如何将图像切割成碎片，随机化并将它们放在一起 [英] How to cut image into pieces, randomize them and put all together

问题描述

我想将图像（orig.jpg）剪切成16px x 16px的片段，随机化它们的顺序并将它们放在一起形成相同大小的新图像（jpg）。基本上是马赛克效果，但没有订单。

I want to cut an image (orig.jpg) into 16px x 16px pieces, randomize their order and put them to a new image (jpg) of same size together. Basically a mosaic effect, but with no order.

拆分不是问题

convert -crop 16x16@ orig.jpg  tile_%d.jpg

但我有不知道如何将它们随机放在一起......

but I have no clue how to randomly put them together...

montage 

我应该这样做。我之前做过，但找不到脚本：-S

should do the trick I guess. I did it before, but cannot find the script :-S

使用全部：我需要具有完全相同颜色和亮度的图像，但它不应该是可以识别原始图像。

The use of all: I need images with exact the same colors and brightness, but it shouldn't be possible to recognize the original image.

推荐答案

你可以用 bash 和 ImageMagick ：

#!/bin/bash
convert -crop 16x16@ input.jpg tile.jpg
montage -geometry +0+0 $(ls tile*jpg | awk 'BEGIN{srand()}{print rand() "\t" $0}' | sort -n | cut -f2-) output.png

# Remember to remove the tile*jpg before you do another one :-)
# rm tile*jpg

基本上如你所知，使用 -crop 和蒙太奇。 $（）中的位是进程替换，它会在括号内运行该进程并将其放入蒙太奇命令。它列出了所有名为 tile * jpg 的文件，并将其输入 awk ，以便在每个文件的前面附加一个随机数，然后按随机数排序并将其剔除。

Basically as you suggest, using -crop and montage. The bit inside $() is process substitution and it takes the result of running the process inside the parentheses and puts it into the montage command. It lists all files called tile*jpg and pipes that into awk to append a random number to the front of each file, then it sorts by the random number and chops it off.

所以这样做：

进入：

我一直在进一步尝试这个（即玩耍），我发现你可以在瓷砖之间获得白线和间隙。我不确定这些是否会让您感到困扰，但如果他们这样做，可能的解决方案是记下原始图像几何体，然后将其调整为16x16瓷砖大小的精确倍数。然后像以前一样继续，并按结束时的奇数0-15像素调整大小，恢复到原始大小。

I have been experimenting further with this (i.e. playing around) and I see you can get white lines and gaps between the tiles. I am not sure if these bother you, but if they do, a possible solution is to note the original image geometry and then resize it to an exact multiple of your 16x16 tile-size. Then proceed as before, and resize by the odd 0-15 pixels at the end, back to the original size.

如果有必要，我想出了这个：

If that is necessary, I came up with this:

#!/bin/bash
# Get original image geometry
origgeom=$(identify -format %g input.jpg)
echo $origgeom
# Calculate new geometry as exact multiple of tilesize
newgeom=$(convert input.jpg -format "%[fx:int(w/16)*16]x%[fx:int(h/16)*16]" info:)
echo $newgeom

# Resize to new geometry and tile
convert input.jpg -resize $newgeom -crop 16x16@ tile.jpg

# Rebuild in random order then correct geometry
montage -background none -geometry +0+0 $(ls tile*jpg | awk 'BEGIN{srand()}{print rand() "\t" $0}' | sort -n | cut -f2-) JPG:- | convert JPG: -resize ${origgeom}! output.jpg

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