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Re: [OM] ( OM ) Resolving power of lenses

Subject: Re: [OM] ( OM ) Resolving power of lenses
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Sat, 17 Jan 2009 15:53:53 -0500
Yes, FastStone is free although they'd like it if you sent them a little 
donation.  <http://www.faststone.org/FSViewerDetail.htm>

I've given FastStone to my kids since it's a good browser and has more 
editing function than they're ever likely to use.  I'd probably use it 
myself if I didn't already own BreezeBrowser (not free) or Adobe Bridge. 
  Unlike BreezeBrowser and Bridge, FastStone does offer some minimal 
editing capabilities.  Like BreezeBrowser and Bridge, however, FastStone 
will also pass an image to an external editor if you want some more 
editing power.  A fairly recent addition is image comparison for 2-4 
images which I consider important.  I use it all the time in BreezeBrowser.

Sharpening rule of thumb:  To make a print, crop and resize an image to 
the desired size and resolution.  eg; 8x10" at 300 ppi.  Display the 
cropped and resized image on screen at 25-35% full pixel size.  Then 
sharpen until the screen image looks *slightly* oversharpened. The 
25-30% size on screen compensates for the differing pixel densitites on 
screen and paper.  When printed, the slight crunchiness of the 
oversharpened image will disappear as ink absorption by the paper tends 
to soften the image.

If you'd like to be a bit more precise on the 25-35% size rule of thumb 
on screen divide the screen resolution of your monitor (mine is approx. 
90 ppi) by the print resolution.  I normally print at 300 ppi.  So, 
90/300 = 0.3 or 30%   If I was printing at 250 ppi I should view at 36%. 
  But it's a rule of thumb and not critical.

This rule of thumb is one of my major takeaways from reading "Image 
Sharpening Using Adobe PhotoShop CS2" by Bruce Fraser.

Chuck Norcutt


castanet.xiosnetworks wrote:
> Wow! I finally found SOMEONE on this List who has used Irfanview!
> I do agree that Sharpening with IFW is a delicate issue and I usually only
> apply it one step if not two and that's about it. If I go beyond that, the
> image will break out like rupturing pimples. Otherwise IFW is really pretty
> much all I need. The tools are simple enough but effective for what I need.
> Like you, I don't dabble with layering and I'm utterly lost with Photoshop.
> 
> IFW is also great for oldies like me who are used to keyboard hotkey
> controls. They're fast and highly usable.
> 
> I haven't used Faststone but would like to hear more about it. Is it freely
> downloadable like IFW?
> 
> K.
> 
> 2009/1/17 <bj@xxxxxxxxxxxxxxx>
> 
>> Hi,
>>
>> Resolving power. Have I got that right?
>>
>> Recently on my E-1 I have been using a Zuiko macro 50/3.5, and also
>> sometimes the DZ 14-54.
>>
>> This may seem heretical to say, but I find that Faststone enables me to do
>> all I usually need do do to images.
>>
>> With Faststone, the DZ 14-54 images usually need sharpening by 4 or
>> maybe 5 Faststone units, to get the maximum amount of acceptable
>> sharpening absorbed by them. Zuiko 50/3.5 images, in the other hand,
>> seem to benefit only a little from Faststone sharpening, and when they do
>> it
>> is by the application of only 1 - 2 units..  I have sometimes found that
>> Irfanview sharpening goes too far and I appreciate the choice of degree the
>> Faststone provides.
>>
>> With Faststone, I usually apply some Gamma adjustment ( usually
>> lightening), and sometimes adjust contrast, saturation, and (especially
>> with
>> blue flowers) I tweak the colour levels (in this case increase the blue).
>> Moderation is the key to a good result. Then I sharpen the images before
>> saving.
>>
>> I've never got my head around layers, masking and what-not with Photoshop
>> (even though my computer came with it installed), and seem to get
>> acceptable images without these.  The KISS (Keep It Simple, Stupid ! )
>> edict
>> seems to work for me.
>>
>> Brian Swale.
>> --
>> _________________________________________________________________
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>> Archives: http://lists.thomasclausen.net/mailman/private/olympus/
>> Themed Olympus Photo Exhibition: http://www.tope.nl/
>>
>>
> 
> 
-- 
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