Png Image support of J2ME WTK Emulator - java

I use a png image in my project that is not displayed in emulator but it can be displayed in phone. Then i open it with photoshop, save as png and use that image. It is displayed both emulator and phone. I couldn't figure out the difference of original and edited one. And is there any setting of emulator for image display? And how can i understand any png file is supported or not?
original image
edited image

I preferred PNG files is good for MIDP. You can check following links, It will helps you.
What image types does MIDP support?
Image Formats in J2ME

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EDIT::
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Edited:
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http://sourceforge.net/projects/javaocr/

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