S
Shel Belinkoff wrote:
I'm not interested in increasing the file size, rather, reducing it. Interpolation upwards is not what I want to do. I'm quite familiar with
USM, and have read the referenced tutorial a couple of times. It doesn't
quite address my question. I'm trying to get the best results when
reducing a file for viewing on the web. Am I misunderstanding you? Or you
me?
Shel
[Original Message] From: Jens Bladt <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Date: 11/13/2004 12:43:19 AM Subject: RE: Reducing File Size with Photoshop
That's right Shel. Provided you have chosen "New Image Data" in PS, which makes the computer calculate new pixels to put in between the original pixels - that's called interpolating, meaning that each time you increase dpi, you'll get more pixels in the image. The computer will put in a gray pixel between a white and black on, so to speak.
This is best done in steps, otherwithe the computer has to invent a lot of pixels without much to start from. I usual go like this: 72 - 150 - 300
dpi
or ppi.
Some people says that this on not at all necassary for printing - because the PRINTER will do the interpolation while resizing the image up to the print size that you have ordered. I don't agree, 'cause you then will NOT have the option to sharpen or improving the image using USM, shadow/highligt etc.
You can resize - without choosing New Image Date - and get NO real
changes
to the file. Sharpening works better, I believe, if you have a lot of
pixels
to work with: Take a look at:
http://www.luminous-landscape.com/tutorials/understanding-series/understandi
ng-usm.shtml
Remember that dpi (or ppi) in fact has nothing to do with the image dimensions. Dpi (= ppi = Pixel Per Inch) is about how you SEE it - on a screen, on a print etc. What matters is the amount of pixels that the
image
is made of.
