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Date Posted: 17:31:16 02/05/03 Wed
Author: Michel
Subject: Re: regarding compression
In reply to: lakshmi 's message, "regarding compression" on 00:20:53 02/04/03 Tue


I an not a compression expert, but jpeg does not use wavelets, it uses something called dct, discreet cosine tranform if I remember correctly.

Everytime you save as a jpeg you lose image quality, hence the reduction in size even if you later save as another format.

Hope this helps,


>hello i have a doubt regarding compression of image
>files as iam doing a project in image compression .
>when jpeg files are saved i know they follow wavelet
>compression .
>the question is "i started with a jpeg file of size
>680 kb and saved the jpeg files as bmp, again the same
>bmp file i saved as jpeg the size of the new jpeg file
>was 68 kb " this process itself achieves some amount
>of compression .can you tell me what is the internal
>storage techniques of jpeg and other formats in detail

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