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Fading an Image Away

, 12 Oct 2003
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Fading an Image Away

Introduction

While working on my new project (chronology control) I needed the ability to differentiate between more and less important parts of data. My idea was to put more important parts of data to the center of screen and have less important part fade away.

Using double buffering I would draw the visible part of the control to bitmap and then fade it proportional to the distance from the center.

Surprisingly enough, I didn't find a quick and simple solution to the problem of gradually fading away the bitmap, anywhere on the net. Thus disregarding the danger of my short-n-cute article being stigmatized as "yet another LinearGradientBrush derivate", I decided to share this neat trick with you.

How to Fade an Image Away

The solution to this problem is painting a simple transparent gradient over the image. I use linear gradient in the demo, but you could use path gradient to achieve more spectacular results. This gradient must progress from completely transparent black color - this will give the important part of your picture less vague appearance with natural colors - towards less transparent color of the background.

Technically, from alpha 0 and RGB(0,0,0) to alpha 255 and the background color.

Following code does it all:

// Preconditions: image, graphics and backColor initialized
Rectangle imageRect=new Rectangle(0,0,image.Width,image.Height);
// Place it on the window.
graphics.DrawImage(image,imageRect);
// Create gradient brush from black to window's back color.
LinearGradientBrush brush=new
LinearGradientBrush(new Rectangle(0,0,image.Width,image.Height),
    Color.FromArgb(0,0,0,0),
    backColor,
    0,false);
// And paint it over image...
e.Graphics.FillRectangle(brush,imageRect);
// ...voila!

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

About the Author

Tomaž Štih
Founder Wischner Ltd
United Kingdom United Kingdom
No Biography provided

Comments and Discussions

 
Generalrecognition Pinmemberamir mortazavi26-Jan-05 18:37 
Generalconver to c++ PinmemberLior Shoval18-Oct-03 6:21 
GeneralRe: conver to c++ Pinmembertstih22-Oct-03 1:09 
Generalnew interesting job PinmemberEgidio13-Oct-03 0:48 
GeneralRe: new interesting job Pinmemberthebeekeeper21-Feb-07 13:00 

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