ImageMakeColorTransparent

Last updated on May 30, 2024 | Also applies to ColdFusion

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CFML Reference User Guide
ColdFusion functions
ColdFusion tags
1. ColdFusion tag summary
2. ColdFusion tags by category
  1. Application framework tags
    1. cfapplication
    2. cfassociate
    3. cferror
    4. cfimport
    5. cfinterface
    6. cflock
    7. cfscript
    8. cfthread
  2. Communications tags
  3. Database manipulation tags
  4. Data output tags
    1. cfchart
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    1. cfchart
    2. cfchartdata
    3. cfchartseries
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    8. function
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Cloud services

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.

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

<cfoutput>PNG image<br></cfoutput>

<cfset myImage=ImageNew("",200,110)>  <cfset ImageSetDrawingColor(myImage,"green")>  <cfset ImageSetAntialiasing(myImage,"on")>  <cfset ImageDrawOval(myImage,5,5,190,100,"yes")>  <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" >

<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.

myImage = imageNew("", 200, 200);

myImage = imageMakeColorTransparent(myImage,["255,255,0","123,123,123","0,0,10"]);

cfimage(action="writeToBrowser", source=myImage);

</cfscript>

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

<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.

// 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>

<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>

<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>