Resolution

Allows you to check the resolution of the images in the document against a speficic threshold.

Images with a low resolution may print badly. The optimal resolution depends on the output device, i.e. for on-screen viewing a low resolution will suffice, but for professional printing, you need a high resolution.

Images with a very high resolution result in drastically increased file sizes.

For more information, refer to Image resolution.

Note that you can restrict this check to:

Either all pages or only single or non-single image pages
1-bit images (black and white images) or color or grayscale images
Images below/above/equal to a particular threshold

Optionally, you can ignore very small images (of a specific size).

Possible fixes

You can downsample the detected images to the preferred resolution, using the resampling method of your choice. For more information, refer to Resampling (downsampling) explained.