KR> it depends, gifs are limited to 256 colours, whereas jpegs can be

 KR> 24 bit, so the colour resolution of the jpeg is usually better,

 KR> the spacial resolution depends on the compression ratio used, but,

 KR> as a general rule, i'd say that you can at least half the file

 KR> size without any objectionable effects.



 BG> Didn't know that BMPs were restricted to 256 colours, but then I don't

 BG> have much to do with graphics anyway.  I did note that Brenton's JPEG

 BG> pictures had good colour, but became "blocky" when
resized upwards,

 BG> although it was never really objectionable.  The smaller file more than

 BG> compensated in that case.



bmps can be 24 bit, gifs however, are limited to 8 bits. one of the

failings of jpeg is that you shouldn't resize it upward. fractal

compression is size independent, but jpeg is only intended to be

reproduced at the original size.



 KR> it does depend on the individual image though, some take jpeg

 KR> compression better than others. don't try it on line drawings or

 KR> things like corel draw pictures though, jpeg is specially designed

 KR> for photographs.



 BG> Is that why 24-bit colour is permitted with JPGs then?



because for the reproduction of continuous tone photographs, the maximal

number of colours is required.



 BG> Anyway, when (or if) Paul ever upgrades to V.34, file size will no

 BG> longer be the issue that it is at the moment (only for us

 BG> STD-types, of course).



KR> just live on the north shore of sydney, as all reasonable people do (:



 BG> Since when?  I thought the north shore only included those parts between

 BG> North Sydney and Hornsby.  Anywhere north of that, and you're out in the

 BG> bush!  :)



berowra is in the sydney metro area (it is in fact the highest point in

metro sydney) as well as being the northernmost point for suburban

trains, so i'd reckon it is the furthest point of the north shore. there

is the north shore, the upper north shore, we must the outer north

shore. it's a local call to the central coast and most of sydney metro,

and only a community call as far as brentons. even more important, its

only 20 min drive from work, and less than 2hrs to port stephens.

                        Keith



... "C++ is too complicated already" - Bjarne Stroustrup



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