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Date Posted: 18:16:58 03/28/03 Fri
Author: eric kundl
Subject: BMP or JPG and BytesSaved

D5, Envision 2, XPhome

i have an app that scans magazine sized pages and then saves them in a Blob field in a database. they are not saved directly to a file, just put into a table in a FlashFiler database.

i know that .BMP files take up a lot more space than the same image as a .JPG file, however when i created 2 identical test apps that do nothing but scan and then display in a TImage, one using EnJpgGr and one using EnBmPGr, the actual memory consumed by the 2 apps is nearly identical.

is this because a graphic in memory is the same size no matter whether I use EnBmpGr or EnJpgGr?

To save disk space in the Database, should i scan using EnJpgGr and when the Graphic is saved in the database it will then take up less room than if i use EnBmpGr?
or is it not going to make any difference? in other words, when does the Jpg compression happen? only if i save to a image.jpg file?

thanks... eric

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