ImageMagick按背景色拆分图像 [英] ImageMagick split image by background color
问题描述
我的形象很大 https://buildyourboard.pro/userboards/board -img/data/clipart.png
如何通过透明(或其他)背景将该图像分割成小图像?
图片不在网格中，因此代码应找到图片中每个图片的位置
如果运行此命令，它将把所有像素缩小到只有一个像素宽且具有图像原始高度的图像中.然后，您将看到所有带有单词none的线都对应于可以在图像上绘制水平线而又不与任何板子背景相交的所有位置:
convert boards.png -resize 1x! txt: | more
# ImageMagick pixel enumeration: 1,4667,255,srgba
0,0: (0,0,0,0) #00000000 none
0,1: (0,0,0,0) #00000000 none
0,2: (0,0,0,0) #00000000 none
...
...
...
0,547: (0,0,0,0) #00000000 none
0,548: (0,0,0,0) #00000000 none
0,549: (0,0,0,0) #00000000 none
0,550: (0,0,0,0) #00000000 none
0,551: (0,0,0,0) #00000000 none
0,552: (0,0,0,0) #00000000 none
0,553: (0,0,0,0) #00000000 none
0,554: (0,0,0,0) #00000000 none
0,555: (39038,36633,35446,0) #988F8A00 srgba(152,143,138,0)
0,556: (38889,36248,34984,12) #978D8800 srgba(151,141,136,0.000183108)
0,557: (38348,35253,33873,75) #95898400 srgba(149,137,132,0.00114443)
0,558: (35061,31775,30664,98) #887C7700 srgba(136,124,119,0.00149538)
0,559: (33894,30508,29428,164) #84777301 srgba(132,119,115,0.00250248)
0,560: (34379,30968,29853,243) #86787401 srgba(134,120,116,0.00370794)
现在您可以看到它从水平线什么都没有到东西之间的第一个地方是第555行.因此，基本上，您想要检测它从none变为什么的地方.
这很容易通过awk完成，例如:
convert boards.png -resize 1x! txt: | awk 'inside && /none/{inside=0;print;next} !inside && ! /none/{inside=1;print}'
# ImageMagick pixel enumeration: 1,4667,255,srgba
0,0: (0,0,0,0) #00000000 none
0,555: (39038,36633,35446,0) #988F8A00 srgba(152,143,138,0)
0,911: (0,0,0,0) #00000000 none
0,1082: (36701,34188,35001,0) #8F858800 srgba(143,133,136,0)
0,1433: (0,0,0,0) #00000000 none
0,1570: (33489,32153,32838,4) #827D8000 srgba(130,125,128,6.10361e-05)
0,1937: (0,0,0,0) #00000000 none
0,2135: (29884,28945,29339,4) #74717200 srgba(116,113,114,6.10361e-05)
0,2486: (0,0,0,0) #00000000 none
0,2621: (28668,27300,25241,5) #706A6200 srgba(112,106,98,7.62951e-05)
0,2972: (0,0,0,0) #00000000 none
0,3216: (35066,32529,28581,2) #887F6F00 srgba(136,127,111,3.0518e-05)
0,3612: (0,0,0,0) #00000000 none
所以，现在我们知道我们可以在555、911、1082、1433等行上对图片进行水平切割了.
我将这样绘制前3条线:
convert boards.png -stroke red -draw "line 0,555 12000,555" -draw "line 0,911 12000,911" -draw "line 0,1082 12000,1082" result.jpg
现在，您沿着这些线切开-像这样:
convert boards.png -crop x911+0+0 row1.jpg
convert boards.png -crop x416+911+1082 row2.jpg
然后在垂直方向上执行完全相同的过程，将-resize 1x!替换为-resize x1!.
I have big image https://buildyourboard.pro/userboards/board-img/data/clipart.png
how can I segmentate this image to small images by transparent (or another) background?
Images not in grid, so code should find position of every pic in image
If you run this command, it will scrunch all the pixels up into an image that is just one pixel wide and has the original height of your image. You will then see that all lines that have the word none correspond to all the locations where you can draw a horizontal line across the image without intersecting with any of your board backgrounds:
convert boards.png -resize 1x! txt: | more
# ImageMagick pixel enumeration: 1,4667,255,srgba
0,0: (0,0,0,0) #00000000 none
0,1: (0,0,0,0) #00000000 none
0,2: (0,0,0,0) #00000000 none
...
...
...
0,547: (0,0,0,0) #00000000 none
0,548: (0,0,0,0) #00000000 none
0,549: (0,0,0,0) #00000000 none
0,550: (0,0,0,0) #00000000 none
0,551: (0,0,0,0) #00000000 none
0,552: (0,0,0,0) #00000000 none
0,553: (0,0,0,0) #00000000 none
0,554: (0,0,0,0) #00000000 none
0,555: (39038,36633,35446,0) #988F8A00 srgba(152,143,138,0)
0,556: (38889,36248,34984,12) #978D8800 srgba(151,141,136,0.000183108)
0,557: (38348,35253,33873,75) #95898400 srgba(149,137,132,0.00114443)
0,558: (35061,31775,30664,98) #887C7700 srgba(136,124,119,0.00149538)
0,559: (33894,30508,29428,164) #84777301 srgba(132,119,115,0.00250248)
0,560: (34379,30968,29853,243) #86787401 srgba(134,120,116,0.00370794)
Now you can see that the first place where it goes from there being nothing in a horizontal line to there being something is at line 555. So basically, you want to detect where it changes from none to something.
That is readily done through awk like this:
convert boards.png -resize 1x! txt: | awk 'inside && /none/{inside=0;print;next} !inside && ! /none/{inside=1;print}'
# ImageMagick pixel enumeration: 1,4667,255,srgba
0,0: (0,0,0,0) #00000000 none
0,555: (39038,36633,35446,0) #988F8A00 srgba(152,143,138,0)
0,911: (0,0,0,0) #00000000 none
0,1082: (36701,34188,35001,0) #8F858800 srgba(143,133,136,0)
0,1433: (0,0,0,0) #00000000 none
0,1570: (33489,32153,32838,4) #827D8000 srgba(130,125,128,6.10361e-05)
0,1937: (0,0,0,0) #00000000 none
0,2135: (29884,28945,29339,4) #74717200 srgba(116,113,114,6.10361e-05)
0,2486: (0,0,0,0) #00000000 none
0,2621: (28668,27300,25241,5) #706A6200 srgba(112,106,98,7.62951e-05)
0,2972: (0,0,0,0) #00000000 none
0,3216: (35066,32529,28581,2) #887F6F00 srgba(136,127,111,3.0518e-05)
0,3612: (0,0,0,0) #00000000 none
So, now we know we can make horizontal cuts across the picture at lines 555, 911, 1082, 1433 etc.
I will draw the first 3 such lines in like this:
convert boards.png -stroke red -draw "line 0,555 12000,555" -draw "line 0,911 12000,911" -draw "line 0,1082 12000,1082" result.jpg
Now, you cut along those lines - like this:
convert boards.png -crop x911+0+0 row1.jpg
convert boards.png -crop x416+911+1082 row2.jpg
Then apply exactly the same procedure in the vertical direction, replacing -resize 1x! with -resize x1!.
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