Hi Markus ,
Good no problem !
73 qro Jean-Pierre f1afj
----- Original Message -----
*From:* [email protected] <mailto:[email protected]>
*To:* [email protected]
<mailto:[email protected]>
*Sent:* Sunday, December 10, 2006 11:23 PM
*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
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