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I am having a .png image but when I am wanting to upload it for printing, it gives me following message
Your image can not be stretched to fit the entire document without significantly reducing the quality of your image. Images should be created at 300 DPI for best quality.
If anyone can tell me how do I change the DPI of existing .png image to 300 DPI, it would be appreciated.
If it's a photo, you may be totally out of luck because the needed information is just not there, and I have yet to see an interpolation algorithm with results that are easy on the eye.
However, if it's a design/illustration, you may be able to do some scaling-up tricks by converting the rasterized (pixel) shapes to vector curves (paths) which are resolution independent. Then scale to the needed size, go back to pixels and tweak any rough spots.
Nothing very automated here. But with lots of hand-eye work and good judgement calls, you can sometimes get very good results.
I learned the hard way that if there's even the most remote chance a photograph might be used both for the web and for print the best thing to do is scan it at high resolution (huge) and do all my comps from there. I generally save my original scan as a .PSD and go from there. That's what big hard drives, lots of memory, and CD writers are for:) It might mean you have the same image saved at varying dpi's, various sizes, and different formats - but you'll always have the best quality available to work from that way and won't get caught flat-footed should you need to use the same image for more than one purpose.
Taking a 72 or 96dpi image, cutting and pasting into Photoshop, and bumping up the resolution seldom gives very good results on detailed photographs. I've done it a couple of times and ended up airbrushing, re-saturating color, blah blah... all the time wondering why I hadn't just "done it right" the first time. It turns into a Sisteen Chapel project you grow to dread like the plague. (ditto tedster)
Safety first. High res (photographic) scans. All of the time.
I am using Fireworks [I kinda like it]. I just clicked on "modiy" => "Canvas" => "Image Size" and in Image Size options, change the "Resolution" to whatever you want and choose pixel/cm or pixel/inches as per your preference.
It did changed the size of the viewable image on the computer screen, but when you print it, it prints in the original size.
Hope this help. :)