On Jun 10, 11:14 pm, "Sitara Lal"
wrote:
I am working with a CMYK image where the original resolution is 72dpi. Is it possible to ‘upsample’ it to 300dpi (for printing purposes) by saving it at the higher resolution, or is that a pointless exercise (other than to give me a much larger file size)?
It *is* possible, but don’t expect miracles, if your starting image is really poor.. upsampling is kind of an art form, and to do it right takes a bit of time. Most pros recommend upsampling a little at a time, and performing custom sharpening procedures at each level. You have to be very careful though, because it’s easy to over-sharpen when you use this method.
If there is any retouching to be done, it’s best to do it before you upsample, since afterwards your image may be extremely large, depending on what you plan to do with it. There’s no rule against doing it after you up-rez, but I try to do as much as I can beforehand.
A quick search for photoshop upsizing should get you started. There are also 3rd party programs/plugins out there built specifically for this purpose.. Genuine Fractals and PhotoZoom Pro spring immediately to mind, but there are others as well.
good luck!
J