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Often times, pictures from our digital cameras are very large. This is because there are different image resolutions for printing photos vs. simply viewing photos on the web.
Image size for printing is determined by how many pixels-per-inch (ppi) make up a photo or image. The amount of pixels (or dots) can range from a lot (300 ppi) to a little (72 ppi). When you are printing a photograph from your camera, the rule of thumb is to use the highest ppi possible for the size you need. Most printers will recommend using 300 ppi as your setting.
The web works a little differently. To understand how image ppi affects images displayed on webpages, consider this formula: 1-1.
Rather, they are based on how many pixels the image has. The goal is to resize your photo to exactly what size you will be using it on the website. A general rule of thumb is that about 100 pixels = approximately 1 inch on a website. By sizing down your photos appropriately for what you are using them for, you will reduce the file size and make the page load faster.
We recommend the setting of 72 ppi for the web. Why? Because you have to put something in the box in most image editing programs, such as Adobe Photoshop. But when Photoshop asks for ppi in the Image Size dialog, this value is used to determine how Photoshop converts the pixel dimensions of the image into printed inches.
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