Please lets us know what the problem was, it may be helpful to other users of the app.
Of course, it'll just take a little calculation but sure you can do it.
The basic maths is this: (PPI = Pixels Per Inch, incorrectly called DPI)
If you want a certain Output 'print' size:
Print Size = Pixels / PPI
For a certain PPI:
PPI = Pixels / Print Size
For a certain pixel dimension (no upscaling or downscaling)
Pixels = Output Size * PPI
From that you should see that you need to know TWO of the three factors. Which calculation you use depends on which two you know, you can then work out the third.
Example 1: (Fixed Output Size AND fixed PPI)
You want to print an image 10" x 6"
You have been told that you need to print @300 PPI(dpi)
This means in order to achieve this you need to have an image of: 3000px x 1800px (10 * 300, 6 * 300)
If your image isn't those dimensions then you have to do 1 of 2 things:
If the image is smaller then you have to UPscale it. (Reduces quality)
If the image is larger you can do 1 of 2 things:
You can CROP it to remove the excess pixels (Retains quality)...OR...
You can DOWNscale it. (Reduces definition)
Example 2: (Fixed pixels AND fixed PPI)
Your image is fixed to 3000px x 1800px
The PPI is also fixed @200
Therefore the Output Size will be: 15" x 9" (3000 / 200, 1800 / 200)
For a SMALLER output size you would have to INCREASE the PPI.
Example 3: (Fixed pixels AND fixed Output Size)
Your image is fixed to 3000px x 1800px
The Output Size HAS to be 12" wide exactly.
Therefore the PPI needs to be set to 250 (3000 / 12)
If this is not enough then you'll have to either change the output size or change the pixel dimensions.
Your final output size will be:
(3000 / 250) = 12" wide.
(1800 / 250) = 7.2" high.
Example 4: (Fixed Output Size Only)
You want a print 20" x 10"
The PPI would be pixels / output size.
The pixels would be PPI * output size.
Which of those you choose depends on which one you cannot change...fixed pixels = calc PPI, fixed PPI = calc pixels.
Regards.
MrTom.
