Re: mogrify resolution of png image: error when using PixelsPerInch unit
Anthony Thyssen <[email protected]>
| Newsgroups | gmane.comp.video.image-magick.user |
|---|---|
| Message-ID | <20091026125114.6a96ab82@wraith> |
On Sun, 25 Oct 2009 10:33:52 +0100 geo cherchetout <[email protected]> wrote: | On 24.10.2009 19:46, *[email protected]* wrote: | | > The PNG image specification accepts undefined units and pixels-per-centimeter. | > It does not support pixels-per-inch. | | OK, thank you. Perhaps even convert|mogrify converts pixels-per-centimeter | to pixels-per-meter. http://www.w3.org/TR/2003/REC-PNG-20031110/#11pHYs | | | $ mogrify -density 200x200 -units PixelsPerInch image.png | $ identify -verbose image.png | grep -A 1 Resolution | Resolution: 199.99x199.99 | Units: PixelsPerCentimeter | To me I would class the above as a bug. The -units specify that the density setting was set to pixels-per-inch so perhaps the PNG encoder should translate density to pixels-per-centimeter seeing as the PNG format does not understand pixels-per-inch. It would of course be a different matter if the -units were unspecified! Anthony Thyssen ( System Programmer ) <[email protected]> ----------------------------------------------------------------------------- HELLO, I'm a more persuasive signature virus! Join in the fun and copy me into yours! C'mon, it's really fun! And such a cool concept, too! That's it, just snip me out of this letter and append me to your .sig...PLEEEEZE?? ----------------------------------------------------------------------------- Anthony's Home is his Castle http://www.cit.gu.edu.au/~anthony/