chek every pixel of an image

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Hi!
i want to create an app in c# windows which takes every pixel of an image(black and white) check that pixel if pixel is white,delete it if the pixel is black then leave at the end it saves the image as a bitmap. how is it possible?
Thanks

Posted 11-Feb-12 18:30pm

saifullahiit

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Sergey Alexandrovich Kryukov 12-Feb-12 0:32am

What is the question? Is it possible or not? The answer is "Yes, of course".
Is the case closed?
--SA

saifullahiit 12-Feb-12 0:36am

i want to know how is it possible

Sergey Alexandrovich Kryukov 12-Feb-12 0:32am

By the way, you did not tell us what library do you use. System.Drawing? WPF? Anything else?
--SA

saifullahiit 12-Feb-12 0:36am

system.drawing

Sergey Alexandrovich Kryukov 12-Feb-12 0:33am

What is "delete pixel"? :-)
--SA

saifullahiit 12-Feb-12 0:37am

it checks the color of pixel if pixel color is white delete that pixel.

Sergey Alexandrovich Kryukov 12-Feb-12 1:22am

OK, thank you, you answered all my questions except one, I'm ready to answer now, but please tel me that does mean "delete this pixel". Pixel is not a file to delete. Do you mean make it certain color, or transparent, or what?
--SA

saifullahiit 12-Feb-12 1:27am

if it cannot b deleted it it should b transparent.

Sergey Alexandrovich Kryukov 12-Feb-12 1:38am

OK, it is supported with appropriate pixel format and PNG format.
Please see my answer.

"If it cannot be deleted" is not about possibility. You just did not define the whole notion of "deletion". You don't seem to be able to explain what did you mean. This is not a file or a character in text stream.

--SA

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Sergey Alexandrovich Kryukov · Accepted Answer · 2012-02-11T19:35:00

First of all, don't use GetPixel or SetPixel. This would be prohibitively slow, unless you want to retouch just a few pixels.

You need to use one of the System.Drawing.Bitmap.LockBits methods, please see:
http://msdn.microsoft.com/en-us/library/system.drawing.bitmap.lockbits.aspx[^],
see the code sample here: http://msdn.microsoft.com/en-us/library/5ey6h79d.aspx[^].

What you do is: get raw byte representation of bitmap data and modify the bytes directly. The layout of the bytes and bits in this data and interpretation of the data in the bit color and (transparency, it it is applicable) depends on pixel format; please see System.Drawing.Imaging.PixelFormat, http://msdn.microsoft.com/en-us/library/3z132tat.aspx[^].

You can save the bitmap using one of the System.Drawing.Bitmap.Save methods.

This is a pretty good short article explaining how it works: http://www.bobpowell.net/lockingbits.htm[^].

Please see my comments to the question about "delete pixel"; there is no such thing. You can only modify pixel properties such as color and transparency where transparency is supported by the pixel format you use.

—SA