ImageMagick：调整图像大小（矩形到正方形）;保持主要对象的宽高比

I have portrait and landscape JPEG images.

我有肖像和风景JPEG图像。

I want to make square thumbnails with white background from all of them. I need to keep the aspect ratio of all images and reduce the larger border to 200px.

我想制作带有白色背景的方形缩略图。我需要保持所有图像的纵横比,并将较大的边框缩小到200px。

I want to use ImageMagick (CLI) but I don't know how to do that. Any idea ?

我想使用ImageMagick(CLI),但我不知道该怎么做。任何的想法 ?

Here is the individual images :

这是个人图片:

1 个解决方案

#1

I think you need this:

我想你需要这个:

convert -background white -gravity center   \
    input.jpg -resize 200x200 -extent 200x200 result.jpg