Net PBM Image Format Exercises http netpbm sourceforge

Net. PBM Image Format Exercises http: //netpbm. sourceforge. net/README Rolando V. Raqueño 1 Saturday, October 30, 2021

Creating Sample Net. PBM images • Using the examples in the Net. PBM 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 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 Rolando V. Raqueño 2 Saturday, October 30, 2021

Index Example • Use the pnmindex routine – make a single image catalog of the images feep. pbm, feep. pgm, feep. ppm Rolando V. Raqueño 3 Saturday, October 30, 2021

Rotate Example • Taking the image feep. pbm you created – Rotate the image counter clockwise using one of the Net. PBM utilities Rolando V. Raqueño 4 Saturday, October 30, 2021

Flip Example • Taking the image feep. pgm you created – Flip the image Rolando V. Raqueño 5 Saturday, October 30, 2021

Cut example • Taking the image feep. pgm – Cut out the subimage shown below Rolando V. Raqueño 6 Saturday, October 30, 2021

Image Concatenation Example • Taking the results from the previous slides – Index, Rotate, Flip, Cut – Concatenate the results of these processes into one image Rolando V. Raqueño 7 Saturday, October 30, 2021

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. 8 Rolando V. Raqueño Saturday, October 30, 2021