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Chapter 3. Setting Up a New Document and... > Changing a Document’s Image Size

Changing a Document’s Image Size

Canvas size and image size are different. Changing the canvas size either increases or decreases the amount of canvas on which you have to create. The image size changes the size of the actual image by resampling the image. Resampling is the process of adding or subtracting pixels of an existing file. To change a document’s image size, follow these steps:

Choose Modify, Canvas, Image Size to open the Image Size dialog box.

Use the pixel Height and Width fields to set the width and height of the document in use.

If the Resample Image check box is not selected, the pixel dimensions are not available. In that case, use the print size Height and Width fields to change the size of the image. You can also click the pop-up menu for pixels or inches to change the size of the document by percentage. Notice that when you alter the print size, the resolution changes because the actual number of pixels does not change unless you check the Resample Image check box.

Selecting the Constrain Proportions option keeps the image at the same aspect ratio.

Use the Resolution field when you want to change the image size by increasing or reducing the number of pixels per inch.

The Interpolation pop-up menu is located in the bottom portion of the Image Size dialog box. It contains the following four choices:

  • Bicubic— Generally used for photographs. It usually gives the sharpest and highest quality results. This is the default setting.

  • Nearest Neighbor— Generally used for images with straight lines and text, such as screen shots. Using Nearest Neighbor can result in jagged edges because it closely resembles a zoomed-in screen shot.

  • Bilinear and Soft— Used as an additional alternative if you do not like the results achieved with Bicubic or Nearest Neighbor. Bilinear gives you sharper results than Soft interpolation, but it is not as sharp as Bicubic.

    If you are thinking on a scale of sharpness, Nearest Neighbor gives the sharpest contrast, Bicubic is the next best, Bilinear is okay, and Soft interpolation should be used last. Depending on the kind of artwork you are resizing, one of these four methods should be the best for you.



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