Transparent Fill in Circle

[ganeshjothikumar]

Hi All
          I have an image and I have drawn a circle on the image using Oval Roi and filled it with a random colour. Code snippet is below
   
  >                     ImagePlus imp = WindowManager.getCurrentImage();
>                     ip = imp.getProcessor();
>                     Roi roi = new OvalRoi(10,10,100,100);
>                     ip.setColor(new Color(13,14,23));
>                     ip.setMask(roi.getMask());
>                     ip.setRoi(roi.getBoundingRect());
>                     ip.fill(ip.getMask());
>                     imp.updateAndDraw();

  Now when the circle is filled it is opaque and it hides the portion of the image over which it is dawn. Nw I want it to be tranparent so that the circl is also filles with colour and at the same time the image bhind is also seen transparently.. Is there a way to do this... Any help is most welcome
   
  Thanks in advance
  ganesh
   

       
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[dscho]

Hi,

On Wed, 1 Aug 2007, Ganesh Jothikumar wrote:

>           I have an image and I have drawn a circle on the image using Oval Roi and filled it with a random colour. Code snippet is below
>    
>   >                     ImagePlus imp = WindowManager.getCurrentImage();
> >                     ip = imp.getProcessor();
> >                     Roi roi = new OvalRoi(10,10,100,100);
> >                     ip.setColor(new Color(13,14,23));
> >                     ip.setMask(roi.getMask());
> >                     ip.setRoi(roi.getBoundingRect());
> >                     ip.fill(ip.getMask());
> >                     imp.updateAndDraw();
>
>   Now when the circle is filled it is opaque and it hides the portion of the image over which it is dawn. Nw I want it to be tranparent so that the circl is also filles with colour and at the same time the image bhind is also seen transparently.. Is there a way to do this... Any help is most welcome

I think that you have to use the "getImage()" method of ColorProcessor to
get a java.awt.Image, use "getGraphics()" on the result to get a
java.awt.Graphics instance.  On this instance, you can use "setColor()"
with a transparent colour, "fillRectangle()" to fill it, and then use the
original ImageProcessor's "setPixels()" method with the pixels obtained by
"new ColorProcessor(image).getPixels()" on the java.awt.Image.

Maybe you have to call ColorProcessor's
"setSnapshotPixels(ip.getPixels())" method before, and
"reset(ip.getMask())" after.  I don't know off-hand.

ImageJ does not know about transparency.

Hth,
Dscho

[Robert Dougherty]

Ganesh and Dscho,
>
> ImageJ does not know about transparency.
>
ImageJ knows a little about transparency: ColorBlitter.  See my Layers
plugin for use.

Bob


Robert P. Dougherty, Ph.D.
President, OptiNav, Inc.
Phone [phone]
Fax [phone]
www.optinav.com

[vbindokas]

One work-around would be to duplicate the ROI, fill the copy, copy the
filled image, and paste it back to the original image using "paste
control" blend option.

Robert Dougherty wrote:

> Ganesh and Dscho,
>  
>> ImageJ does not know about transparency.
>>
>>    
> ImageJ knows a little about transparency: ColorBlitter.  See my Layers
> plugin for use.
>
> Bob
>
>
> Robert P. Dougherty, Ph.D.
> President, OptiNav, Inc.
> Phone [phone]
> Fax [phone]
> www.optinav.com
>  

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