Problem with Resolution/DPI

A couple of scripted solutions here for Photoshop or Bridge:

I've been working on a book that includes many pictures. I set my images up in Photoshp with a resolution of 300 pixels/inch. That correlates with 300 dpi, right?

By @Geobop

I keep having to resurrect this very old (24 years old) article but heck, it still applies today, decades after it was first written as nothing has changed:

http://digitaldog.net/files/Resolution.pdf

Work in pixels.

The ppi number determines the print size, given the number of pixels you have in the file.

Ppi is probably the most misunderstood concept in all of digital imaging. But it's really simple. It means exactly what it says: pixels per inch. There's no hidden meaning.

Hi @Geobop, You write, “Most of my images are 1,000 pixels wide.” As you've been advised already, this size could be too small for printing if the images are only 72 dpi. Do you know where the original images are? Were they taken with a professional digital camera? Are they scans of prints? From a third-party (i.e., online) source? If you can get back to the original files to see if they are larger, that would be the best solution. However, if the 1,000 pixels wide, 72 ppi images are all you have to work with, enlarging the images will take some careful consideration. Also, be aware you will lose quality (some data will be lost) every time you save images as JPGs.

Open your images in Photoshop and bring up the Image Size dialogue box. Look at the size, both in pixels and in inches. Figure out how large the images need to be on the pages in your book. Then, size them accordingly, making sure they are 300 Pixels/Inch. As an example, I could print this image at 100 percent up to 6x5 inches. Make sense?

If you have 1000px wide images that means that images can print as 3,3 inch wide at resolution 300ppi. Is that enough? 500 pixels printed on paper with print resolution 300 means image will be printed at 1,7 inch phisycal size, is that enough? If not then you must enlarge existing images what will result with quality loss or look for original images and crop them according to final destination needs.

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@Geobop wrote:

I set my images up in Photoshp with a resolution of 300 pixels/inch. That correlates with 300 dpi, right?

Pixels Per Inch is actually PPI, not Dots (of ink) Per Inch which is ink on paper.

• Can you tell us the width and height of your image in pixels? Is 6000 px x 6000 px or 500 px x 500 px, for example?
• What is the file format — PSD? TIFF? JPEG?
• How are you saving the image?
• Are you working on a copy or the original?

Jane