create a grayscale image with an array of values

Question

I have a single dimensional array with 8 values. I want to create a grayscale image with those values. The image consist of a square with provided width and length. inside that square i want to produce circles with array values. The values from the array will be the radius of the circles. I need a grayscale image of that circle. Any help???

Do you mean you want 8 concentric circles based on 8 radii and the centres are all in the middle of the square? What is grey - the background? The circle perimeters? — Mark Setchell, Aug 14 '14 at 10:22
Yes, 8 concentric circles based on the radii and centers are all in the middle of the square. Gray color is for circle perimeters. The size of the circle varies according to the values. When the size of the circles increases, i need variation in the gray color according to the increasing factor, that is radius of the circle. — Rohit Rajagopal, Aug 14 '14 at 10:50

Mark Setchell · Accepted Answer · 2014-08-14T16:29:26.723

You can use ImageMagick for this, either directly from the commandline or from C/C++, Perl, Python, PHP etc.

Start with convert to get a white square 100pixels by 100pixels.

convert -size 100x100 xc:white circles.jpg

Change colour or file extension as you wish, e.g.

convert -size 200x200 xc:black circles.gif

Now add two circles with centre 50,50

convert -size 100x100 xc:white \
    -draw "circle 50,50,60,50" \
    -draw "circle 50,50,70,50" \
    circles.jpg

The \ is just a line continuation.

Back at my desk now.... so, here is a command:

#!/bin/bash
convert -size 400x400 xc:white  -fill transparent \
   -stroke gray90  -draw "circle 200,200,260,200" \
   -stroke gray80  -draw "circle 200,200,280,200" \
   -stroke gray70  -draw "circle 200,200,300,200" \
   -stroke gray60  -draw "circle 200,200,320,200" \
   -stroke gray50  -draw "circle 200,200,340,200" \
   -stroke gray40  -draw "circle 200,200,360,200" \
   -stroke gray30  -draw "circle 200,200,380,200" \
   -stroke gray20  -draw "circle 200,200,400,200" \
    circles.jpg

and the result:

enter image description here

Maybe you can execute it in Java with:

Runtime.exec(...)

Maybe add a Java tag to your question... See http://stackoverflow.com/questions/5150503/image-magick-java — Mark Setchell, Aug 14 '14 at 14:00

create a grayscale image with an array of values

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