Read bitmap file using binary reader in c#

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2.11/5 (2 votes)

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I have made a program which displays a bitmap image by using bitmap class.But my actual requirement is to display a bitmap image using binary reader and then convert it into grayscale...please help me out in this.
I just d'not want to use bitmap class,want to accomplish the task by using Binary Reader and after reading the Image using Binary Reader, i require it to be converted into GreyScale, now i hope i have clarified my question.Help!!!

Posted 30-Dec-11 0:03am

Mariyah Malik

Updated 30-Dec-11 20:35pm

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Sergey Alexandrovich Kryukov 30-Dec-11 11:02am

Why this strange way.
--SA

Sergey Alexandrovich Kryukov 30-Dec-11 11:11am

WPF or System.Drawing -- what do you want to use? If you know the answer, add a tag to the question.
--SA

Malik Azhar Awan 30-Dec-11 15:25pm

hahahahah i have also same question means how to convert using binary reader........!!!

3 solutions

Solution 1

If you read a bitmap with a binary reader (i.e. as raw data bytes) and then try to convert it to grayscale manually, then you will have to read up on and implement Bitmap file format - probably a lot more than you need to do, in order to convert an image to greyscale.

There is a tutorial with code on how to do such conversion here: http://www.switchonthecode.com/tutorials/csharp-tutorial-convert-a-color-image-to-grayscale[^]

Posted 30-Dec-11 0:19am

OriginalGriff

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Sridhar Patnayak 30-Dec-11 6:22am

Good link -- my 5

Mariyah Malik 31-Dec-11 2:26am

thanks,but still you are using bitmap class not binary reader...i have worked on this before,this was nice tutorial but not enough for my requirements.hope to see some good help on
"CONVERSION BY BINARY READER"

Solution 4

Try
C# RGB to Palette Based 8-bit Greyscale Bitmap Class[^]

Posted 30-Dec-11 10:43am

RaviRanjanKr

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Sergey Alexandrovich Kryukov · Accepted Answer · 2011-12-30T05:11:00

This is a bad approach, but many reasons. First of all, the two: 1) it's too difficult, unreliable and hard to maintain, 2) absolutely non needed.

Assuming you want to use System.Drawing, you need to do the following:

Use the class System.Drawing.Bitmap; read the bitmap from file using one of its constructors.
Create a target bitmap with the different pixel format (whatever you need, like 8 bits per pixel) and the same size.
Get access to source bitmap and target bitmaps using System.Drawing.Bitmap.LockBits; move data appropriately with the conversion of each bit you need.
PROFIT!

http://msdn.microsoft.com/en-us/library/system.drawing.bitmap.aspx[^],
http://msdn.microsoft.com/en-us/library/5ey6h79d.aspx[^] (find a code sample here).

Important! Don't even think about using GetPixel/SetPixel — it would be too slow.

WPF have its own approach. Look at System.Windows.Media.Imaging.WriteableBitmat, see http://msdn.microsoft.com/en-us/library/system.windows.media.imaging.writeablebitmap.aspx[^].

—SA