It's a pretty well known problem in the generative image domain. GPT-image-1 (and gpt-image-1.5) are outliers in their ability to generate images with a proper alpha channel.
You can still use other models (Flux, SDXL, NB, etc), you'll just need to request that the image be generated on a solid colored blackground. Then just run it through Rembg [1] or similar background removal tool.
But it's very interesting that ChatGPT can generate with transparent backgrounds where Gemini continues to fails despite being considered as a better image generation model.
The removing background manually not the best approach because it leaves some rough edges and not as smooth as as generating an image with transparent background
vunderba|2 months ago
You can still use other models (Flux, SDXL, NB, etc), you'll just need to request that the image be generated on a solid colored blackground. Then just run it through Rembg [1] or similar background removal tool.
[1] - https://github.com/danielgatis/rembg
rukshn|2 months ago
The removing background manually not the best approach because it leaves some rough edges and not as smooth as as generating an image with transparent background