Why do you need such a high dpi? Rule of thumb: the dpi of an image or
object should be twice the lpi the file will be printed at.
Inkjet printer = 150 dpi
Laser printer = 175-200 dpi
Professional output = <350 dpi
While that is true with 8-bit (greyscale), 24-bit (RGB) and 32-bit
(CMYK) images - for 1-bit (b&w) images the resolution should be higher.
If practical, the ppi of the image should be the same as the dpi of the
output device - but for imagesetters (which tend to be around 2400 dpi)
a ppi of 1200 is adequate.
That being said there's no good way of adding pixels to an image without
deteriorating it - short of redrawing or tracing the image as a vector
graphic. This sort of work needs to be done in a vector drawing program
(ie Illustrator).
I heard a good metaphor today. It's like rewriting a book based on the
Readers Digest condensed version.
you do not want to let any application alter the resolution if anything. If
you need a specific resolution, it must be handled that way from the very
beginning. You cannot "add" resolution without making matters worse.
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