ImageMakeColorTransparent

Description

Creates an image and sets a transparent color.

Returns

Image object

Syntax

imageMakeColorTransparent( img color__)

History

ColdFusion (2016 release): Use the color parameter as an array of color values.

ColdFusion 10: Added this function

Properties

Parameter

Description

img

Required. The ColdFusion image on which this operation is performed.

color

Required. The transparent color:

  • Hexadecimal value of RGB color. For example, specify the color white as "##FFFFFF" or "FFFFFF".
  • String value of color (for example, "black", "red", "green").
  • List of three numbers for ( R, G ,B ) values. Each value must be in the range 0-255.

Multiple transparent colors can be specified using an array.

Example 1

<cfset myImage=ImageNew("",200,110)> 
<!--- Set the drawing color to green. ---> 
<cfset ImageSetDrawingColor(myImage,"green")> 
<!--- Turn on antialiasing to improve image quality. ---> 
<cfset ImageSetAntialiasing(myImage,"on")> 
<!--- Draw a filled green oval on the image. ---> 
<cfset ImageDrawOval(myImage,5,5,190,100,"yes")> 
<!--- Display the image in a browser. ---> 
<cfoutput>PNG image<br></cfoutput> 
<cfset ImageWrite(myImage,"#expandpath('.')#/png.png")> 
<cfset myImage = ImageRead("#expandpath('.')#/png.png")> 
<cfimage source="#myImage#" action="writeToBrowser" > 
<cfset x =ImageMakeColorTransparent(myImage,"green")> 
<cfimage source="#x#" action="writeToBrowser" >

Example 2

The sample below uses an array of RGB colors. 

<cfscript>
 myImage = imageNew("", 200, 200);
 myImage = imageMakeColorTransparent(myImage,["255,255,0","123,123,123","0,0,10"]);
 cfimage(action="writeToBrowser", source=myImage);
</cfscript>

Example 3

In the code sample below, you can see how arrays of multiple colors are used to make the source image transparent.

<cfscript>
 // create array of transparent colors
 arrayOfColors=["237,27,36","35,177,77","255,127,38","112,146,191","254,174,201","185,122,87"];
 imgObj = imageRead("path/to/image/sample.jpg");
 cfimage(action="writeToBrowser", source=imgObj);
 img2=ImageMakeColorTransparent(imgObj,arrayOfColors);
 cfimage(action="writeToBrowser", source=img2);
</cfscript>

Output

Input image

Input image
Input image

Output image

Output image
Output image

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