Created
April 4, 2023 19:15
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WebpImageField for Django
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| from io import BytesIO | |
| from django.db.models.fields.files import ImageField | |
| from PIL import Image | |
| """ | |
| This field will automatically convert your jpg/png files to webp | |
| Usage: | |
| Replace your ImageField with this one. | |
| Parameters: | |
| webp_quality: Integer, 0-100, Defaults to 80. For lossy, 0 gives the smallest size and 100 the largest. | |
| For lossless, this parameter is the amount of effort put into the compression: | |
| 0 is the fastest, but gives larger files compared to the slowest, but best, 100. | |
| webp_lossless: if present and true, instructs the WebP writer to use lossless compression. | |
| webp_method: Quality/speed trade-off (0=fast, 6=slower-better). Defaults to 4. | |
| """ | |
| class WebPImageField(ImageField): | |
| def __init__(self, verbose_name=None, name=None, width_field=None, height_field=None, **kwargs): | |
| self.webp_quality = kwargs.pop('webp_quality', 80) | |
| self.webp_lossless = kwargs.pop('webp_lossless', False) | |
| self.webp_method = kwargs.pop('webp_method', 4) | |
| super(WebPImageField, self).__init__(verbose_name, name, width_field, height_field, **kwargs) | |
| def save_form_data(self, instance, data): | |
| if data: | |
| image = Image.open(data) | |
| image = image.convert("RGB") | |
| webp_image_name = f"{data.name.rsplit('.', 1)[0]}.webp" | |
| webp_image_bytes = BytesIO() | |
| image.save( | |
| webp_image_bytes, | |
| "WEBP", | |
| quality=self.webp_quality, | |
| lossless=self.webp_lossless, | |
| method=self.webp_method | |
| ) | |
| webp_image_bytes.seek(0) | |
| data.file = webp_image_bytes | |
| data.name = webp_image_name | |
| super().save_form_data(instance, data) |
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