Image Size <Ctrl+Alt+I>

You can change the photo size. Pixel Dimensions is the number of pixels composing a photo. The photo file capacity and quality are dependent on pixel dimensions.

Steps

To change the image size

Open the photo whose pixels are larger than 5000X5000 pixels.
Click Edit > Image Size.
In the Image Size dialog box, select the Constrain Proportions check box.
Constrain Proportions is checked by default. Select the check box only when it is unchecked.
Delete the value in the 1 decimal place in Width under Pixel Dimensions.
EX) If, for a photo in 5009X5009 pixels, you remove '9' which is in the 1 decimal place, the pixels of a photo change to 500X500 pixels.
Click OK.

More Information

Image Size Dialog Box

Pixel Dimensions

You can change the width and height values. The unit is pixel.

Width: Specify the width.
Height: Specify the height.

Document Size

You can view the size information about a photo file. If you retrieve a photo file from Hangeul program, for example, it will be displayed in the size set in Document Size.

Width: Specify the width.
Height: Specify the height.
Resolution: Adjust the photo quality. For internet homepages or displaying images, you are recommended to use 75DPI, 150DPI for printing and 300DPI for publishing. If you use a resolution higher than the recommended vale, the quality will be improved, but the file size is also increased.

Constrain Proportions

You can shrink or magnify a photo while maintaining the ratio of the original photo. Change either width or length, and the other value will be automatically calculated.

Resample Image

You can make the width and height values in Pixel Dimensions change accordingly when the document size is changed. If you deselect Resample Image and you change the photo size in Document Size, any values in Pixel Dimensions will not be changed.
The image quality will be degraded if you magnify the photo size by two times or more. If you want to have high quality photos, you need to use a high resolution when you take the picture. Photo shrinking does not cause significant image quality loss