How do I get the color depth of a bitmap and calculate its size (in Ko) ?

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Hi here,

Let e explain what i'm trying to do. I get a snap from a camera and save it into a bitmap object but do not save it on the disk. I want to calculate the size of that bitmap (in o or Ko) and somewhere, i've found this formula :

Size (in Ko) = (Width * Height * Color Depth) / (Number of bits per pixel * 1024)

Elsewhere I've found a formula of Color Depth :

Color Depth = 2^(Number of bits per pixel)

I'm a little bit confused with all this. I would like to know if it's really possible to get the size (in Ko or whatever octects) of a bitmap without saving it before.

I've checked the System.Drawing.Imaging.PixelFormat value for the snap i've got from the camera and had 32bppArgb (I suppose if i'm understanding things that there is 32 bits per pixel in my bitmap).

Thanks.

Posted 27-Jun-14 0:37am

Olayèmi Ouabi

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OriginalGriff · Accepted Answer · 2014-06-27T00:53:00

You can get a rough estimate of the size of a bitmap:

Bytes = Width * height * (BitsPerPixel / 8)

But that won't be exact: a Bitmap file contains framing and other information (such as palettes, width and height infor) which also occupies space. A bitmap object also has other members which also use memory space.

It'll be about right for the data if you just get it as raw bytes:

C#

MemoryStream ms = new MemoryStream();
imageIn.Save(ms,System.Drawing.Imaging.ImageFormat.Bmp);
byte[] rawData =  ms.ToArray();

VB

Dim ms As New MemoryStream()
imageIn.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp)
Dim rawData As Byte() = ms.ToArray()