram's palette schema was not visible in the page. Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

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      "url": "https://docs.bfl.ml/flux_2/flux2_text_to_image.md",
      "note": "FLUX.2 intro; Exact colors with hex codes; Controls; Colors; Colors; Body parameters; Body parameters; Colors"
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      "url": "https://docs.bfl.ml/guides/prompting_unified_style.md",
      "note": "FLUX.2 intro; Exact colors with hex codes; Controls; Colors; Colors; Body parameters; Body parameters; Colors"
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      "url": "https://www.recraft.ai/docs/api-reference/endpoints.md",
      "note": "FLUX.2 intro; Exact colors with hex codes; Controls; Colors; Colors; Body parameters; Body parameters; Colors"
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      "url": "https://developer.ideogram.ai/v2/api-reference/images/generate/ideogram-3.md",
      "note": "FLUX.2 intro; Exact colors with hex codes; Controls; Colors; Colors; Body parameters; Body parameters; Colors"
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