CODEWITHSUNDEEP
c#bitmapbase64
nirmus
nirmus

Reputation: 5101

Base64Encoded bitmap - convert to bitmap manually

I know I can use 

string base64Encoded = ...; 
byte[] byteArray = Convert.FromBase64String(this.base64Encoded); // array size [31591]

var memoryStream = new MemoryStream(byteArray);
var bitmap = new Bitmap(memoryStream);
//byte[,] im = new byte[a.Width*a.Height,3]; 
// array size [891998, 3] - why this array is 90 times bigger?

but I want to do it manually.

What I really need is to know how from byteArray I can create 3dim pixel array [bitmap.width * bitmap.hight, 3 {Red,Green,Blue}]

Upvotes: 0

Views: 83

Answers (1)

Erdogan Kurtur
Erdogan Kurtur

Reputation: 3685

1- size of byteArray is different from size of bitmap since bitmap is actually an uncompressed 24 bit image without a header, but byteArray is a compressed (RLE most likely) bitmap file.

2- you can use libbmp or another image processing library to load and manipulate pixels. These libraries are much better at handling that kind of stuff.

3- most bitmaps are compressed using RLE compression and bitmap is a very simple format. You can actually write a bitmap reader to read it to a byte array intead of Bitmap object.

Upvotes: 1

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