You can access image size and resolution information and make any necessary adjustments by using the Image Size dialog box. To display the dialog, choose Image --> Image Size, or press Option+F+I / Alt+Ctrl+I.
The top of the Image Size dialog displays the overall file size as well as the image width and height dimensions in pixels. The center of the dialog displays the current document size in the measurement of your choice (the default unit is inches), as well as the current image resolution value in pixels per inch.
With the Resample Image check box selected, you can raise or lower the resolution value while maintaining the current document size. Lowering the resolution (called downsampling) decreases the pixel dimensions of the image by removing pixels and reduces the overall file size. The following image has been downsampled from 300ppi to 72ppi; notice that the file size displayed at the top of the dialog has been reduced.
Increasing the resolution value (called upsampling) adds pixels to the image and increases the file size. When preparing images for print, you will most likely be downsampling rather than upsampling. Downsampling is a great way to resize large images before placing them into a page layout. The following imagehas been upsampled from 300ppi to 600ppi; notice that the file size displayed at the top of the dialog has been increased.
With the Resample Image option deselected, you can raise or lower the resolution value and alter the document size while maintaining the current pixel dimensions. In other words, you can resize an image in this way without adding or removing pixels. Doing so does not alter the file size or create a noticeable change in the image when viewed onscreen. It affects only the document size and the quality of the image when printing. In order to get a high-quality print from the following image, you must deselect the Resample Image option in the Image Size dialog and increase the resolution value to at least 220ppi. Doing so outputs the image at a much smaller print size.
Size Your Images First
To produce a high-quality print of your layout, make sure—prior to placement in your layout application—that your images are large enough to print at the intended size and are at least 220ppi. It helps to size your images appropriately ahead of time; otherwise, they may be too small to include in your layout.
The top of the Image Size dialog displays the overall file size as well as the image width and height dimensions in pixels. The center of the dialog displays the current document size in the measurement of your choice (the default unit is inches), as well as the current image resolution value in pixels per inch.
With the Resample Image check box selected, you can raise or lower the resolution value while maintaining the current document size. Lowering the resolution (called downsampling) decreases the pixel dimensions of the image by removing pixels and reduces the overall file size. The following image has been downsampled from 300ppi to 72ppi; notice that the file size displayed at the top of the dialog has been reduced.
Increasing the resolution value (called upsampling) adds pixels to the image and increases the file size. When preparing images for print, you will most likely be downsampling rather than upsampling. Downsampling is a great way to resize large images before placing them into a page layout. The following imagehas been upsampled from 300ppi to 600ppi; notice that the file size displayed at the top of the dialog has been increased.
With the Resample Image option deselected, you can raise or lower the resolution value and alter the document size while maintaining the current pixel dimensions. In other words, you can resize an image in this way without adding or removing pixels. Doing so does not alter the file size or create a noticeable change in the image when viewed onscreen. It affects only the document size and the quality of the image when printing. In order to get a high-quality print from the following image, you must deselect the Resample Image option in the Image Size dialog and increase the resolution value to at least 220ppi. Doing so outputs the image at a much smaller print size.
Size Your Images First
To produce a high-quality print of your layout, make sure—prior to placement in your layout application—that your images are large enough to print at the intended size and are at least 220ppi. It helps to size your images appropriately ahead of time; otherwise, they may be too small to include in your layout.
Resizing Images in Photoshop
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