DPI (Dots Per Inch) and PPI (Pixels Per Inch) are exchanged at a ratio of 1:1.

Download our example image using This Link

Using Photoshop

Open your image and navigate to

**Image > Image Size**.

Set to

**Pixels/Inch**(PPI) under the section labelled

**Resolution**.

Calculations are made automatically to present the resolution in any desired format.

Using GNU Image Manipulation Program

Open the image and navigate to

**Image > Scale Image**.

Set units to

**Pixels/in**under the section labelled

**X and Y resolution**.

Using Grey Matter

The formula for calculating the pixel dimensions required for a 300 DPI artboard is as follows:

Multiply the width of your desired print size by the DPI value required (300).

Multiply the height of your desired print size by the DPI value required (300).

For example; the required print size is 8 inch wide x 10 inch high.

8(in) x 300(DPI) = 2400(px)

10(in) x 300(DPI) = 3000(px)

Our minimum required artboard size for a 300DPI image at 8 x 12 inch, is 2400 x 3000 pixels.

If you already know the image dimension of your image in Pixels; take the two numbers of the image dimensions and divide them by your desired print size.

For example, 1200px by 600px:

1200(px) / 2(in)

600(px) / 1(in)

= 600(PPI)

With a DPI of 600, we can easily double the print size to 4in x 2in and still remain within the 300 DPI recommended minimum.

To check the maximum size an image can be resized to; simply divide your artwork Pixel dimensions by 300 to get the maximum size in inches:

1200(px) / 300(DPI) = 4(in)

600(px) / 300(DPI) = 2(in)

4 x 2 inch

The dimensions in our example are 1463px x 1893px or 4.88in wide x 6.31in high.

1463(px) / 300(DPI) = 4.88(in)

1893(px) / 300(DPI) = 6.31(in)

The DPI is 300.

If we make the image any bigger; it will lose definition in relation to its scale.