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Posted on 2004-03-22
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Hi,
   If I have a BITMAP variable , can I change the RGB pixel values directly by accessing the bmBits field?

Is there a need to use GetDIBits() to get the device independent bitmap? What are the repercussions if I do not use GetDIBits and change the pixels directly via BITMAP.bmBits?

Also, how do I get a handle to BITMAP (i.e. HBITMAP)?

Thanks a lot.
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Question by:limin123
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by:chensu
ID: 10659898
>If I have a BITMAP variable , can I change the RGB pixel values directly by accessing the bmBits field?

Yes, you can. But it is a DDB. Each device has a unique color format. You will have to know the color format of your device and you can't transfer it to other devices.

>Also, how do I get a handle to BITMAP (i.e. HBITMAP)?

No way. But you should know the HBITMAP. Otherwise, how do you get the BITMAP?
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by:limin123
ID: 10663977
So if I am doing image processing, am I better off using the DIB bits since this is a closer representation of what will be stored as a device independent bmp file?

If I am capturing frames from a web cam, will it return the bits as DIB or DDB?

Thanks a lot.

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chensu earned 400 total points
ID: 10664574
>So if I am doing image processing, am I better off using the DIB bits since this is a closer representation of what will be stored as a device independent bmp file?

Yes, what are stored in a bmp file are DIB bits.

>If I am capturing frames from a web cam, will it return the bits as DIB or DDB?

It should give you DIB if it is across the network.
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