Re: Large print - quality issue

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Meh doesn't need to work like that at all.  Doubling to get to the close and then the final % would probably work just as well or better and I still doubt with modern scaling algorithms that it would actually matter.   Mathematically doubling or even 4x scaling makes a lot more since since you aren't having to do any sub pixel interpolation.  I would still bet if you just scaled and did any of these other methods and then did a difference the difference is so minute.   I was going to put a feature in xRes when I was working at macromedia that did all types of different math types and it just wasn't worth the very minimal difference.  

Randy S. Little
http://www.rslittle.com/
http://www.imdb.com/name/nm2325729/




On Sat, Aug 23, 2014 at 6:55 PM, Eichhorn, Roger <eichhorn@xxxxxxxxxxxxxx> wrote:
Scott Kelby, in one of his early photoshop books, suggested that one could blow up photos by a few percentage points at a time.  I tried it with a jpeg file and it worked.  For example, increasing the size by 5 percent fifteen times will approximately double the size of the image (2.08.)  I don't l know if it will work for you, but it might be worth trying.  You can solve the equation (1.0x)^n = y, for n, where x is the percentage increase for each iteration, y is the final size and n is the number of iterations.

Roger

Sent from my iPad

> On Aug 22, 2014, at 8:05 PM, "James Schenken" <jds@xxxxxxxxxxxxxxx> wrote:
>
> Oops, I calculated at 3000 pixels on the long dimension rather than 4000.
> Please make adjustments accordingly.
> Sorry about that.
>
> CPAP Therapy is a way to live.
>
>> On Aug 22, 2014, at 8:44 PM, James Schenken <jds@xxxxxxxxxxxxxxx> wrote:
>>
>> The problem appears to be that the image magnification is about 44 times.
>> The image resolution is about 83 pixels per millimeter.
>> So, what you get if everything is perfect is 2 pixels per millimeter or about 50 dpi.
>> That's OK if everyone is going to be 15 feet away from the image or so.
>>
>> Any chance the museum would go for a black and white half tone for a background?
>>
>> CPAP Therapy is a way to live.
>>
>



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