ROI done!

I found where the problem is 
Right click on the image in GIMP -> color -> mapping -> rearrange color map
then you can drag the color blocks to sort as the sequence you want.
You don't need to "fill in" the colors 

This is much better than the tutorial PDF made by predecessor.




--
吳浩民 Howard Wu
政治大學英語教學所  102551020@nccu.edu.tw
您可以透過 https://db.tt/XtqMCbI  加入dropbox

我是Ptt以下三個板的板主,歡迎跟我討論這些話題
Battery, Browsers, Scenarist
或是有關Linux、自由軟體、電動車、英語教學、語言學、哲學、西洋文學

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