Answer to Question #5837 in C# for Mariyah
2012-01-05T08:44:25-05:00
i want to read bitmap file with binary reader,without using bitmap class, and then convert it into gray scale
1
2012-01-05T12:37:41-0500
As we have understood you need to convert image in byte form to gray scale also in byte form. See code snippets //Open file into a filestream and //read data in a byte array. byte[] ReadFile(string sPath) { //Initialize byte array with a null value initially. byte[] data = null; //Use FileInfo object to get file size. FileInfo fInfo = new FileInfo(sPath); long numBytes = fInfo.Length; //Open FileStream to read file FileStream fStream = new FileStream(sPath, FileMode.Open, FileAccess.Read); //Use BinaryReader to read file stream into byte array. BinaryReader br = new BinaryReader(fStream); //When you use BinaryReader, you need to & //supply number of bytes to read from file. //In this case we want to read entire file. //So supplying total number of bytes. data = br.ReadBytes((int)numBytes); return data; } //Once you have image byte array //you transform to gray scale like this byte[] TransformToGrayscale(byte[] imageArr) { byte[] result = new byte[imageArr.Length]; for(int i=0;i<imageArr.Length;i++) { result[i] = (byte)(imageArr[i] >> 8); } return result; }
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