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NetPBM Image Format Exercises

NetPBM Image Format Exercises. http://netpbm.sourceforge.net/README. Creating Sample NetPBM images. Using the examples in the NetPBM man pages for pbm, pgm, and ppm Use a text editor to create the corresponding sample images feep.pbm feep.pgm feep.ppm

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NetPBM Image Format Exercises

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  1. NetPBM Image Format Exercises http://netpbm.sourceforge.net/README

  2. Creating Sample NetPBM images • Using the examples in the NetPBM man pages for pbm, pgm, and ppm • Use a text editor to create the corresponding sample images • feep.pbm • feep.pgm • feep.ppm • If you are unfamiliar with using any of the UNIX text editors, startup the tutorial on the CIS systems % ~rvrpci/pub/vitutor/vitutor or check out http://ecn.www.ecn.purdue.edu/ECN/Documents/VI/ http://www.ncsu.edu/it/pub/tutorials/pico_tutor/pico.html • Use the xv utility to display these sample images

  3. Index Example • Use the pnmindex routine • make a single image catalog of the images feep.pbm, feep.pgm, feep.ppm

  4. Rotate Example • Taking the image feep.pbm you created • Rotate the image counter clockwise using one of the NetPBM utilities

  5. Flip Example • Taking the image feep.pgm you created • Flip the image

  6. Cut example • Taking the image feep.pgm • Cut out the subimage shown below

  7. Image Concatenation Example • Taking the results from the previous slides • Index, Rotate, Flip, Cut • Concatenate the results of these processes into one image

  8. Histogram Example • Compute the histogram of feep.pgm and plot it using any UNIX plotting utility • Normalize the feep.pgm and repeat the histogram plot • Based on the output of pgmhist • Come up with a strategy of how you might compute the following • Min, max, sum, mean, variance, standard deviation • Do not try to implement anything yet, simply state in a stepwise manner what needs to be done • As we get exposed to other UNIX utilities, we will implement and write scripts that will compute these values.

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