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There is another significant difference between the GIF and JPG
formats. GIF is a loss-less compression format while JPG introduces
distortions into the image.
At higher JPG compression settings bigger distortions are introduced.
For photographic images the distortion is usually acceptable. However
for MS charts, high compression JPGs can easily obscure the exact
point at which an indicator crosses a signal line. Yet another reason
to use the GIF format for MS Charts whenever possible.
Chip
---Jack Velte wrote:
>
> this is slightly misleading. while i completely agree with the bmp
and pcx
> formats -- as they are not a format that compresses the data, both
the gif
> and jpeg (jpg) format compress the data. there is a *choice* when
> compressing using Jpeg about how much to compress. i guess the
default is
> pretty implementation dependant. so these results are true for this
image
> and this compression ratio, but "your mileage may vary!" [for
photographs
> and images with gradual color transitions, jpeg usually compresses
much
> better than gif. for images like charts with only abrupt color
transitions,
> perhaps gif is always better.]
>
> -jack
>
>
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