Creating your own image data files

Simple file output in C#

using System.IO;…StreamWriter file = new StreamWriter( "c:\\out.txt" );file.WriteLine( "hello, world." );…file.close();

Note from Microslip: Any similarities between the C# StreamWriter class and Java’s PrintWriter class are purely coincidental.

P2 = ASCII grey PGM

• Each pixel has one integer (grey) value.

P2w hmaxvalv1 v2 v3 …. . .. . . . . . vw*h

P3 = ASCII color PPM

• Each pixel’s color is represented as three consecutive values, <red,green,blue>.

P3w hmaxvalv1r

v1g v1b

v2r v2g

v2b

. . .

. . . . . . vw*hr vw*hg

vw*hb

Write a simple C# program that creates an image of the sin function.– file format: pgm (P2 / grey)– file name: out.pgm– sin function:• width/domain/x: [0..2Pi]• y: real numbers [-1.0..+1.0]

– image:• width: 500 pixels ({0,..,499})• height: 250 pixels (repeat values from sin 250 times)• pixel values: integers {0,…,255}

Exercise

• Load result into your CSImageviewer; send a screen capture to me.

• Email your code (that produced the image data file) to me.

• The email subject must be CV sin assignment.

Exercise

Same values across each line repeated over and over and over for every line.