Image

An Image has a width and a height. With the Image type, found in System.Drawing, we load an image file and quickly determine these values.

The Image type is an abstract data type that represents an image. It returns the data, Width and Height and other information about an image.

Example

To start, this program imports the System.Drawing namespace. If this creates an error, go to Add Reference to add the System.Drawing assembly.

Info Upon execution the program loads an image located in a specific file on the disk.

Note After Image.FromFile returns the Image reference, we can access the Width, Height and PhysicalDimension properties.

Imports System.Drawing

Module Module1
    Sub Main()
        ' Load Image from file.
        Dim i As Image = Image.FromFile("C:\background1.png", False)

        ' Print dimensions of Image.
        Console.WriteLine(i.Width)
        Console.WriteLine(i.Height)
        Console.WriteLine(i.PhysicalDimension)
    End Sub
End Module180
110
{Width=180, Height=110}

A discussion

Image does not handle all image formats, but it works on common ones such as PNG and JPG. We can use Image to read in width and height, and output that to HTML.

Image can be helpful for getting image information. Often height and width must be determined so that the data can correctly fit into the surrounding content or UI.

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This page was last updated on Sep 28, 2022 (edit).

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