NO INTERSTING
----- Original Message -----
From: Walter Prins
To: [email protected]
Sent: Wednesday, March 16, 2005 5:11 PM
Subject: Re: [list] [delphi-en] Compressing a graphic before inserting it to
an Access db
----- Original Message ----- > I have an application that stores Jpeg's to
an
> Access db. If the jpeg is fairly small, then the db
> size does not grow very fast. However, I have started
> using a 3.2 Mega pixel camera. Even after cropping the
> image, the file is still pretty big.
>
> I am using imgImage.Picture.Graphic.SaveToStream to
> save to a TMemoryStream and then using
> ADOCommand.Parameters.ParamByName('Image').LoadFromStream(ms,
> ftBlob) to save it to the db.
>
> Is there any way I can compress the data, either in
> the jpeg or in the memory stream before it is saved to
> the db?
Just some observations: A JPeg picture is already compressed (as you no
doubt already know) using lossy compression mechanisms no less. This
however means that applying another compression routine (especially a
conventional lossless one) is not likely to yield any significant further
size reduction. The only way to make JPeg's smaller IMO is to reduce the
quality factor to a reasonable level without of course reducing it too much,
when creating them (or find a better image format. ;-) ) This can
sometimes decrease size requirements dramatically without significantly
affecting visual quality.
Cheers
Walter
.
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