# Low image quality in Nano Banana Pro 2 on Vertex AI Studio **URL:** \ **Category:** Gemini API\ **Tags:** ai-studio, vertexai, image-generation, gemini\ **Created:** [May 10, 2026, 4:55pm UTC](https://discuss.ai.google.dev/t/low-image-quality-in-nano-banana-pro-2-on-vertex-ai-studio/144258 "2026-05-10T16:55:44Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![Nesjii](https://d1dlmcr85iqnpo.cloudfront.net/user_avatar/discuss.ai.google.dev/nesjii/32/95508_2.png) [@Nesjii](https://discuss.ai.google.dev/u/Nesjii)\ **Post date:** [May 10, 2026, 4:55pm UTC](https://discuss.ai.google.dev/t/low-image-quality-in-nano-banana-pro-2-on-vertex-ai-studio/144258/1 "2026-05-10T16:55:44Z")
Over the last few days I noticed a major drop in image quality specifically inside Vertex AI Studio / Gemini API. Previously, the same prompts produced sharp, realistic images with detailed skin texture and natural-looking faces. Now the outputs look blurry, over-smoothed, and plastic-like. The biggest issue is facial skin quality: - waxy/plastic skin - loss of texture and detail - missing pores and natural skin texture - very soft blurry rendering even in 4K Important: I tested Nano Banana / gemini-3.1-flash-image-preview on other platforms and the quality there is noticeably better. The issue seems specific to Vertex AI Studio / Google Cloud. Using: - the same prompts - the same settings - the same workflow But image quality suddenly became much worse over the last few days. Is anyone else experiencing this? Did something change in the backend pipeline, compression, routing, or inference infrastructure? ---
**Author:** ![unwnu](https://d1dlmcr85iqnpo.cloudfront.net/user_avatar/discuss.ai.google.dev/unwnu/32/121072_2.png) [@unwnu](https://discuss.ai.google.dev/u/unwnu)\ **Post date:** [May 11, 2026, 7:29pm UTC](https://discuss.ai.google.dev/t/low-image-quality-in-nano-banana-pro-2-on-vertex-ai-studio/144258/2 "2026-05-11T19:29:10Z")
+1, confirming the same regression on gemini-3.1-flash-image-preview and Pro via Vertex AI starting around 2026-05-07. Our use case is virtual try-on for fashion / clothing, so face and skin quality is load-bearing for us. What you describe matches exactly: - Waxy, over-smoothed skin - Loss of pores and fine texture - Faces look “filtered” — like beauty mode is on by default - Even at imageSize: “4K” the output is softer than identical prompts produced a week ago What we held constant when comparing: - Identical prompt strings (no edits in the codebase) - Identical reference inputs (model photo + garment + studio bg) - Identical generation config; - Identical model ID: gemini-3.1-flash-image-preview - Same Vertex location (“global”) Side-by-side comparison with our archived outputs from late April / early May shows a clear, consistent quality drop across many subjects — not a per-prompt fluke. We’ve had to ship a fallback path to a different provider in the meantime because stakeholders started flagging “plastic faces” in review. We’d strongly prefer to keep Vertex as the primary if/when this is rolled back. ---
**Author:** ![mikessian](https://d1dlmcr85iqnpo.cloudfront.net/user_avatar/discuss.ai.google.dev/mikessian/32/31644_2.png) [@mikessian](https://discuss.ai.google.dev/u/mikessian)\ **Post date:** [May 11, 2026, 7:44pm UTC](https://discuss.ai.google.dev/t/low-image-quality-in-nano-banana-pro-2-on-vertex-ai-studio/144258/3 "2026-05-11T19:44:52Z")
Same here. We are seeing a consistent quality degradation with `gemini-3-pro-image-preview` for real-estate image enhancement workflows. The main issue is not overall resolution. The model is returning true 4K native PNG outputs, but foliage, bushes, and grass often look noticeably softer / blurrier / more painterly than before, while architecture remains relatively sharp. I guess some finish passes for upscaling are not working properly on google’s end. Hope they solve it quick.. ---
**Author:** ![Mustan\_lokhand](https://d1dlmcr85iqnpo.cloudfront.net/user_avatar/discuss.ai.google.dev/mustan_lokhand/32/86726_2.png) [@Mustan\_lokhand](https://discuss.ai.google.dev/u/Mustan_lokhand)\ **Post date:** [May 14, 2026, 2:25am UTC](https://discuss.ai.google.dev/t/low-image-quality-in-nano-banana-pro-2-on-vertex-ai-studio/144258/4 "2026-05-14T02:25:17Z")
Hi Coudl you share some sample prompts and image examples with me via DM ? ---
**Author:** ![Thalison\_Renan](https://d1dlmcr85iqnpo.cloudfront.net/user_avatar/discuss.ai.google.dev/thalison_renan/32/98743_2.png) [@Thalison\_Renan](https://discuss.ai.google.dev/u/Thalison_Renan)\ **Post date:** [May 15, 2026, 6:23pm UTC](https://discuss.ai.google.dev/t/low-image-quality-in-nano-banana-pro-2-on-vertex-ai-studio/144258/5 "2026-05-15T18:23:39Z")
Hello I’m facing the same problem, I made a architectural rendering process, the users get the screen capture using the software, and send to nano banana 2 ou NB pro, and the results looks likes blurrier. When you zoom up the wood floor, or any part of the image, looks like softer ![Design sem nome (51)](https://d3qe71uytubmmx.cloudfront.net/original/3X/4/9/49161c09b917a2257c95a5f60aa93d88fc1c14fb.jpeg) ---
**Author:** ![Mustan\_lokhand](https://d1dlmcr85iqnpo.cloudfront.net/user_avatar/discuss.ai.google.dev/mustan_lokhand/32/86726_2.png) [@Mustan\_lokhand](https://discuss.ai.google.dev/u/Mustan_lokhand)\ **Post date:** [May 15, 2026, 10:14pm UTC](https://discuss.ai.google.dev/t/low-image-quality-in-nano-banana-pro-2-on-vertex-ai-studio/144258/6 "2026-05-15T22:14:09Z")
Hi @Nesjii @unwnu Are you still experiecing this issue ? This should now be resovled ---
**Author:** ![unwnu](https://d1dlmcr85iqnpo.cloudfront.net/user_avatar/discuss.ai.google.dev/unwnu/32/121072_2.png) [@unwnu](https://discuss.ai.google.dev/u/unwnu)\ **Post date:** [May 20, 2026, 11:07am UTC](https://discuss.ai.google.dev/t/low-image-quality-in-nano-banana-pro-2-on-vertex-ai-studio/144258/7 "2026-05-20T11:07:29Z")
Confirming on our side as well. Outputs are back to the expected quality. Thanks. Out of curiosity, can you share what was actually going on? Would help us know what to watch for if something similar shows up again. ---
**Author:** ![Jonathan\_L](https://d1dlmcr85iqnpo.cloudfront.net/user_avatar/discuss.ai.google.dev/jonathan_l/32/31788_2.png) [@Jonathan\_L](https://discuss.ai.google.dev/u/Jonathan_L)\ **Post date:** [May 29, 2026, 12:21pm UTC](https://discuss.ai.google.dev/t/low-image-quality-in-nano-banana-pro-2-on-vertex-ai-studio/144258/8 "2026-05-29T12:21:23Z")
We noticed differences in prompt adherance. Nano Banana 2 on Vertex performed worse than on AI Studio.