Checking Image Size For InDesign Print

Question

I am working on a print document in InDesign. I have been sent an image and when I check the resolution in Windows by right clicking then going to details, the resolution states 300dpi. When I open the image in Photoshop and click on Image and Image Size, resolution says 72pixels/inch. Which is correct? What am I missing here? Am I not understanding something?

See screenshot attached.

In addition, when I place the image in InDesign and check the links, actual ppi is 300 and effective ppi is 414.

Could I please get some clarity on this?

Thank you in advance.

Lukas Engqvist · Accepted Answer

The photoshop file is giving you the size as pixels. When windows/photoshop does not know the dimensions of the image it dafaults to 72ppi since this is a practical size where 1px = 1pt. In photoshop you are asking the file to be converted/resampled to 72ppi, uncheck the Resample if you want to keep the original resolution. Never trust windows to make an estimation of PPI. 6300 pixels will print at 21 inches at 300ppi if you make the image 10 inches the resolution will be 630ppi. In indesign the effective resolution is the important one, it tells you at what resolution you will be printing with the current scale. 414 is OK, if you go much higher in resolution you may need to add more sharpening or risk the image appearing soft in print because the print cannot print the details in the same way that you can view them by zooming in.

rob day · Answer

For some images the resolution and output dimension metadata can be missing–it depends on the source of the image and its format. If the resolution info doesn’t exist, InDesign will default to 72ppi without changing the image’s pixel dimensions—the output width dimension at 100% will be (width in pixels)/72. Scaling down the 72ppi image to 24% will increase its output resolution to 300ppi

In Photoshop if you uncheck resample, set the resolution to 300ppi, and resave the image as Photoshop Format, the image’s output dimensions and actual resolution will be honored by InDesign. Photoshop’s Save For Web JPEG format will not include the output dimension info and will also default to 72ppi

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