Resizing allows you to make the Pixel Size larger or smaller than the original image. If you have several images from the same camera that you want to print the same size, some after cropping and some without cropping, then the DPI of those images must be different. Pixel Size alone determines how much information or "quality" in stored in the image file.Ĭropping an image is used to recompose the shot to include only portions of the original image, or to change the Aspect Ratio - the height relative to the width - of the photo. For example, changing that same image to 600 DPI, which would yield a 4 inch by 5 print.ĭPI and Print Size only matter when printing an photo DPI is irrelevant to images on screen, in email, or otherwise viewed, edited or used on a computer. Changing only the DPI in no way affects the file size on the photo or the pixel size, it only changes the Print Size.
For example, the 3000x2400 pixel image from the example above, when printed at 300 DPI will be exactly 10 inches by 8 inches (3000 pixels / 300 pixels per inch = 10 inches). Print size is determined by two things: Pixel Size and how many pixels to print in a given physical size, commonly called DPI or dots per inch or PPI, pixels per inch. Generally speaking, a higher megapixel camera will produce larger files. This is based on image content and is due to compression techniques used to make the file as small as possible. However, the File Size for different photos from the same camera will vary. Any time a measure of length, like inches or centimeters, is used to describe a digital image, they are referring to Print Size.Įvery digital photograph from a given camera will start out with the exact same Pixel Size, which will be something like 3000x2400 pixels, or about 7 megapixels and corresponds to the number of photo sites or pixels your camera's sensor has. Print Size - measured inches, millimeters, or other physical units of measure.
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