如何使用网格分割图像并保留透明边界框 [英] How to split an image with a grid and preserve transparency bounding box
问题描述
我有一些png图片，我想将其分成几部分，例如按网格或大小.
I have some png images that I want to split it into parts, like by grid or size.
但是每个部分都应具有与原始图像相同的边界框(透明度).
But each part should have the same bounding box (transparency) as original image.
示例:
将图像分成两部分.
原文:200××89
输出:
part_1.png，200××89
part_1.png, 200 × 89
part_2.png，200××89
part_2.png, 200 × 89
ImageMagick可以这样做吗?或任何其他应用程序或方法.
Can ImageMagick do this? Or any other app or method.
我的实际目标是将图像分割成100多个切片.
My actual goal is to split into 100+ slices images.
另一个目标是每个切片都有一个缩进.说indent = 10px.
Another goal to have an indents for each slice. Say indent = 10px.
示例:
输入: 200 x 100
Input: 200 x 100
输出:
part_1.png，200 x 100
part_1.png, 200 x 100
part_2.png，200 x 100
part_2.png, 200 x 100
作为示例，以可视方式比较输入和输出:在Photoshop中合并的输出图像作为一层添加到另一层 200 x 100:
And just as example, to visually compare input and output: combined output images in Photoshop as layer added one onto another 200 x 100 :
这也显示了添加到组合中的输入图像(因此最好查看裁剪的内容和方式):
Also this is showing input image added onto combined(so it's better to see what was cropped and how):
推荐答案
在ImageMagick中，您可以使用-crop命令将图像分为多个部分.对于上面的示例，该示例分为两部分，您可以使用以下命令来完成. ImageMagick将在输出文件名后附加-0，-1....
In ImageMagick, you can split an image into many parts with the -crop command. For your example above with two parts, you can do that with the following commands. ImageMagick will append -0, -1 ... to the output file names.
ImageMagick 6:
ImageMagick 6:
dim=`convert image.png -format "%wx%h" info:`
convert \( -size $dim xc:none \) null: \( image.png -crop 50x100% \) -layers composite result.png
ImageMagick 7:
ImageMagick 7:
magick \( image.png -set option:dim "%wx%h" -crop 50x100% \) null: \( -size "%[dim]" xc:none \) -reverse -layers composite result.png
结果是:
请参见
http://www.imagemagick.org/Usage/crop/#crop http://www.imagemagick.org/Usage/crop/#crop_percent http://www.imagemagick.org/Usage/crop/#crop_tile http://www.imagemagick.org/Usage/crop/#crop_quad http://www.imagemagick.org/Usage/crop/#crop_equal
http://www.imagemagick.org/script/command -line-options.php#layers
请注意，如果您之后不添加+ repage，则-crop保留虚拟画布信息.因此，要将单个图像放回原始位置，必须将它们合成到输入大小的透明背景上.这是在使用-layers组合的命令中使用null:分隔符完成的.
Note that -crop keeps the virtual canvas information if you do not add +repage afterwards. So to put the individual images back into their original placement, you have to composite them onto a transparent background the size of the input. That is done in one command using -layers composite using the null: separator.
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