Compression Ratio calculation

Asked Jan 18 '13 at 05:15

Active Jan 18 '13 at 05:41

Viewed 2,808 times

I am doing image compression but I am finding hard time caclulating the compression ratio of the decoded image.

I thought it was calculated as

CR = Size of decoded image/ size of original image

but am being told it is wrong.

Can someone please correct me on this.

And for the bit/pixel, is it also calculated as;

bpp= 8/CR ??

Please guide me.

edited Jan 18 '13 at 05:41

Uttara

asked Jan 18 '13 at 05:15

Muk

1

I have seen the compression ration in other fields as: `Bytes used to store compressed file/bytes used to store original file`, optionally multiplied by 100%. Bit/ pixel would easily be calculated as `total number of bits/total number of pixels`. – Dennis Jaheruddin Jan 18 '13 at 14:05
yeah bytes is the size of the image so how would you calculate the compression ratio using the bit allocation? – Muk Jan 20 '13 at 02:06

0 Answers0