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mac 系统下,要制作 telegram 表情包,需要将图片转化为 png 格式并有特定尺寸要求,怎么办?

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brew install imagemagick 
convert 1.jpg 2.png

The image file should be in PNG format with a transparent layer and must fit into a 512x512 square (one of the sides must be 512px and the other 512px or less).

convert -resize 512x512 2.png 3.png

两条命令合成一条

convert -resize 512x512 1.jpg 2.png