invalid bitdepth ? how to solve it?

[Google Code Exporter]

What steps will reproduce the problem?
1. add jars.
2. write a sample to genarate the png image follow the PngCreate class in the 
source jar.
3. run it.

What is the expected output? What do you see instead?

ar.com.hjg.pngj.PngjException: invalid bitdepth=5
    at ar.com.hjg.pngj.ImageInfo.<init>(ImageInfo.java:93)
    at ar.com.hjg.pngj.ImageInfo.<init>(ImageInfo.java:50)
    at cn.xiazhengxin.blog.util.GenPng.Create(GenPng.java:22)
………………

What version of the product are you using? On what operating system?

JDK 6u21 on ubuntu 10.04

Please provide any additional information below.

none.

Original issue reported on code.google.com by [e-mail] on 29 Aug 2010 at 9:46

[Google Code Exporter]

Apparently you are creating a file with a bitdepth=5? That is a invalid value, 
PNG only supports 1/4/8/16 -a and is library currently only supports RGB (8 or 
16 bits)

Original comment by [e-mail] on 25 May 2011 at 5:10