rem 環境によって変えてね
set im=C:\Progra~1\ImageMagick-6.3.7-Q16
%im%\convert.exe sample5r.jpg -threshold 53000 -negate -matte -channel A
-fx "p.r==1?1:0" -channel rgba -shade 135x23 -blur 0x2 -normalize
sample5r.jpg -compose overlay -composite sample257a.png
元画像(sample5r.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg8Ui760dj0Wa0ReGvppesrtIeyPxQJ7NhVGjfPNRn1_35gs_TJElUj3M4wNW1oSavRBzYVcY-ogBRigbi8ip-CeO1OA4wta_-B585R4OCtvAPCbS5jftit-1RkSgqPc6ZvWgp0/s320/sample5r.jpg)
出力画像( sample257a.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiHJZCzg1hesPutymbDORczgeE5DiakOrukp4nh-DSPmKGk5XMa21Y09T5nFY_ha6N8LznsMQriZLfRABz562epRHvcVdYdMYz3NM4kjHYboIB-cG4Vj4yIMlcSnNmO4bi2riBq/s320/sample257a.png)
関連項目
ImageMagickで2値化したのちグラデーションで塗りつぶす
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