Convert from PNG to GIF gives error

[Guest]

Anyone tell me why I get the following error when using NConvert to convert from png to gif?

command used:
nconvert -out gif -o $%.gif "c:\my documents\mypic.png"

error received:
Error: This picture cannot be written using this format (C:\my documents\mypic.gif)

XnView can convert it fine, but nconvert seems to struggle.

[xnview]

Anyone tell me why I get the following error when using NConvert to convert from png to gif?

command used:
nconvert -out gif -o $%.gif "c:\my documents\mypic.png"

error received:
Error: This picture cannot be written using this format (C:\my documents\mypic.gif)

XnView can convert it fine, but nconvert seems to struggle.

use -colors 256

[DOS386]

convert from png to gif?

Problem clarified (GIF restricted to 256 colours), but I would
NOT prefer GIF over PNG anyway ...

PS: Use PNGOUT to convert GIF to PNG or optimize PNG's ...