Bitmap/Histogram: Difference between revisions

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 =={{header|J}}==
-'''Solution:'''
+'''Solution'''
+Using <code>toGray</code> from [[Grayscale image#J|Grayscale image]]:
 <lang j>
 getImgHist=: ([: /:~ ~. ,. #/.~)@,
@@ Line 363: / Line 365: @@
 '''Example Usage:'''
+Using
+Use [http://rosettacode.org/mw/images/b/b6/Lenna100.jpg Lenna100.jpg] for testing (read using the [[j:Addons/media/platimg|media/platimg]] addon and convert to ppm file).
 <lang j>
+   require 'media/platimg'
-NB. read jpg and write ppm
-   'lenna100.ppm' writeppm~ 256#.inv readimg 'lenna100.jpg'
+   'Lenna100.ppm' writeppm~ 256#.inv readimg 'Lenna100.jpg'
+</lang>
-NB. Write black and white version to file
-   'lenna100BW.ppm' writeppm~ toColor toBW readppm 'lenna100.ppm'
+Read ppm, convert to black and white and write to a ppm file using <code>writeppm</code>, <code>readppm</code> and <code>toColor</code> from other pages.
+<lang j>
+   'Lenna100BW.ppm' writeppm~ toColor toBW readppm 'Lenna100.ppm'
 </lang>