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pixelbmp

What is the size of indexed image of 512*512 with 256 color values?

If I have an image of resolutin of 512 * 512,
and this image is indexed with 256 color values,
how to calulate the size of the image (file size ) ?

Solution

  • The image itself can be calculate as follow

    256 can be stored in one byte. So one pixel is 1 byte.

    You have a 512*512 pixels.

    512*512*1 = 262144 But on your disk, it will take a little more than those 262ko, as you have to count the bytes used for the file meta-information, and the color palette.

    Check out the bmp header spec if you need more informations.