image - 图像调整大小，保持图像大小 - 初学者问题

Question

我试图将图像的大小从 480x800 调整为 320x240。以下是结果。原始图像具有椭圆形的圆形，而调整大小的图像具有更球形的形状。是否可以调整原始图像的大小，使圆形和矩形保持原始比例但更小？

imagemagick 或 gimp（或其他软件）可以实现这一点吗？

Answer 1

Here's Imagemagick solution.

1) If you want large image to just fit 320x240 box and leave proportions, use:

convert test.png -size 320x240 resized.png

That will produce image sized 144x240.

http://www.imagemagick.org/Usage/resize/#resize

2) If you want large image to completely fill a specific image size, use:

convert test.png -resize 320x240\> \
    -size 320x240 xc:blue +swap -gravity center -composite \
    resized.jpg

That will produce image sized 320x240 with resized big image in center and blue fill on sides.

http://www.imagemagick.org/Usage/resize/#space_fill