To resize a file in Photoshop, you'll use the Image Size dialog box. This allows you to change the dimensions of your image, either making it larger or smaller.
Steps to Resize an Image:
- Open your image: Begin by opening the image you want to resize in Photoshop.
- Navigate to Image Size: Go to the top menu bar and select Image, then choose Image Size. This will open the Image Size dialog box.
- Enter Desired Dimensions: In the dialog box, you'll see fields for Width and Height. Enter the new dimensions you want for your image in these fields.
- Make sure that the "Constrain Proportions" box is checked. This ensures that your image's aspect ratio (the relationship between its width and height) stays the same, preventing distortion. If you don't maintain the proportions, your image might appear stretched or squished.
- Resolution: You will also notice a Resolution setting, usually in pixels/inch or pixels/cm. While not changing the pixel dimensions, this setting affects how the image is printed. Changing the resolution will adjust the image's physical size when printed, however, it won't affect the pixel dimensions if you are only resizing using width and height with "Constrain Proportions" checked.
- Resampling: Pay attention to the "Resample" option. This dictates how Photoshop adds or removes pixels during resizing. When increasing an image's size, Photoshop has to create new pixel data, and there are various ways to do that, with options such as:
- Bicubic Smoother: Best for enlargements.
- Bicubic Sharper: Best for reductions.
- Bicubic Automatic: Photoshop chooses the best method for you.
- Click OK: Once you have entered your desired size and selected your resampling option click OK to apply the changes.
Practical Insights:
- Start with a backup: Before resizing an image, it's a good practice to save a copy of the original image so that you always have the original file. That way, if you are not satisfied with the resizing, you can always go back to the original file.
- Resize for Web: If you're resizing for web use, be sure to optimize your file for optimal loading time and quality using "Save For Web (Legacy)".
- Resolution for Print: Images intended for printing usually require higher resolutions to look good printed than those used on screens.
Table Summary:
| Action | How to Do It | Purpose |
|---|---|---|
| Open Image Size Dialog | Image > Image Size | Access the tool for resizing images. |
| Enter New Dimensions | Input width and height in fields. | Change the pixel dimensions of the image. |
| Maintain Aspect Ratio | Check the "Constrain Proportions" box. | Ensure the image doesn't get distorted. |
| Choose Resampling Method | Choose a method from the "Resample" dropdown. | Control how pixels are added or removed during resizing. |
| Save a Backup Copy | File > Save As before making any changes |
Prevents loss of original file if you are not happy with the resized copy. |
