If we want to change an image's size, we have to understand how the image is formed. When we zoom in on an image very large, the image appears in small square pixels from which it is made. Photoshop controls these pixels through PPI (pixel-per-inch). Here PPI (pixel-per-inch) refers to the total number of pixels in each inch. The number of pixels in an image is the resolution of the image. Usually, 300 PPI is considered sufficient resolution for printing the image. But higher resolution can also be kept.


Image Size ( Image Size And Re-Sampling)

To change the size of the image in Photoshop, the command Image size (Image>image size) is used. The Image size command is used by going to the Image menu of Photoshop. The shortcut key for this is Alt+Ctrl+I, after the Image size dialog box is opened, we change the document size of our image, then later see the Resolution and pixels dimensions. Everything in the Image Size dialog box is related to the image size and resolution.

You can also change the size of the image in Photoshop as per your requirement. With the Image Size command, you can change the direction of the pixels and change the resolution of the print and image.

Work On A Copy When Changing Image Sizes

Changing the image size changes the color information in the image, so you'll want to resize the image forty times and save it so you can decide which is better. Each time Image Shop changes the image, it adds or removes pixels, thereby reducing the variety of the image.

Document Size

The document size that you are changing is the physical size of the image. Professional people always measure the size of the image in pixels, while many of us measure the size of the image in terms of physical size. Here physical size refers to the size in which the image will be printed. The unit of the scale of Document Size is in percent, Inch, Centimetres, Millimetres, Point, Columns. We choose the unit according to us and change the value of width and height of the image.

Pixel Dimensions

This area specifies the number of pixels it contains. When we enter a value in the document size, the number of pixels in the length and width is displayed in the pixel dimensions. Here the size of the image can also be increased by adding the number of pixels.

Resample Image

If we want to increase or decrease the image's physical size while keeping the image constant, we have to choose the Resample Image option. With this, one can increase or decrease the image's physical size, but the resolution of the image remains constant, due to which the quality of the image remains. After selecting Resample Image, a drop-down menu is displayed at the bottom, in which various Resampling options are displayed. 

If we want to reduce the size of the image, then the Bicubic Sharper option has to be selected, it automatically applies to sharpen the image, so that the image looks very clear even though it is small. If we are increasing the size of the image, then the Bicubic Smoother option has to be selected. Similarly, there are more options in the Drop Down Menu. Choose the option which seems appropriate.

Changing image size rather than resolution ( Changing Size, But Not For Resolution Images)

1. First Open All The Resized Images (Ctrl + O).

2. The Image Size Dialog Box Will Appear On The Screen As Shown In The Picture.

3. Keep In Mind That Resample Is Checked In The Image. 'Resample Image' Instructs Photoshop That Whenever The Size Of The Image Is Changed, Its Resolution Does Not Change. If You Enlarge The Image, Photoshop Will Add Pixels To It. If You Shrink The Image, Photoshop Will Remove The Pixels From It.

4. In 'pixel Dimensions' Put 200 In Width And 200 In Height Also. To Put The Value As A Percentage Of The Current Dimension, Select 'percent' As The Unit's Measure.

5. Finally Click On The Ok Button. A New Size Image Will Come.


Resolution or DPI refers to the number of dots or pixels per inch of the image. When changing the resolution, Photoshop runs a complex algorithm for the image to know what to change. Image Shop does a great job of adding and subtracting pixels, but it's no magic. At most, you can fill the resolution up or down to about 1/3 before it really affects the image.

Changing Resolution For Images

Sometimes You'll Have An Image That Was Scanned At A Higher Or Lower Resolution Than You Needed. It Won't Change Its Size, You Just Need To Change The Resolution. To Change The Resolution, You Will Follow The Following Procedure.

  • Open Photoshop
  • Image – Select Image Size.
  • Then The Image Size Dialog Box Will Appear On The Screen.
  • To Change Just The Print Or Print Dimensions, Proportionally Correct Some Number Of Pixels In The Image. Note That “resample Image” Is Selected. Then Choose An 'Interpolation' Method.
  • To Change The Print Dimensions And Resolution Without Changing The Pixels, De-select 'resample Image'.
  • Under 'document Size', Enter The Value Of 'width', 'height' Or 'percent' Of The Image As Per Your Wish.
  • Finally, Click On The Ok Button. The Image Will Come In A New Resolution (200 Pixels Per Inch).


I am an engineer by profession but being a blogger is my old day's dream to create my site for those who are more curious about my birthplace than I am coming from (India). the current city lives in Navi Mumbai, India

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