Hi Res Images

So often I am given images that are unusable for print publications. I am always requesting hi-res jpgs from clients and they sometimes are confused how to get their images into a higher resolution, or what that means. They will tell me they took it off their website and the image looked great there. Sometimes that works and sometimes it doesn't.

To begin, a rule-of-thumb for a high res image is 300 ppi at a reasonable size (close to the actual printed size). PPI refers to how many pixels, or tiny digital fragments, make up one inch (pixels per inch). The more fragments or pixels the crisper the image, the less pixels, the more blurry or "pixelated" the image. To check image resolution, open image in Preview or Photoshop. In Preview go to Tools>Adjust Image Size, and check the resolution. In Photoshop go to Image>Image Size. If the resolution seems low, check the overall dimensions above. If they are very large, like 34 inches by 28 inches, you will be able to reduce the overall size and increase the ppi of your image enough to be considered high res. Conversely, if the image is 300 ppi but 1 inch by 1.5 inches, you will not be able to increase the overall size without decreasing the ppi.  If the original image does not exist in hi-res, you can't make it so by simply increasing pixels. However, if you have an even higher resolution than 300 ppi, do not despair. You have a great image that can be blown up larger, cropped in, or just look very crisp in your publication. Always save hi-res images and create a new down-sized low-res image for web applications or emails, if necessary. Use the highest res images for press printing.

TIP: If the image is less than 700 KB, it is unlikely that it is high enough res. If the image is 1MB or more, it is probably good for press. This is not always an accurate measure but if I receive 100 KB file (or smaller), I don't even bother to look at it.

This article was originally posted in April of 2010 in Dan Monge's Mac IT Pros E-Newsletter.

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