Info

import torch
from diffusers import ChromaPipeline

pipe = ChromaPipeline.from_pretrained("lodestones/Chroma1-HD", torch_dtype=torch.bfloat16)
pipe.enable_model_cpu_offload()

prompt = [
    "A high-fashion close-up portrait of a blonde woman in clear sunglasses. The image uses a bold teal and red color split for dramatic lighting. The background is a simple teal-green. The photo is sharp and well-composed, and is designed for viewing with anaglyph 3D glasses for optimal effect. It looks professionally done."
]
negative_prompt =  ["low quality, ugly, unfinished, out of focus, deformed, disfigure, blurry, smudged, restricted palette, flat colors"]

image = pipe(
    prompt=prompt,
    negative_prompt=negative_prompt,
    generator=torch.Generator("cpu").manual_seed(433),
    num_inference_steps=40,
    guidance_scale=3.0,
    num_images_per_prompt=1,
).images[0]
image.save("chroma.png")

Covers

Prompt: Bright colors, close-up photograph of a single tiger eye, direct frontal view. The iris is very detailed, and the pupil resembles a dark void. The word "Chroma" is across the upper portion of the image in large white stylized letters, with brush strokes. Each strand of the thick fur is highly detailed and distinguishable. Natural lighting to capture authentic eye shine and depth. "9B" is handwritten over the image in the top left corner.

Time: 3m 37.21s | total 271.95 pipeline 216.24 callback 39.56 preview 11.97 prompt 1.46 te 1.46 decode 0.95 gc 0.29 | GPU 27202 MB 22% | RAM 60.6 GB 49%

Prompt: Bright colors, close-up photograph of a single tiger eye, direct frontal view. The iris is very detailed, and the pupil resembles a dark void. The word "Chroma" is across the upper portion of the image in large white stylized letters, with brush strokes. Each strand of the thick fur is highly detailed and distinguishable. Natural lighting to capture authentic eye shine and depth. "9B" is handwritten over the image in the top left corner.

Time: 3m 51.63s | total 306.36 pipeline 230.87 callback 45.67 preview 25.74 prompt 1.51 te 1.51 decode 0.75 gc 0.30 | GPU 27140 MB 22% | RAM 38.09 GB 31%

Prompt: Bright colors, close-up photograph of a single tiger eye, direct frontal view. The iris is very detailed, and the pupil resembles a dark void. The word "Chroma" is across the upper portion of the image in large white stylized letters, with brush strokes. Each strand of the thick fur is highly detailed and distinguishable. Natural lighting to capture authentic eye shine and depth. "9B" is handwritten over the image in the top left corner.

Negative: low quality, ugly, unfinished, out of focus, deformed, disfigure, blurry, smudged, restricted palette, flat colors

Time: 1m 18.75s | total 100.56 pipeline 78.05 callback 13.95 preview 4.56 prompt 1.50 te 1.50 decode 0.69 gc 0.29 | GPU 27176 MB 22% | RAM 43.73 GB 36%

seed	chroma-unlocked-v48	chroma-unlocked-v48-detail-calibrated	Chroma.1 base	chroma-unlocked-v50-annealed	Chroma1-HD	Chroma1-Flash
433
21
21* (Neg prompt)
38
42
2025
20251225
2925654389

Chroma1-Flash and CFG

Prompt: Bright colors, close-up photograph of a single tiger eye, direct frontal view. The iris is very detailed, and the pupil resembles a dark void. The word "Chroma" is across the upper portion of the image in large white stylized letters, with brush strokes. Each strand of the thick fur is highly detailed and distinguishable. Natural lighting to capture authentic eye shine and depth. "9B" is handwritten over the image in the top left corner.

Negative: low quality, ugly, unfinished, out of focus, deformed, disfigure, blurry, smudged, restricted palette, flat colors

Time: 41.07s | total 65.53 pipeline 40.36 callback 13.40 preview 7.79 prompt 1.49 te 1.49 decode 0.70 gc 0.29 | GPU 27176 MB 22% | RAM 42.89 GB 35%