Image Generation Log — CobhamTech.com

Date: 2026-05-10 Model: imagen-4.0-generate-001 (Gemini Imagen 4) SDK: google-genai (Python) API Key: AIzaSyD-njx1-hyqnazckGTJ6SnMJ8o_B2C0UsI Script: generate_images.py (deleted after run)

Images Generated

hero-bg.jpg

Prompt: Professional enterprise server room, long corridor of dark rack servers with blue LED ambient lighting, deep perspective, dark navy background, cinematic shallow depth of field, no people, photorealistic, ultra detailed
Aspect ratio: 16:9
File size: 395,927 bytes
Placement: .ct-hero background-image in assets/css/page-home.css — overlay gradient rgba(12,15,24,0.82) to rgba(12,15,24,0.92), background-size cover
Status: OK

about-visual.jpg

Prompt: Professional IT consultant at a clean modern workstation, dual monitors displaying network diagrams and dashboards, dark office with subtle blue ambient lighting, business attire, confident expression, photorealistic
Aspect ratio: 4:3
File size: 426,565 bytes
Placement: about.html ct-about-story section — third column, grid-template-columns updated to 1fr 1fr 420px, img tag with border-radius 4px
Status: OK

services-bg.jpg

Prompt: Abstract enterprise technology network, dark background, glowing blue interconnected nodes and data pathways, minimal high-tech aesthetic, no text, no people, cinematic, photorealistic render
Aspect ratio: 16:9
File size: 403,142 bytes
Placement: .ct-svc-idx-hero background-image in assets/css/page-services-index.css — same overlay pattern as hero-bg
Status: OK

intro-visual.jpg

Prompt: Business professional and IT consultant collaborating at a modern conference table with laptops and tablets, professional corporate office, clean neutral dark background, photorealistic, teamwork and trust
Aspect ratio: 4:3 (retried — original 3:2 not supported)
File size: 373,852 bytes
Placement: index.html — div.container block between ct-intro section and ct-home-sec-services, max-height 400px object-fit cover
Status: OK

API Errors / Retries

intro-visual.jpg failed on first attempt with aspect ratio 3:2: aspectRatio 3:2 is not supported. Supported values are 1:1, 9:16, 16:9, 4:3, 3:4.
Retried with 4:3. Succeeded.

Supported Aspect Ratios (Imagen 4)

1:1, 9:16, 16:9, 4:3, 3:4

3:2 is NOT supported. Use 4:3 as the closest substitute for landscape-medium compositions.

Docker

Rebuilt cobhamtech-static image from scratch after HTML/CSS changes
Container running on port 8010
All 4 images confirmed HTTP 200 at runtime
Homepage HTTP 200

Lessons Learned

Imagen 4 does not support 3:2 aspect ratio. The supported set is: 1:1, 9:16, 16:9, 4:3, 3:4. Always validate aspect ratios before scripting a batch.
Generation of 4 images (3 x 16:9, 1 x 4:3) completed in under 90 seconds total.
Dark overlay gradients (rgba at 0.82-0.92 opacity) are necessary on these photorealistic images to maintain text legibility against white hero text.
File sizes ranged 374KB-427KB for JPEG output at these aspect ratios — appropriate for web use without additional compression.
The google-genai SDK uses client.models.generate_images() with a GenerateImagesConfig object — not the generate_content() path.

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