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Date Posted: 20:45:13 10/26/03 Sun
Author: Michel
Subject: Re: Get Jpeg Quality/Compression details
In reply to: Bruce BIddle 's message, "Get Jpeg Quality/Compression details" on 07:54:15 10/26/03 Sun

Hi Bruce,

As far as I know, the compression level is only used by the compressor when saving the file. The lower the quality value results in a file where more details are lost, but once the file is saved, the quality does not have any meaning. Note that if you keep loading/saving a jpeg, the quality will continualy degrade.

In your code, what you are seeing is just the default value, but it does not represent anything about the file.

Best regards,


>(Licenced user V2)
>I don't know anything about jpeg formats so forgive me
>if this is a stupid question!
>Does a jpeg file have the compression/quality
>information stored in the file? and after loading a
>jpeg from file does anyone know if it's possible to
>retrieve this from the file or graphic properties?
>I tried this but it always returns 80 for every file
>if ImageScrollBox.Graphic is TJpegGraphic
> then
>edit1.Text :=
> );
>Many thanks
>Bruce Biddle

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