Question

我正在尝试验证表单级别的图像尺寸，如果提交的照片不符合图像尺寸1080x1920的要求，则会向用户显示一条消息。我不想在数据库中存储宽度和高度大小。我尝试使用Imagefield width和height属性。但这不起作用。

INSERT

Answer 1

您可以通过两种方式完成

模型验证

从django.core.exceptions

导入ValidationError

def validate_image(image):
    max_height = 1920
    max_width = 1080
    height = image.file.height 
    width = image.file.width
    if width > max_width or height > max_height:
        raise ValidationError("Height or Width is larger than what is allowed")

class Photo(models.Model):
    image = models.ImageField('Image', upload_to=image_upload_path, validators=[validate_image])

表格清洁

        def clean_image(self):
            image = self.cleaned_data.get('image', False)
            if image:
                if image._height > 1920 or image._width > 1080:
                    raise ValidationError("Height or Width is larger than what is allowed")
                return image
            else:
                raise ValidationError("No image found")

Answer 2

我们需要一个图像处理库，例如 PI 来检测图像尺寸，这里是正确的解决方案：

# Custom validator to validate the maximum size of images
def maximum_size(width=None, height=None):
    from PIL import Image

    def validator(image):
        img = Image.open(image)
        fw, fh = img.size
        if fw > width or fh > height:
            raise ValidationError(
            "Height or Width is larger than what is allowed")
     return validator

然后在模型中：

class Photo(models.Model):
    image = models.ImageField('Image', upload_to=image_upload_path, validators=[maximum_size(128,128)])

特定宽度和高度的Django Form Imagefield验证

2 个答案: