RE: [APML] OT: Photoshop lines per inch and Epson 1270

["Dale Ireland" <direland@drdale.com>]

Alan
I go by the rule that it takes 3 or 4 dots to adequately depict a pixel color. So printing at 1440 could depict 300 to 400 pixels
per inch. Original scan pixels not extrapolated from resizing or something. So for a 8 inch wide print you might need a 3200 pixel
wide image. This is why your average digital camera really only produces good prints up to maybe 5X7. In Photoshop you would
resize your image with the "resample" box not checked until you get to 300-400ppi. You could other ppi's and see how they look for
your particular situation but 350 is a good place to start.
Dale

> -----Original Message-----
> From: astro-photo-bounces@seds.org
> [mailto:astro-photo-bounces@seds.org]On Behalf Of aljordan@gwi.net
> Sent: Monday, September 08, 2003 8:19 AM
> To: astro-photo@seds.org
> Subject: [APML] OT: Photoshop lines per inch and Epson 1270
>
>
> Hello,
>
> After scanning and enhancement, when I run the printing resize wizard in
> Photoshop I am asked how many lines per inch I want the finished file to
> have.  I always guess at something fairly high because I have no idea of
> the maximum lpi the Epson 1270 can handle.
>
> Does anyone know what the proper lines per inch for max resolution out of
> the 1270 should be?
>
> Also, I always print at 1440 dpi, which is amazingly slow.  Do those who
> use the 1270 see differences between printing at 1440 dpi and 720 dpi for
> astrophotos?
>
> Thanks very much for any help in this issue,
>
> Alan Jordan
> http://home.gwi.net/~aljordan/astro

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