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Image Size
What is image size?

Image Size is the term used to describe the height and width of an image, which is generally measured in pixels (in short for “picture element”), the minute building blocks that create all digital images. An image is made up of a grid of jillions of pixels, each of different colors, which if zoomed closer, can be viewed as tiny blocks of single-colored squares.

About Pixel Dimensions and Print Image Resolution

Pixel dimensions determine the total number of pixels along the horizontal and vertical measurements of an image. It is measured by multiplying both the width and the height by the dots (of ink) that are printed per inch (DPI). Whereas, Print Resolution is solely the fineness of detail in a printed image, and is measured in pixels per inch (PPI).

Resolution sets the number of pixels that will be pressed into every single inch of paper, both horizontally and vertically, thereby regulating the print size of an image. The more pixels per inch, the higher is the resolution; the higher the resolution, the higher will be the quality in terms of details and sharpness.

Resolution is super essential, when it comes to printing, as an image with a higher resolution yields a superior printed image quality, whereas a low-resolution image appears blurred, distorted and unprofessional.

Similarly, it is extremely important to have a sound knowledge of how image size, pixels, and resolution are interrelated in order to achieve the best results while resizing images, both for print and the web.

Photoshop was created for print as well as web work. Thus, the program gives you the option to change print dimensions or pixel dimensions. When you’re saving the image for the web, you need not care about the print size; your only concern is pixel dimensions.

Using the Crop Tool

This is one of the most necessary tools in Photoshop. Using the crop tool is very simple and any beginner can become proficient in little time. Its flexibility allows you to make use of it in several ways, particularly when you want to focus on a specific element in the image.

Even though cropping diminishes the dimensions of an image, it is very different than resizing. In cropping, you trim off part of an image to achieve a new shape, but cropping does not alter the size of the image content at all. Whereas, resizing preserves the entire image but modifies the size of it. Resizing reduces the “weight” of a picture by successfully bringing down the real size of the image.

When you typically use it to resize an image, the file size and the pixel dimensions will change but the image won’t be resampled. With the Crop tool, the resolution and the pixel dimensions include more pixels per inch based on the dimension of the crop area. But, Photoshop doesn’t particularly insert or reduce data from the image. When an image is cropped, you are removing data from or adding data to the original image size in order to produce a different image. Since you are adding or removing data pertinent to the original image, the idea of resampling no longer bears credence since the number of pixels per inch can differ depending on the number of pixels present in the crop selection region. Whenever the number of pixels in the crop area permits, Photoshop does its best to retain the actual resolution of the original image. This technique is viewed as cropping without resampling. Though, when you are not precise regarding the number of pixels you select, both the file size and the pixel dimensions change in the new image.