Archived posting to the Leica Users Group, 2006/04/10

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Subject: [Leica] Daffodils/BW from Colour
From: douglas.sharp at gmx.de (Douglas Sharp)
Date: Mon Apr 10 15:59:06 2006
References: <D91E41DE73300E4191E031B18D09FA88E7975C@mtv-amer002e--3.americas.sgi.com><003b01c65bf0$d397fdf0$6101a8c0@jimnichols><004201c65bf2$9484eb30$6101a8c0@jimnichols> <DFB0C695-DF17-44E9-8C6C-856F28DE6B57@pandora.be><005101c65bf5$07183560$6101a8c0@jimnichols> <44394620.7090402@gmx.de> <000401c65c20$8783aba0$6101a8c0@jimnichols> <44398F81.1060603@gmx.de> <cfml321ujsh4igb1kt6kfgefldhqb843as@4ax.com>

Hello Eric
For one thing it only sharpens the higher frequency portion of the 
spectrum - this means you have a better chance of avoiding low and 
mid-frequency aliasing or artefacts.
The second advantage is a preview function which shows the effect of 
sharpening as a function of sharpening strength - you have to see it to 
get the idea. this is a grey scale display which shows the edges of the 
image being sharpened - this is an excellent QC tool for avoiding the 
luminous edges often caused by oversharpening. It's not quite as much of 
a black-box as unsharp mask
The third is the extreme sensitivity - the sharpening really snaps, and 
is controlled  by only 2 sliders.
In addition it's very effective, fast and it's free.
Douglas
I'll have to get around to making a little gallery showing and comparing 
freeware/shareware/cheapware/ and can't-be-done-without-ware one of 
these days :-)
There's some clever stuff around, and it's not all expensive.

Eric wrote:

>Douglas:
>
>  
>
>>By the way, some 
>>of the other stuff on the site is very interesting too, particularly the 
>>high frequency sharpening plug-in.
>>    
>>
>
>How is it different from the regular unsharp filter in Photoshop?
>
>
>
>--
>Eric
>http://canid.com/
>
>_______________________________________________
>Leica Users Group.
>See http://leica-users.org/mailman/listinfo/lug for more information
>
>
>  
>

Replies: Reply from jgovindaraj at eth.net (Jayanand Govindaraj) ([Leica] Daffodils/BW from Colour)
In reply to: Message from bquinn at sgi.com (Bernard Quinn) ([Leica] Daffodils)
Message from jhnichols at bellsouth.net (Jim Nichols) ([Leica] Daffodils)
Message from jhnichols at bellsouth.net (Jim Nichols) ([Leica] Daffodils)
Message from philippe.orlent at pandora.be (Philippe Orlent) ([Leica] Daffodils)
Message from jhnichols at bellsouth.net (Jim Nichols) ([Leica] Daffodils)
Message from douglas.sharp at gmx.de (Douglas Sharp) ([Leica] Daffodils/BW from Colour)
Message from jhnichols at bellsouth.net (Jim Nichols) ([Leica] Daffodils/BW from Colour)
Message from douglas.sharp at gmx.de (Douglas Sharp) ([Leica] Daffodils/BW from Colour)
Message from ericm at pobox.com (Eric) ([Leica] Daffodils/BW from Colour)