Re: How to draw into a jpeg image

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#474

From: Giuliano
Date: Thu, 03 Jun 2004 09:25

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On Thu, 3 Jun 2004 02:06:01 -0700, "Remy Lebeau \(TeamB\)"
<gambit47.no.spam@no.spam.yahoo.com> wrote:

>What do you think is happening when you assign a BMP to a JPG?  It encodes
>it.  You assign a bitmap to a JPG, you lose a little.  Then you decode the
>reduced JPG to a bitmap and then encode it back to a JPG, thus losing a
>little again.  See the pattern?

...moreover because, AFAIK, you can't modify the JPEG directly in TImage, yuo
have to pass for a DIB then converting it into a JPEG again if you want a JPEG
back. So this operation is lossy.
Again, the GDI is not capable to display a JPEG directly becuase it should
need to convert the JPEG into a DIB (or DDB) before to display it. So, in the
VCL layer, the conversion from JPG to DIB od DDB has to happen, wich is
loseless beacuse it's a decoding.

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From: gcardinali@remove_adhoc.net (Giuliano)
Newsgroups: borland.public.cppbuilder.multimedia
Subject: Re: How to draw into a jpeg image
Date: Thu, 03 Jun 2004 09:25:33 GMT
Message-ID: <40bfecf8.149514656@newsgroups.borland.com>
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