Rebuilding My Wallpaper App's Color Variations on Nano Banana 2 — Life After the Imagen 4 Shutdown, and Why Resolution Decides the Margin
How I moved my wallpaper app's color-variation pipeline onto gemini-3.1-flash-image (Nano Banana 2): where Imagen 4 users have to go now, the current Interactions API call shape, a two-stage design derived from published per-resolution pricing, and a script that finds retired model IDs still sitting in your code.
Reliable Text-in-Image with Gemini 3.1 Flash Image — an OCR-Verified Pipeline
After the preview shutdown, the GA gemini-3.1-flash-image still occasionally garbles text baked into images. Here is a generate -> read-back-verify -> regenerate/composite pipeline, with working code and an unattended retry budget.
The Morning a Preview Image Model Went Dark — Migrating to GA Gemini Image Models and Building a Deprecation-Resilient Pipeline
With gemini-3.1-flash-image-preview and gemini-3-pro-image-preview retired, here is how to migrate to the GA models and design an image pipeline that no longer gets caught off guard by deprecation dates — with code and cost math, plus video-to-image thumbnail automation.
Generating a Thumbnail From a Video With Nano Banana 2 (gemini-3.1-flash-image)
A hands-on guide to passing a whole video as context to the GA model gemini-3.1-flash-image (Nano Banana 2) and generating a single thumbnail. Covers how it differs from frame extraction, the preview-to-GA migration, and measured cost and time per image.
Switching Image Models Quietly Degrades Quality — A Gate That Catches It Without Manual Review
When you move image generation from preview to GA models, the API keeps returning 200 and quality slips silently. This is the three-layer gate I built to detect that drift without staring at every image: deterministic property checks, multimodal embedding similarity, and a Gemini judge, wired together in Python with thresholds and a cutover procedure.
Gemini's GA Image Models Won't Output Exact Device Resolutions — A Wallpaper Pipeline That Fixes Aspect Ratio and Safe Areas
After switching to the GA image models, your wallpapers no longer fit the screen. Here's how to crop one master image into every device resolution and cut your generation count to a fraction, with full Pillow code.
Gemini's Preview Image Models Shut Down on June 25 — Code Diffs and Checks From an Actual GA Migration
How I moved my image pipeline off Gemini's preview image models before the June 25 shutdown — confirming GA model IDs, Python code diffs, regression checks, and a safe cutover order.
When gemini-2.5-flash-image Ignores Your Reference Image — Diagnosing Why Nano Banana Returns a Totally Different Picture
A field-tested triage order for the situations where gemini-2.5-flash-image (Nano Banana) silently ignores your reference image, swaps the subject, or refuses to honor your edit instructions. Covers parts ordering, response_modalities, image size, and chat-session pitfalls with runnable code.
Five Errors That Break Gemini Image Generation — From 429s to Safety Filters
Causes and implementation-level fixes for the Gemini API image generation errors you are most likely to hit: 429 quota exhaustion, safety filter blocks, and corrupted output.