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Message-ID: <002901c71cb5$89e82820$0300a8c0@lark>
From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <3f5.12571ae4.32ade2fe@aol.com>
Date: Sun, 10 Dec 2006 23:30:16 -0000
MIME-Version: 1.0
Subject: LF: Re: Grabber image format
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Status: O

Hi Markus, the png file picture displays fine here too. Using IE 6 with
Win98SE. I dont remember putting anything special in for pngs but I do have
Irfanview loaded somewhere as well.

Best Wishes de Alan G3NYK

----- Original Message -----
From: <MarkusVester@aol.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: 10 December 2006 22:23
Subject: LF: Grabber image format


> Dear LF Group,
>
> today I have changed the 8-bit image format for my grabber from .gif to
.png.
> This appears to save some 20% of volume, due to a more effective lossless
> compression algorithm.
>
> When I started grabber operation I had tried various flavours of .jpg
first,
> but the halved colour resolution soon turned out inadequate for many fine
> details on the colour-DF display. With 256 colours and lossless
compression,
> resolution looked much better, but very weak signals and noise details
tended to
> get masked off by too few dark palette entries. I got around that by
brightening
> the original bitmap (gamma=1.49 in IrfanView) before reducing to 8 bits,
and
> then darkening the colour table again (gamma=0.67) before uploading.
>
> Please report if you find any difficulties displaying or downloading the
.png
> images.
>
> 73 de Markus, DF6NM
>
> http://members.aol.com/df6nm/Grabber.htm
>