Increasing resolution of bmp file

Question

Hi,
I have a bmp file to be printed, and would need to increase the resolution of the bmp from 72 dpi to 1270 dpi
for that purpose. Can this be done in photoshop? And how can it be done?
Would appreciate any inputs on this.
Many thanks.

Answer 1

Hi Mmyyl,
This is called "upsampling" and you can change the resolution by going to Image > Image Size and then changing the resolution. You should also change the resample mode to Bicubic Smoother.
It's important to note that simply typing in "1270" to the resolution area isn't going to get you very far. You'll end up with a extremely pixelated image. Follow the link below to a great article all about resizing images:
http://layersmagazine.com/photoshop-resizing-images.html
Here is a quote from the website:
The (dark) art of upsampling
That being said, (lowers voice  to a whisper) there is a very special technique for squeezing pixels into an  image without losing too much quality, but one should only use it in the direst  of deadline or Extreme Large Format Printing (i.e., billboard) situations. The  trick is to pop open the Image Size dialog, leave Resample Image checked and choose Bicubic Smoother from the pop-up menu to its right. Next, change the  document dimension pop-ups to Percent and enter anywhere from 105–110%, then  click OK. Do this as many times as necessary until you get the desired pixel  dimensions. This will indeed add pixels to the image with surprisingly little  quality loss, and at super large sizes, no noticeable quality loss at all. With  such power comes the need for great restraint, however, so do resist the urge  to increase more than 5–10% at a time."
Good luck!