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Re: [OM] ( OM ) New photos - non-film, sorry

Subject: Re: [OM] ( OM ) New photos - non-film, sorry
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Mon, 02 Nov 2009 13:34:09 -0500
Thanks.  I'll keep your recipe.  I've not had to do this sort of thing 
ever but maybe the day will arrive.  I'm also not much up to 
experimentation today as I have an eye patch over one eye.

Chuck Norcutt

Ken Norton wrote:
>> Mr. Sachs was so adamant on this point that I don't think he'd agree
>> with your exceptions.  But you have the power to prove him wrong.  Can
>> you demonstrate your point using Picture Window Pro... his own product?
>>
> 
> Absolutely!
> 
> If I need to upsize an image (which is a normal requirement with 5MP E-1 and
> A1 files), and the image contains straight lines in it, you absolutely will
> get the saw-tooth pattern high-contrast edges within the image.
> 
> To break those edges up, you need to use multiple steps. But if you do the
> 10% resizing, things just look mushy and nasty.  The resulting image will
> lack the definition a single-step resizing has.  So, to reduce the pattern,
> here is my recommendation.
> 
> 1. Resize by some odd percentage like 113%.
> 2. Resize by another odd percentage like 134%
> 3. Resize by another oddball like 121%
> 
> I used Fibonacci numbers in this example which yielded an almost doubling in
> size in three steps. By doing this, the saw-tooth artifacts are nearly
> eliminated or at least reduced enough to be a non-issue most of the time.
> 
> I've also experimented with image rotation (full image--no cropping) during
> the steps.  For example:
> 1. Rotate image 13 degrees CCW (anti-clockwise)
> 2. Resize by 113%
> 3. Rotate image 34 degrees CCW
> 4. Resize by 134%
> 5. Rotate image 21 degrees CCW
> 6. Resize by 121%
> 7. Rotate image 68 degrees CW
> 8. Trim off the white edge to your original image area.
> 
> This has given simply outstanding results. Horribly time-consuming in
> Photoshop, but much faster in PWP 5.0.
> 
> Resizing is pretty much a lost art now because of higher pixel-count
> sensors. Only us dinosaurs with E-1s have to go through these things.
> 
> AG
-- 
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