Hi guys!, i'm trying to merge two images previously stored in odoo fields. To do that, i'm using PIL library in this way:

Get and transform both images in PIL Image objects:

image_pil_1 = Image.open(BytesIO(base64.b64decode(image_odoo_1)))

image_pil_2 = Image.open(BytesIO(base64.b64decode(image_odoo_2)))

Then i deal with these images to generate final PIL Image object (i simply use blend method):

image_pil_final = Image.blend(image_pil_1, image_pil_2, 0.5)

Finally, transform and return final image in b64encode:

return base64.b64encode(image_pil_final.tobytes())

This return statement gives back (technically) the image to display into a binary field stored in my odoo db in the following way:

<field name="product_img" readonly="1" nolabel="1" widget="image"/>

But i'm getting this error:

"The selected image could not be displayed!"

I would like to ask what's wrong with my code and how's the correct way to achieve this. Thanks so much in advance and wait for any help!