在图像顶部添加边框，而无需使用imagemagick调整大小

问题描述

这是乌龟的100x67像素图片:

如果我在图像上添加边框，如下所示:

 转换turtle.png-边框50x50 turtle-border.png 

ImageMagick在我的原始图像周围添加边框，将尺寸增加到200x167px.

如何在不调整尺寸的情况下在乌龟图像的顶部绘制边框?是的，我知道乌龟的头和脚不再可见.

解决方案

要创建在图像中吃"的边框，请使用在图像上放置一个矩形的操作.

  convert turtle.png-填充gray75 \-绘制'矩形0 0 100 33'\turtle-border.png 

Here is a 100x67px image of a turtle:

If I add a border to my image like so:

convert turtle.png -border 50x50 turtle-border.png

ImageMagick adds border around my original image, increasing the dimensions to 200x167px.

How do I paint a border on top of my turtle image without resizing the dimeions? Yes, I know the turtle's head and feet will no longer be visible.

解决方案

To create a border that's "eating" into the image, use -shave to reduce the image, then -extent it back to original size.

convert turtle.png -background gray75 \
        -shave 10x10 \
        -extent 100x67-10-10 \
        turtle-border2.png

Previous answer

Use the -draw operation to place a rectangle over the image.

convert turtle.png -fill gray75 \
        -draw 'rectangle 0 0 100 33' \
        turtle-border.png

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