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microsoft.public.dotnet.framework.drawing

Modify jpg but leave quality the same

shelby_marsden

1/8/2005 6:32:00 PM

Is it possible to write a program that will modify a jpg, say adding
some lines or text to it, and then save it leaving quality and
compression the same? Ideally in such a way that you could run the
program multiple times with no degradation in quality? I know that
there are some transforms (like rotate) that can be performed in a
repeatable way as long as the bitmap dimensions are multiples of 16,
but is it possible to do arbitrary transformations in a
non-destructive way? If not, what is the best way to minimize
degradation?

TIA
1 Answer

Bob Powell

1/9/2005 2:04:00 PM

0

The trouble with jpeg is that the compression is lossy so unless you save at
100% quality you'll always get degradation and eventual loss of quality.

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Bob Powell [MVP]
Visual C#, System.Drawing

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"Sven Holmblad" <shelby_marsden@hotmail.com> wrote in message
news:2d5465c3.0501081031.7eb96d1@posting.google.com...
> Is it possible to write a program that will modify a jpg, say adding
> some lines or text to it, and then save it leaving quality and
> compression the same? Ideally in such a way that you could run the
> program multiple times with no degradation in quality? I know that
> there are some transforms (like rotate) that can be performed in a
> repeatable way as long as the bitmap dimensions are multiples of 16,
> but is it possible to do arbitrary transformations in a
> non-destructive way? If not, what is the best way to minimize
> degradation?
>
> TIA