python - Image Conversion - Cannot write mode RGBA as JPEG

Question

I'm trying to resize & reduce quality of image before upload in project. Here's what I tried,

def save(self):
    im = Image.open(self.image)
    output = BytesIO()
    im = im.resize(240, 240)
    im.save(output, format='JPEG', quality=95)
    output.seek(0)
    self.image = InMemoryUploadedFile(output, 'ImageField', "%s.jpg" % self.image.name.split('.')[0], 'image/jpeg', sys.getsizeof(output), None)
    super(Model, self).save()

It's working fine if I upload a jpg image but if I upload a png or any other image type, it's not working it's raising errors like cannot write mode RGBA as JPEG & cannot write mode P as JPEG etc.

How can we fix that? Thank You!

Answer 1

If your image.mode is "P" or "RGBA" and you want to convert it to jpeg then you need to first convert the image.mode because the previous modes aren't supported for jpeg

if im.mode in ("RGBA", "P"):
    im = im.convert("RGB")

https://github.com/python-pillow/Pillow/issues/2609