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Re: Image formats

Subject: Re: Image formats
From: Stan Schwartz <stanz -at- cam -dot- org>
To: "TECHWR-L" <techwr-l -at- lists -dot- raycomm -dot- com>
Date: Mon, 8 Apr 2002 12:51:16 -0400


At 5:08 AM -0700 4/8/02, Alfred P M wrote:

For example, lets say you have a 100 Kb GIF file. What I am looking for is the equivalent file size in PNG and JPEG of the same file when converted?

You have asked a question that cannot be answered quantitatively without considering the characteristics of the original pictorial subject.

If the amount of detail is a factor, the choice of the format will change the size of the file.
If the amount (gamut) of colour is a factor, the choice of the format will change the size of the file in a different way.

JPEG is an _image_ compression technology while GIF and PNG are _data_ compression technologies.
JPEG is lossy (looses data) and GIF and PNG are lossless.

Can you ask the question in a different way? Best,
s

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References:
Image formats: From: Alfred P M

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