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Date Posted: 06:44:56 12/06/01 Thu
Author: Michel
Subject: Re: Internal Image Structure
In reply to: Chris E. Haelg 's message, "Internal Image Structure" on 06:06:51 12/06/01 Thu


Hi Chris,

From 0.5 to 0.1 is very strange with BMP. BMP are generally non compressed and Envision does not compress with RLE, so the size should not change. Are you using some external compression when storing in your database?

Also, this could be normal with JPG, because every time you save a JPG, it is compressed again, losing some information details.

Best regards,

Michel

>We store images in a database. When reading the image
>from disk, putting into the database (using
>ImageScrollbox.WriteToStream) and retrieving it
>afterwards (using ImageScrollbox.ReadFromStream),
>image size (i.e. the bytes read from the database) has
>changed as opposed to the original image on disk.
>Example: A .bmp file on disk uses 0.5MB. It is stored
>into the database. Upon retrieving from the database,
>only 0.1MB are read.
>For compatibility reasons (accessing the image in the
>database with other tools), it would be interesting to
>know the internal structure of the image in the
>database.

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