ImageMagick在不缩放图像的情况下更改宽高比 [英] ImageMagick change aspect ratio without scaling the image

问题描述

我有大量的图像，可以是我需要的任何尺寸，以相同的宽高比（基本上是正方形）。因此，如果一个图像是100x300，则输出应为300x300。我不想要的是以任何方式缩放或拉伸的图像。我只想要一个背景颜色（白色）应用于图像的两侧，然后原始图像居中（垂直或水平取决于原始的宽高比）。

I have a large number of images that can be any dimension that I need make into the same aspect ratio (basically square). So if one image is 100x300 the output should be 300x300. What I don't want is the image scaled or stretched in any way. I just want a background color (white) applied to the sides of the image, then the original image centered (either vertically or horizontally depending on the original aspect ratio).

我已经玩了几个不同的转换命令，但我还没有找到神奇的命令 - 它们都会扭曲图像以达到纵横比，或者将图像缩放到正确的更大尺寸，但是没有方面比率我正在寻找。

I've played around with a couple different convert commands, but I have not found the magic one yet - they all either distort the image to reach the aspect ratio, or scale the image to the correct larger dimension, but do not have the aspect ratio I was looking for.

提前致谢

推荐答案

convert input.png -background white -gravity center -extent 100x300 -flatten output.png

请参阅 http://www.imagemagick.org/Usage/crop/#extent

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