Nano Banana generate tool changes size of image when generating

Yup that seems to 'solve' the problem. Obviously they ned to get this truly fixed but it's good to know about the workaround - thank you!

Not letting me update my last post. I had posted originally and it  didn't take. I copied and pasted it in a different browser and it somehow added $ signs and math lol.

-Change a 1000x1500 canvas to 1500x1500.

🙂

sidebar: can you not edit/delete your posts?

Found a workaround!

After trying several things, I realized that if you use anything other than a 1:1 canvas ratio (a perfect square), the image tends to stretch either horizontally or vertically during the generation process.

The quick fix that's been working for me is to extend the canvas size to match the largest side, which creates a 1:1 ratio.

Example:

-Change a $1000 \times 1500$ canvas to $1500 \times 1500$.

-Run your prompt. Since the canvas is square, the stretching should be eliminated.

-Crop the image back to its original dimensions.

It's a small extra step, but a very effective workaround for now.

Hope this helps!

The same problem!

I couldn't with my current projects due to NDA nature of them (this is a public forum), but it literally happens pretty much every time, so I am surprised you even need proof here. Every time I use nano banana - it changes the scale or aspect ratio of the the image I am working on or have outlined in a rectangular marquee as a tutorial provided by Photoshop taught me to do.  I'll try to get you a non NDA sample when I get some free time, but I swear it should be super easy to replicate error, unless it somehow really only applies to me, which seems unlikely.

I'm having the exact same issue. After using generative fill, the resulting image is stretched horizontally quite a bit, enough to notice and have to fix. It's especially weird with human subjects because their faces become quite thick and unrealistic. 

I'm on Sequoia 15.7.1
Photoshop 27.0.0

Gemini 2.5 (Nana Banana) and FLUX is NOT showing up as on option when I enable Generative Fill. Only the lower quailty Firefly is available. Why is Gemini 2.5 not showing up anymore in the latest Beta version (27.0.1) of Photoshop. It WAS available in Beta 27.0. Can Adobe support quickly fix this issue?

Problem with the beta version 27.0.1 of Photoshop, I can't work with Nano Build. Who has this happened to? What is the solution? on mac

Hi @Zebbler2 could you share some screenshots of before and after showing this we can send to the team?

Thanks,

Cory - Photoshop Product Manager

When using the Gemini 2.5 (Nano Banana) model for Generative Fill, the resulting image is stretched (horizontally) a little bit.  It's not pixel-accurate.  Using the Flux Kontext Pro model results in pixel-accurate generations.

If you start to stack multiple generations of Gemini 2.5, the final image can be significantly distorted from your original source.

Version: 27.0

Platform + OS: Windows 11

Steps to Reproduce the Problem:

1. Open any image.
2. Select All

3. Generative Fill with Gemini 2.5

4. Toggle the result on and off, you'll notice pixel stretching.

Example:

Original Image:

Generative Fill prompt: "change the weather to be a beautiful sunny day with no clouds"

Result with Flux Kontext: Pixel accurate

Result with Gemini 2.5: stretches a little horizontally

If you stack multiple generations (to keep making changes) it keeps stretching the image each time, to the point where after a few 'iterations' your image is no longer matching the original.

Result with Gemini 2.5 after multiple iterations:

Note the shift when viewing the origina layer compared to the generated ones

This stretching does not happy with Flux Kontext Pro, so it's something related to Gemini 2.5.

thanks!
Dan