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References: <002401c1f1e5$a229d5a0$b6010b98@MOBILENICK>
            <[log in to unmask]>
Content-Type: text/plain; charset="iso-8859-1"
Message-ID:  <00a001c1f206$dd3e7cb0$b6010b98@MOBILENICK>
Date:         Thu, 2 May 2002 14:25:17 -0400
Reply-To:     ImageJ Interest Group <[log in to unmask]>
Sender:       ImageJ Interest Group <[log in to unmask]>
From:         Nick Linnenbrügger <[log in to unmask]>
Subject:      Re: LUT used for thresholding

Thanks for your help, Bob! It works well and solves my problem ...

Nick.

----- Original Message -----
From: "Bob Dougherty" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, May 02, 2002 1:28 PM
Subject: Re: LUT used for thresholding


> Nick,
>
> Here is a brute force solution.
>
> Bob
>
>
> --
> Robert Dougherty
> President, OptiNav, Inc.
> (425) 467-1118
> [log in to unmask]
> http://www.optinav.com
>
>
>
>
>


----------------------------------------------------------------------------
----


> import ij.*;
> import ij.plugin.filter.PlugInFilter;
> import ij.process.*;
> import java.awt.*;
> import java.awt.image.*;
>
> /** This plugin gets the LUT of an image. */
>
> public class BW_LUT_check implements PlugInFilter {
>
>         ImagePlus imp;
>
>         public int setup(String arg, ImagePlus imp) {
>                 this.imp = imp;
>                 return DOES_ALL-DOES_RGB+NO_CHANGES;
>         }
>
>         public void run(ImageProcessor ip) {
>                 LookUpTable lut = imp.createLut();
>                 int mapSize = 0;
>                 java.awt.image.ColorModel cm = lut.getColorModel();
>                 byte[] rLUT,gLUT,bLUT;
>         if (cm instanceof IndexColorModel) {
>                 IndexColorModel m = (IndexColorModel)cm;
>                 mapSize = m.getMapSize();
>                 rLUT = new byte[mapSize];
>                 gLUT = new byte[mapSize];
>                 bLUT = new byte[mapSize];
>                 m.getReds(rLUT);
>                 m.getGreens(gLUT);
>                 m.getBlues(bLUT);
>         } else {
>                         mapSize = 256;
>                 rLUT = new byte[mapSize];
>                 gLUT = new byte[mapSize];
>                 bLUT = new byte[mapSize];
>                 for (int i = 0; i < mapSize; i++){
>                         rLUT[i] = (byte)i;
>                                 gLUT[i] = (byte)i;
>                                 bLUT[i] = (byte)i;
>                         }
>                 }
>                 boolean couldBeBW = true;
>                 //Try to rule out B&W LUT
>                 //First make sure R=G=B for all entries
>                 for (int i = 0; i < mapSize; i++){
>                         if((rLUT[i] != gLUT[i])|(rLUT[i] != bLUT[i])){
>                                 couldBeBW = false;
>                                 break;
>                         }
>                 }
>                 if (couldBeBW) {
>                         //Check that all LUT entries are 255 or 0.
>                         for (int i = 0; i < mapSize; i++){
>                                 if(((rLUT[i]&0xff) != 255)&(rLUT[i] !=
0)){
>                                         couldBeBW = false;
>                                         break;
>                                 }
>                         }
>                 }
>
>                 if (couldBeBW) {
>                         IJ.showMessage("BLACK_AND_WHITE_LUT");
>                 } else {
>                         IJ.showMessage("Not BLACK_AND_WHITE_LUT");
>                 }
>         }
> }
>

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