Resampling???

Posted By

Brian_Ingle

Feb 12, 2004

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309

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I running PS 7 and am having a hard time understanding if I am doing this right or not. I have a 8×12 .tif image that is 44 mb in size at 400 dpi. I want to print this image on my new Epson 9600 at a size of 24×36. When I go to image size and change the size to 24×36 the file size goes to between 400 to 700 mb depending on my dpi. However if resampling is not checked the file size stays the same. How do I need to do this? which is correct? or is there a better way. I am not very knowledgeable on understanding file size and dpi. Any help would be appreciated.

Thank You!
Brian

Scott_Falkner

Feb 12, 2004

Resampling off is correct.

LenHewitt

Feb 12, 2004

Brian,

Your original image 3200px by 4800px. Resizing without resampling will maintain those pixel dimensions, but your ppi will drop from 400 to 400/3 or 133ppi.

Now that will *probably* give you an acceptable print from the Epson, although the ppi is less than optimum.

If you resize to 24 x 36 / 200 ppi with resampling on, the pixel count will increase to 4800px by 7200px, which will result in some loss of sharpness (apply USM to ‘correct’), but a better ppi for printing.

In an ideal world you would want about 240 ppi at the final size (5760px by 8640px), but the more pixels you add by re-sampling, the more the image quality will suffer.

Gordon_Anderson

Feb 12, 2004

Len,

"If you resize to 24 x 36 / 200 ppi with resampling on, the pixel count will increase to 4800px by 7200px, which will result in some loss of sharpness (apply USM to ‘correct’), but a better ppi for printing."

It would seem that a loss of sharpness would by definition degrade the image. When you say that it would indeed be "a better ppi for printing" what then are you referring to. Thanks.

Gordon

Colin_Walls

Feb 12, 2004

Gordon

To paraphrase Len’s good advice:

You haven’t got enough pixels. You have 2 choices:

1) Print what you’ve got and see whether that’s good enough [i.e. let the printer do its best].

2) Use PS to add pixels [resample], then print.

I would do (1) first, only trying (2) if the result was totally unacceptable.

Brian_Ingle

Feb 12, 2004

Thank all of you for your help, This will get me started in the right direction.

Brian

LenHewitt

Feb 12, 2004

Gordon,

It would seem that a loss of sharpness would by definition degrade the

image<<

It will, but applying USM will correct a lot of the percieved degradation, whereas there nothing you can do about printed image degradation due to too low a ppi…..

Gordon_Anderson

Feb 13, 2004

OK. Thanks for the input Len.

Gordon

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