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Image size and resolution

  1. Photoshop User Guide
  2. Introduction to Photoshop
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    24. Correct imperfections with the Healing Brush
    25. Create brushes in Capture and use them in Photoshop
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    16. Feature summary | Adobe Camera Raw | 2018 releases
    17. New features summary
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  14. Image repair and restoration
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    9. Improve color prints from Photoshop
    10. Troubleshoot printing problems | Photoshop
  22. Automation
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  23. Color Management
    1. Understanding color management
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  24. Content authenticity
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    1. Photoshop 3D | Common questions around discontinued 3D features
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    13. Photoshop and MATLAB
    14. Count objects in an image
    15. Combine and convert 3D objects
    16. 3D texture editing
    17. Adjust HDR exposure and toning
    18. 3D panel settings

Click any of these topics to learn more about the different aspects of image size and resolution:

Printed image resolution

Dimensions are the total number of pixels along the width and height of an image.

Resolution is the number of image pixels assigned to each inch when an image is printed - measured in pixels per inch (ppi). Thus, the more pixels an image has per inch, the greater will be its resolution. And, a high-resolution image will produce a better quality printed output. 

When changing the Dimensions or Resolution, remember that the image data remains constant until you resample it. If you change the resolution, the width and height will change accordingly to maintain the same amount of image data.

Note the relationship between Image Size and Resolution in the Image Size dialog box. 

To navigate to the Image Size dialog box, follow these steps: 

  1. Go to Image > Image Size

    Navigate to the Image Size dialog box
    Navigate to the Image Size dialog box

  2. The Resample option checkbox is checked by default. Use it to adjust the dimensions of your image.
    Image Size dialog box in Photoshop
    Image Size dialog box in Photoshop

    The Image Size dialog box displays the many interpolation options that you can use to make images look crisp and sharp even after enlarging them.

    To your left is the preview window which displays a live preview of what the image will look like based on the chosen settings. To your right are the settings themselves. 

To learn more about Resample option checkbox, go to its detailed description. You can also go through the following table:

Don't check the Resample option

Check the Resample option

If you uncheck the Resample option, you will be able to resize or change the resolution of the image by redistributing existing pixels

The Resample option is checked by default, which means you can adjust the dimensions of the image by adding or taking away pixels from the Width and Height

You can adjust the Width and Height of your image in two ways - either in pixels for images to be used online or in inches (or centimeters) for images to be printed.

Click the link icon to highlight it and preserve proportions, which will help you automatically adjust the height when changing the width. If you do not click the link to preserve proportions, you will get a tall, thin or short, wide image that looks stretched when changing one dimension.

Learn more about the different interpolation methods by referring to Resampling.

Adjust the Width and Height of your image in two ways
Adjust the Width and Height of your image in two ways

Choose the Automatic option, which will help you with default interpolation. For more refined control, you can opt for the other options as well. Each one of these options is designed for specific image enlargement or reduction workflows. 

Automatic and other interpolation options in Image Resize dialog box
Automatic and other interpolation options in Image Resize dialog box

View the current image size
View the current image size

To quickly display the current image size, use the information box at the bottom of the document window.
Then you can position the mouse over the file information box and hold down the mouse left button. 

Monitor resolution

Monitor resolution is measured in pixels. If the resolution of the monitor and pixel dimensions of the image are the same size, the image will fill the screen when viewed at 100%. 

Factors that decide how large an image appears on screen

  • Pixel dimensions of your image
  • Size and resolution settings of your monitor

In Photoshop, you can change the onscreen image magnification, so you can easily work with images of any pixel dimensions.

Photoshop monitor resolution


File size




Printer resolution

Printer resolution is measured in dots per inch (dpi). The higher the dpi, the finer the printed output you’ll get. Most inkjet printers have a resolution of approximately 720 to 2880 dpi.

Printer resolution is different from, but related to, image resolution. To print a high-quality photo on an inkjet printer, an image resolution of at least 220 ppi should provide good results.

Screen frequency is the number of printer dots or halftone cells per inch used to print grayscale images or color separations. Also known as screen ruling or line screen, screen frequency is measured in lines per inch (lpi), or lines of cells per inch in a halftone screen. The higher the resolution of the output device, the finer screen ruling you can use.

The relationship between image resolution and screen frequency determines the quality of detail in the printed image. To produce a halftone image of the highest quality, you generally use an image resolution that is about 1.5 to 2 times the screen frequency.




Photoshop Screen frequency examples
Screen frequency examples


Resolution specs for printing images

A resolution of 300 pixels/inch is the industry standard for high-quality prints. This resolution will ensure that your image looks sharp and detailed when printed. 

A resolution of 300 pixels/inch is perfect for viewing small prints from up close, but you can also opt for lower resolutions for large prints if they are intended to be viewed from far away. For example, if you are printing a billboard to be erected off a highway, you can print it at a lower resolution without compromising on the quality, because high resolution becomes less important as you move farther from the image.

Default resolution in printers

Usually, printers have their default print resolution at 300 pixels/inch, and if you print an image with a lower resolution, they will adjust their image settings to print your image at the default resolution.  

This means, you cannot print an image at less than the printer's default resolution, and if you don't enlarge the image, your printer will.

View the print size onscreen

You can do either of the following to view the print size onscreen - either go to View > Print Size. Or, select the Hand tool or Zoom tool and click Print Size in the options bar. 




Downsampling is decreasing the number of pixels - when you downsample, information is deleted from the image.

Upsampling is increasing the number of pixels - when you upsample, new pixels are added.


Photoshop Resampling pixels
Resampling pixels



You can avoid the need for resampling by scanning or creating the image at a sufficiently high resolution. If you want to preview the effects of changing pixel dimensions onscreen or to print proofs at different resolutions, resample a duplicate of your file.

Photoshop resamples images using an interpolation method to assign color values to any new pixels based on the color values of existing pixels. You can choose your method in the Image Size dialog box.

  • Bicubic A slower but more precise method based on an examination of the values of surrounding pixels. Using more complex calculations, Bicubic produces smoother tonal gradations than Nearest Neighbor or Bilinear.
  • Bicubic Smoother A good method for enlarging images based on Bicubic interpolation but designed to produce smoother results.

You can specify a default interpolation method to use whenever Photoshop resamples image data. Choose Edit > Preferences > General (Windows) or Photoshop > Preferences > General (MacOS), and then choose a method from the Image Interpolation Methods menu.

Change pixel dimensions of an image


  1. Choose Image > Image Size.





  6. When you finish setting options, click OK.



Change the print dimensions and resolution

When creating an image for print media, it’s useful to specify image size in terms of the printed dimensions and the image resolution. These two measurements - referred to as the document size - determine the total pixel count and therefore the file size of the image.



For the highest print quality, it’s recommended to change the dimensions and resolution first, without resampling. Then resample only as necessary.

  1. Choose Image > Image Size.




  4. Under Document Size, enter new values for the height and width. If desired, choose a new unit of measurement. For Width, the Columns option uses the width and gutter sizes specified in the Units & Rulers preferences.



    To restore the initial values displayed in the Image Size dialog box, hold down Alt (Windows) or Option (MacOS), and click Reset.

What affects file size?

File size depends on the pixel dimensions of an image and the number of layers it contains. Images with more pixels may produce more detail when printed, but they require more disk space to store and may take more time to edit and print.

Make sure your files are not too large - for large files, reduce the number of layers in the image or change the image size.


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