Resizing Images Using Photoshop Or Photoshop Elements
One can resize images using several different methods with Adobe's Photoshop or Photoshop Elements. To obtain the best results when using these methods, one should have a good grasp of the concepts behind each method of resizing.
To resize an image, open the Image Size dialog box. In Photoshop or Photoshop Elements, open a sample image. From the menu bar, select Image > Resize > Image Size (In Photoshop, select Image > Image Size ) and the following dialog box will appear.
Resizing without resampling changes the physical size of a printed image, but does not change the pixel dimensions of the image. No data is added or removed from the image. When you uncheck, or turn off, Resample Image , the pixel dimension fields are not available, and the only two values you can change are the physical size (width and height) or the resolution (pixels/inch). Note: One should keep the Constrain Proportions checked to maintain the image aspect ratio.
Source: www.pacameraclub.com
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