Conversion and version of imageJ ?

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Conversion and version of imageJ ?

Remi Cerise
Hello,
 
I started working on imageJ and I have to write  a plugin that apply  
different treatments onto a BMP image format.In particularly, I need to get its  
histogram after converting my image to "8-bits" (grey scale).
To process this conversion, I simple use the JAVA language and the IJ API
 

ImageConverter ic = new ImageConverter(img);
ic.convertToGray8();
 
I have imageJ 1.36b and work with JDK 1.5 (JAVA 1.5.0_06) and with this  
version, there is no problem.

 
But when I try it on an older version (unfortunately I don't know exactly  
which version, because it is a version a friend downloaded sooner), the  
histogram is not as expected, because it contains some irregularities. However  if I
manually do
 
Image=>Type=>8-bits
Anlyse=>Histogram
 
I get a "good" histogram, and so, I suppose, a good conversion. Is those  
differences due to versions of the IJ API ?
 
Thanks.