convert to PNG8 crashs on one-color image

[helour]

Try this command on a simple one-color (green, 256x256 pixels) image:

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convert picture.png PNG8:new_picture.png

Result is crash with this information:

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convert: Memory allocation failed `new_picture.png' @ png.c/WriteOnePNGImage/6493.

[Drarakel]

What version of ImageMagick do you use?
I get such errors (no crash) only in older IM versions.

[snibgo]

See the "Problems with Png" thread: viewtopic.php?f=3&t=16490

If you are not on the current IM, an upgrade might fix it.

[helour]

Hello boys, newest Centos version 6.6.2 works (I have to copied couple of files into /usr/lib & /usr/bin), only warning was there:

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convert: Invalid background palette index `new_picture.png' @ warning/png.c/PNGWarningHandler/1457

Thanks.

PS: Maybe there are some problems with mandriva packages, I need to check it... /long story/

[helour]

I tried kubuntu instead of mandriva and it works OK without any warning.

[Drarakel]

It's only a warning and not a real problem (unless you need a background color chunk in the PNG).
But to be honest, I wouldn't recommend using PNG8 in the current IM versions - it's a bit risky.
(It's all in here: viewtopic.php?f=3&t=16490)