[Ham-Computers] Still Need Help

Fri, 14 Nov 2003 14:47:00 -0500

What might be most helpful to many list subscribers, is for one of you photo
and/or scanner wizards to explain what type of image (.bmp, .gif, .jpg etc)
should be used for what and when, when to use compression - how much to use -
when not to use it at all, the right resolution setting - 300 pi, 150 pi, 75 pi
etc. 	

Duane W8DBF	

----------
From: Michael Neverdosky <[email protected]>
To: [email protected]
Subject: Re: [Ham-Computers] Still Need Help
Date: Friday, November 14, 2003 1:56 PM

"Duane Fischer, W8DBF" wrote:
> 
> I then changed it from .bmp to .jpg, lowered the compression down to 90% and
> saved the image.
> 
> When a friend viewed it there were some black smudges in text areas, black
> typewriter ink text on a white background. 

> This smudge, or whatever it is, occurs only in text areas. The colors of the
> card are fine and clear.
> 

The smudge is an artifact of .jpg compression.
For line art or text you want to use .gif if you need a compressed
format.
.jpg is great for photo realistic scans but can't handle very high
contrast
transitions like black text on white background.

Use gif.

michael N6CHV
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