How to Change Image Dimensions in Photoshop CS5: A Step-by-Step Guide

Changing image dimensions in Photoshop CS5 is a breeze once you know where to look and what to do. In a nutshell, you’ll be using the Image Size dialog box to tweak the width, height, and resolution of your image. After reading this, you’ll be resizing your images like a pro in no time!

Step by Step Tutorial: Changing Image Dimensions in Photoshop CS5

Before diving into resizing your image, let’s understand what we’re about to do. The steps below will guide you through altering the dimensions of your image without compromising its quality. You’ll learn how to access the Image Size dialog box and make the necessary changes.

Step 1: Open the Image Size Dialog Box

To begin, go to the Image menu and select Image Size.

This is where all the magic happens. The Image Size dialog box is your control panel for changing the height, width, and resolution of your image.

Step 2: Uncheck the Resample Image Box

If you want to maintain the image’s quality, make sure ‘Resample Image’ is unchecked.

By keeping this box unchecked, you ensure that Photoshop maintains the image’s pixel dimensions, which is crucial for maintaining the image’s quality.

Step 3: Enter New Dimensions

Type in the new width or height for your image. Photoshop will automatically adjust the other value to maintain the aspect ratio.

This step is key to getting your desired image size. If you need a specific width or height, this is where you input those numbers. Remember, if you want to maintain the original aspect ratio, you only need to change one of these values – width or height – and the other will automatically adjust.

Step 4: Adjust the Resolution (Optional)

If you need to change the resolution, type the new value into the Resolution box.

This step is optional and usually necessary if you’re preparing your image for print. A higher resolution means more pixels per inch, resulting in a sharper print image.

Step 5: Click OK

After entering your desired dimensions and resolution, click OK to apply the changes.

And you’re done! Your image now has the new dimensions you set, and you can go ahead and save your resized image.

After completing these steps, your image will have the new dimensions you entered, and you’ll be ready to use it for whatever project you have in mind.

Tips for Changing Image Dimensions in Photoshop CS5

  • Always keep an original copy of your image before making changes.
  • To maintain the quality of your image, avoid upsampling, which increases the size of your image beyond its original dimensions.
  • Use the ‘Save As’ function to save the resized image under a new file name, preserving the original.
  • If you’re resizing for web use, aim for a lower resolution to reduce file size without significantly affecting on-screen quality.
  • Consider the aspect ratio of your image when changing dimensions to avoid distorting the image.

Frequently Asked Questions

What is aspect ratio?

Aspect ratio refers to the relationship between the width and height of an image.

It’s important to maintain the aspect ratio when resizing to prevent your image from looking stretched or squashed.

Why should I uncheck ‘Resample Image’?

Unchecking ‘Resample Image’ keeps the image’s pixel dimensions the same, which helps maintain image quality.

When you resample an image, you’re either adding or subtracting pixels, which can lead to a loss of image quality.

Can I change image dimensions without altering the file size?

Not significantly. Changing image dimensions will inherently affect the file size, especially if you’re changing the resolution.

However, you can minimize the change in file size by adjusting the dimensions proportionally and keeping the resolution the same.

How do I change the resolution without changing the dimensions?

Simply uncheck ‘Resample Image’ and type in the new resolution. The dimensions will stay the same.

Remember, changing the resolution without resampling will change the print size of the image but not the pixel dimensions.

If I need to increase an image’s size, what’s the best way to maintain quality?

The best way to increase image size while maintaining quality is to start with the highest resolution possible and make incremental changes.

If you must increase size significantly, consider using dedicated software or Photoshop features designed for upsampling.


  1. Open the Image Size dialog box.
  2. Uncheck ‘Resample Image’.
  3. Enter new dimensions.
  4. Adjust the resolution (optional).
  5. Click OK.


Mastering how to change image dimensions in Photoshop CS5 is a fundamental skill that can elevate your design and photography work to a professional level. Remember, with great power comes great responsibility – always maintain a copy of the original image before making changes and be mindful of aspect ratios and image quality. Whether you’re resizing for print, web, or personal use, these steps will ensure your images look sharp and maintain their integrity. Keep experimenting with different dimensions and see how they impact your visuals. If you ever find yourself stuck or unsure, refer back to this guide, and you’ll be on your way to becoming a Photoshop wizard. Happy editing!

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