How is a bitmap image converted into a monochrome image?

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How can I convert a bitmap image into a ~~binary~~ monochrome image?

Posted 25-Jun-10 22:14pm

Sweety Khan

Updated 27-Jun-10 0:10am

Niklas L

v3

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Richard MacCutchan 26-Jun-10 4:55am

Please explain what your problem is, a bitmap is already stored in binary.

Sandeep Mewara 26-Jun-10 8:20am

What do you mean by bitmap image into binary? It must already be stored in binary format!

Sweety Khan 26-Jun-10 9:45am

i m using 24 bit bitmap.
A binary image has only two values for each pixel, 0 and 1 corresponding to black and white (or vice versa).

Niklas L 27-Jun-10 6:11am

Changed your question to point out that you are interested a monochrome image.

3 solutions

Solution 2

Use CreateBitmap to create a bitmap of teh same size, 1 bit for color and 1 bit for depth. Select it into a DC (say DestDC).
Select the source bitmap into another DC (say SourceDC), than set the source DC background color (via SetBkColor) to the color you will make white in the destination(the rest will be black).
Than BitBlt the source into the destination.

Posted 27-Jun-10 6:56am

Emilio Garavaglia

Solution 3

yeah.. i've same problem...
anyone give some help for the source code in c++ please...?

Posted 2-Aug-10 14:00pm

dika_kyanti

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Christian Graus 2-Aug-10 20:04pm

You've been given explicit instructions. If you can't work it out from there, buy a book and read it, so that you can understand the answer given, or post your code and ask a specific question instead of asking to be spoon fed.

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Richard MacCutchan · Accepted Answer · 2010-06-27T00:38:00

Solution 1

I guess you create a new 1-bit bitmap and then add black or white pixels for every position that corresponds to some colour or shade in the original.

Posted 27-Jun-10 0:38am

Richard MacCutchan