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Date Posted: 07:12:38 03/31/03 Mon
Author: Michel
Subject: Re: BMP or JPG and BytesSaved
In reply to: eric kundl 's message, "BMP or JPG and BytesSaved" on 18:16:58 03/28/03 Fri


Hi Eric,

You are correct. When displaying an image on screen, the memory consumption in your program is based on the image size, and the type (ie, bw, palette, true color, etc...) and not the format on disk.

Definitely, on disk or blob, jpg will be smaller them bmp especially for colour images. Note that with JPG there is a small quality loss everytime you save the image (this is to improve compression). If you image is only saved once, this is ok, but if the image is to be saved more than once, I would use png format.

Best regards,

Michel

>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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