180 or 360 ppi?

I print my fine art prints with Image Print, an excellent RIP.  And I print on an Epson 4800.  Image Print gives you the option of printing at 180 or 360 ppi.  I’ve printed a lot of great looking, rather large photographs at 180 ppi.  A lot of my friends are shocked.  They say I’m compromising the quality of the print.  But no matter how close I scrutinize the prints I really can’t see any difference.

Enter Genuine Fractals.  Genuine Fractals really objects if you try to resize an image to 180 ppi.  The smallest it is comfortable going is 240.  To get it to accept 180 ppi I have to fake it out. 

But the fact that it defaults ot 240 raises all sorts of questions.  What if I resize at 240 ppi and print at 180 or 360?  For that matter, is there a difference between 180 and 360.  So the other day I was printing some 16X24 images and decided it was time to finally ran a test. 

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