Before you start using Photoshop to edit images for layouts and print design, it’s important to know how to size them, and that requires working with image resolution. Understanding resolution allows you to take greater control over the final size of the images that you use in your designs. Scaling your finished images to the exact size and resolution necessary is the best possible way to ensure that you will always get high-quality prints of your layouts.
Pixel Logic
Every digital image that you open in Photoshop is made up of thousands, or even millions, of tiny square pixels. The closer you zoom in on an image, the more-visible these individual square pixels become onscreen. Apixel is the fundamental building block of a digital image. Each of the binary numbers that make up an image file represents the color of a single pixel. For all photographs captured by using a digital camera, this is the value recorded from a single cell on the camera’s sensor chip. Acamera’s resolution ultimately determines the maximum resolution an image can have, but for most forms of output you’ll convert it to a much lower resolution. Image resolution is determined by the number of pixels per inch (ppi for short) that an image contains. This is the measurement that tells us what each image’s print size and quality will be upon output. To ensure that the images used in your design will print well, you need to first check the current resolution and document size before placing an image in your layout and printing from an application such as InDesign or QuarkXPress.
Although the default, suggested print resolution that you should use is 300ppi, modern studies prove that an image really needs to be only 220ppi at 100% of its intended print size to produce a high-quality print. If you are creating an image to be displayed on the Web or exclusively onscreen, the image resolution should be set to 72ppi at 100% of its intended viewing size.
For example, an image that is 3˝ × 2.4˝ at a resolution of 220ppi can produce a high-quality print, but contains more pixels than is needed for web display (web images should be as small as possible so that they can download quickly into a browser). The same 3˝ × 2.4˝ image at a resolution of only 72ppi is small enough to display on the Web and to send as an email attachment, but cannot produce a high-quality print.
When photographing an image to be used in a print design, be sure to use the medium or large capture setting on your digital camera. Doing so allows enough resolution to produce a highquality print at a normal output size. Most consumer-level digital cameras save captured images at a universal resolution of 72ppi. However, at medium and large capture settings, the pixel dimensions are increased, allowing for higher-quality output. When scanning an image for print, be sure to import the image at 100%, using a minimum setting of 220ppi.
The Print Resolution Safety Rule: Higher Is Always Better
If you’re not sure how large you want to use an image in a print design project, always photograph or scan it at a higher input setting. Remember, you can always downsample to a lower resolution, but upsampling to a higher resolution will not improve print quality.
Pixel Logic
Every digital image that you open in Photoshop is made up of thousands, or even millions, of tiny square pixels. The closer you zoom in on an image, the more-visible these individual square pixels become onscreen. Apixel is the fundamental building block of a digital image. Each of the binary numbers that make up an image file represents the color of a single pixel. For all photographs captured by using a digital camera, this is the value recorded from a single cell on the camera’s sensor chip. Acamera’s resolution ultimately determines the maximum resolution an image can have, but for most forms of output you’ll convert it to a much lower resolution. Image resolution is determined by the number of pixels per inch (ppi for short) that an image contains. This is the measurement that tells us what each image’s print size and quality will be upon output. To ensure that the images used in your design will print well, you need to first check the current resolution and document size before placing an image in your layout and printing from an application such as InDesign or QuarkXPress.
Although the default, suggested print resolution that you should use is 300ppi, modern studies prove that an image really needs to be only 220ppi at 100% of its intended print size to produce a high-quality print. If you are creating an image to be displayed on the Web or exclusively onscreen, the image resolution should be set to 72ppi at 100% of its intended viewing size.
For example, an image that is 3˝ × 2.4˝ at a resolution of 220ppi can produce a high-quality print, but contains more pixels than is needed for web display (web images should be as small as possible so that they can download quickly into a browser). The same 3˝ × 2.4˝ image at a resolution of only 72ppi is small enough to display on the Web and to send as an email attachment, but cannot produce a high-quality print.
When photographing an image to be used in a print design, be sure to use the medium or large capture setting on your digital camera. Doing so allows enough resolution to produce a highquality print at a normal output size. Most consumer-level digital cameras save captured images at a universal resolution of 72ppi. However, at medium and large capture settings, the pixel dimensions are increased, allowing for higher-quality output. When scanning an image for print, be sure to import the image at 100%, using a minimum setting of 220ppi.
The Print Resolution Safety Rule: Higher Is Always Better
If you’re not sure how large you want to use an image in a print design project, always photograph or scan it at a higher input setting. Remember, you can always downsample to a lower resolution, but upsampling to a higher resolution will not improve print quality.
Understanding Resolution for Print
![Understanding Resolution for Print]()
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