ImageMagick comes with a utility called convert. The following usually works for me when I need to convert .png files to the 24 bit .bmp format required by Spreadsheet::WriteExcel: 
    convert file.png file.bmp

[download]

--
John.

In reply to Re: png to bmp 24 by jmcnamara
in thread png to bmp 24 by Anonymous Monk

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