Image vs Bitmap class

Question

I have trouble understanding the differences between the Image class and the Bitmap class  Now  I know that the Bitmap inherits from the Image but from what I understand both are very similar  Can anyone shed some light on this please

User · Accepted Answer

The Bitmap class is an implementation of the Image class. The Image class is an abstract class;

The Bitmap class contains 12 constructors that construct the Bitmap object from different parameters. It can construct the Bitmap from another bitmap, and the string address of the image.

See more in this comprehensive sample.

User · Answer

Image provides an abstract access to an arbitrary image   it defines a set of methods that can loggically be applied upon any implementation of Image  Its not bounded to any particular image format or implementation   Bitmap is a specific implementation to the image abstract class which encapsulate windows GDI bitmap object  Bitmap is just a specific implementation to the Image abstract class which relay on the GDI bitmap Object   You could for example   Create your own implementation to the Image abstract   by inheriting from the Image class and implementing the abstract methods   Anyway   this is just a simple basic use of OOP   it shouldn t be hard to catch

User · Answer

This is a clarification because I have seen things done in code which are honestly confusing - I think the following example might assist others   As others have said before - Bitmap inherits from the Abstract Image class  Abstract effectively means you cannot create a New   instance of it       Image imgBad1   new Image              Bad - won t compile     Image imgBad2   new Image 200 200      Bad - won t compile   But you can do the following       Image imgGood      Not instantiated object         Now you can do this     imgGood   new Bitmap 200  200     You can now use imgGood as you would the same bitmap object if you had done the following       Bitmap bmpGood   new Bitmap 200 200     The nice thing here is you can draw the imgGood object using a Graphics object      Graphics gr   default Graphics       gr   Graphics FromImage new Bitmap 1000  1000        Rectangle rect   new Rectangle 50  50  imgGood Width  imgGood Height      where to draw     gr DrawImage imgGood  rect     Here imgGood can be any Image object - Bitmap  Metafile  or anything else that inherits from Image

[c#] Image vs Bitmap class

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