How do I find the DPI resolution of an image?
Finding the DPI resolution of an image is straightforward when you use Adobe Photoshop. Photoshop measures resolution in PPI, but its ratio of PPI to DPI is 1:1, so you can still find out what the DPI of an image is.
Just follow these simple steps:
- Launch Photoshop on your laptop or computer.
- Navigate to File > Open and select your image.
- With your image open, click Image > Image Size.
- Select Pixels/Inch in the drop-down box besides Resolution. This will give you the resolution value.
How to find the DPI resolution in InDesign.
You can also find the DPI resolution of an image using Adobe InDesign. InDesign is professional page design software, perfect for editing and designing posters, magazines, prints and banners.
InDesign uses two terms to refer to resolution — Actual PPI and Effective PPI.
Actual PPI is the resolution of the image while at 100% of its original size, meaning when the image is at its original dimensions without being resized.
When you enlarge an image, the existing pixels are stretched to accommodate the new size. This is where Effective PPI comes in. This refers to the resolution of the image based on how it is placed on the InDesign page — showing how the final product would look if it was enlarged or reduced in size.
So, for instance, if you wanted to print an image at 300 DPI, you would need to make sure the image has an Effective PPI of 300.
Here are step-by-step instructions of how to do this on InDesign:
- Launch InDesign on your laptop or computer.
- Navigate to File > New > Document and select OK when you are happy with the page dimensions.
- To insert an image, select File > Place, then choose your image file by clicking Open.
- Click to place the image anywhere on the document.
- To find the resolution, navigate to the top bar and select Window > Links.
- This box will give you your image Dimensions, Actual PPI and Effective PPI. If you can’t see this information, expand the box using the Show/Hide triangle (>) to drop it down.