Ideogram color_palette parameter: brand colours in Sume prompts

Ideogram's Generate 3.0 reference lists an optional color_palette parameter. The Sume image API has no such field: its request schema (see the Image API docs) carries model, prompt, n, resolution, aspect_ratio, quality, output_format, mask_url, background, input_references and a few routing and job fields. A request that sets a parameter the model does not list is rejected with 400 unsupported_parameter. Brand colours therefore travel in the prompt, backed by a swatch reference image.

What the vendor page says

From the Ideogram API reference, read on the date below.

Do not send it

Copying an Ideogram body that includes color_palette into a Sume request will fail by design. Catalog descriptors are the definitive list, and allowed_passthrough_parameters is empty for every endpoint in v1, so provider.options cannot smuggle it through either.

Two substitutes that work

Combine both for the strongest pull:

• Name the colours in the prompt with hex codes and roles, for example "background #F4EDE4, accent #1F6F5C, text near-black".
• Send a plain swatch image as an input_references entry and say "use only the colours in image 1". Models that list input_references with a max above 0 accept it.

Make the swatch from the brand file

A swatch needs no design tool. This script writes a PNG of equal colour bands; upload it anywhere public over HTTPS, then reference it.

from PIL import Image, ImageDraw

colors = ["#F4EDE4", "#1F6F5C", "#E2A33B", "#222222"]
w, h = 256, 256
img = Image.new("RGB", (w * len(colors), h))
d = ImageDraw.Draw(img)
for i, c in enumerate(colors):
    d.rectangle([i * w, 0, (i + 1) * w, h], fill=c)
img.save("swatch.png")
print("saved swatch.png")

Check the result

Colour adherence is a soft control. Sample the output with an eyedropper or a script, and if a colour drifts, shorten the palette to three. Because there is no seed, repeat the prompt once before blaming the wording.