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Posted 12 Oct 2003

Fading an Image Away

, 12 Oct 2003
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Fading an Image Away


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.
// Create gradient brush from black to window's back color.
LinearGradientBrush brush=new
LinearGradientBrush(new Rectangle(0,0,image.Width,image.Height),
// And paint it over image...
// ...voila!


This article, along with any associated source code and files, is licensed under The MIT License


About the Author

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

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Comments and Discussions

Generalrecognition Pin
amir mortazavi26-Jan-05 18:37
memberamir mortazavi26-Jan-05 18:37 
Generalconver to c++ Pin
Lior Shoval18-Oct-03 6:21
memberLior Shoval18-Oct-03 6:21 
GeneralRe: conver to c++ Pin
tstih22-Oct-03 1:09
membertstih22-Oct-03 1:09 
Generalnew interesting job Pin
Egidio13-Oct-03 0:48
memberEgidio13-Oct-03 0:48 
GeneralRe: new interesting job Pin
thebeekeeper21-Feb-07 13:00
memberthebeekeeper21-Feb-07 13:00 

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