Question

I'm trying to resize images while keeping aspect ratio. I use PIL's thumbnail method for this. I use Image.ANTIALIAS filter.

You can check my code here:

        image = Image.open(design.design.path)
        format = image.format
        image = ImageOps.mirror(image)
        new_size = (241, 241)
        image.thumbnail(new_size, Image.ANTIALIAS)
        image.save(response, format)

This code works perfectly however quality is lost after thumbnail. I can see it by zooming in on the saved image. I can see pixels at the corners of the image while I don't on the original image. This is seen even better when I print out resized image.

You can check out sample images here: http://imgur.com/a/ifZoU

Please tell me if you need anything else

Answer 1

Image.save为您提供了选项：

img.save(fpath, 'image/png', quality=100, optimize=True)

Answer 2

如果您正在制作基于像素的图像的缩略图，当然您会失去质量。重新调整这种图像（与矢量图像相对）只是简单地抛弃信息 - 没有办法恢复它。

如果您需要以完整尺寸查看图像，则必须保留原始图像，并将缩小版本仅显示在需要的位置 - 将原始图像用于其他所有图像。

https://en.wikipedia.org/wiki/Raster_graphics

Python PIL thumbnail with Image.ANTIALIAS. How to preserve quality

2 个答案: