Nano Banana generate tool changes size of image when generating

[Zebbler2]

It's a consistent thing I am seeing when generating things like "new hair color" or altering anything about the image I am working with - the new generation is great, but is almost always different size from the original image, either stretched a little bit, or squished, or larger, or shifted in space, but never exactly perfectly blended with the original image - so it takes a bit of effort to blend the new generation back into the original image.
Seems like a bug vs. a feature to me 🙂

27.0.0 release
Mac OSX Sequoia 15.6.1

[Rafael _ Oz]

i'm having an issue using the "nano banana" model with Generate Fill in Photoshop Beta.

When I generate with a selection that covers the entire image, it works fine and uses the reference photo.

But when I generate using only part of the image (for example, a small selection), the returned result is smaller than the selected area, although the content matches the reference photo. It creates a new layer with the result at a much smaller size and lower resolution. I understand the resolution may be lower than a high‑resolution source, but unlike Firefly it does not produce the result at the exact size of the selection, and I have to manually scale it up using Transform.

[Pete.Green]

Hi @Rafael _ Oz ,

Can you provide a screenshot of what you're seeing?

It'd be great to know how big the image is, what your selection looks like, and what the results are if possible.

Regards,

Pete

[DGoldwas]

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

 

[kind_thinker6068]

I have the opposite problem; after generating, my image gets enlarged.

[CShubert]

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

Thanks,

Cory - Photoshop Product Manager

[Boroda5CC6]

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

[Wayne5CB9]

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?

[Sleestak_1]

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

[Zebbler2]

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.

[Dmitriy32236602oe43]

The same problem!

[tauntt]

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!

[tauntt]

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?

[DGoldwas]

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!

[Zebbler2]

Amazing! Thanks for sharing, I'll try that on my next set of edits ❤️

[_bxn_ukx]

This is what I get. Even i scale the canvas and image size to 1000x1000, it doesn't fix a thing

[oliviano]

Same issue here,

The 1x1 Ratio for the marquee selection trick doesn't seem to be working, at least not consistently across generation with NanoBanana.

[Zebbler2]

Oh no, too good and too easy to be true advice was dispersed?
Ok, gotta wait for a tricky technical fix from Adobe and Google then....