In NiFi how to crop image?

Question

I have Kafka messages sending face of the person in crowd. I want to crop a specific portion of this image based on co-ordinates provided. How can I do this in NiFi? Do I need to use imagemagick on Windows NT and in linux the following command: mogrify -crop {Width}x{Height}+{X}+{Y} +repage image.png?

Execute this command using - ExecuteStreamCommand processor?

I refer to : Command line batch image cropping tool

Answer 1

you can use ExecuteGroovyScript processor with following code:

import java.awt.image.BufferedImage
import javax.imageio.ImageIO


def ff = session.get()
if(!ff)return

ff.write{rawIn, rawOut->
    BufferedImage img = ImageIO.read(rawIn) //read image from flowfile input stream
    def x=100,y=200,endX=800,endY=600
    img = img.getSubimage(x, y, endX, endY) //crop
    ImageIO.write(img, "png", rawOut)       //write transformed image into flowfile as PNG
}

REL_SUCCESS << ff //transfer to success