Image Size
The size of an uncompressed raster image I = w · h · i from dimensions and color depth or palette size; colors for a given size.
What to find:
The image is stored without compression: each pixel takes i bits. True Color is 24 bits (16.7 million colors), High Color 16 bits.
The image size calculator finds the size of an uncompressed raster image from its dimensions and color depth or palette size, and the maximum number of colors for a file of a given size.
Formulas
I = w · h · i, N = 2i
w and h are the width and height in pixels, i is the color depth (bits per pixel), N is the number of colors in the palette.
| Color depth | Colors |
|---|---|
| 1 bit | 2 (black and white) |
| 8 bits | 256 |
| 16 bits (High Color) | 65,536 |
| 24 bits (True Color) | 16,777,216 |
Example. A 640 × 480 image with a 256-color palette: i = 8, I = 640 · 480 · 8 = 2,457,600 bits = 300 KB.
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