Legacy ImageMagick Discussions Archive

Hi
I have PNG images of dimension 3600 X 3600 with 72 DPI and transparent background . I'm trying to change the DPI to 300. I tried below commands but its not working at all

convert Img1.png -strip -units "PixelsPerCentimeter" -density 300 Img2.png
convert Img1.png -resample 300 Img2.png

I tried my best but not able to find any solution. The same command is working fine if I convert the image form PNG to JPG or some other format.
can any one please help me with this.

PNG does not support units of pixels-per-inch. IM will automatically convert it to the corresponding pixels-per-centimeter. Note 2.54cm per inch is the conversion.

You have told it in the first command to convert to 300 dots per centimeter. DPI is dots per inch

Thanks.
I changed my command as convert "D:\1.png" -units "PixelsPerCentimeter" -strip -density 118.12 "D:\2.png" .
This works fine in my local system(Windows 7 64 bit ) but not in Win Server 2003. I'm using ImageMagick-6.4.1-Q16 both in local and server.

I'm invoking the command from ASP.Net page.When I tried the command in server I'm not getting any error messages but its working fine when invoked from local system using Visual Studio.

Perhaps differences in IM versions. 6.4 is very ancient. IM is not at 6.8 so about 400 versions old