On Sun, 18 Oct 2009 17:31:21 +0800 jinsong zhao <[email protected]> wrote:
| Hi there, | | I use `convert' to convert some figure in tiff format (in 300dpi) to png | with lower resolution: | | convert -density 30 -resize 10% input.tiff output.1.png | | and I get the output.1.png with resolution 29 dpi. it seems right. | | However, if I convert the original tiff to png with the same resolution, and | then convert the png to lower resolution png or tiff, I get different | resolution. | | convert input.tiff output.2.png | convert -density 30 -resize 10% output.2.png output.3.png | | and I get the output.3.png with resolution 76 dpi. | | If I convert the output.2.png to tiff format, | | convert -compress none output.2.png output.4.tiff | | and then | | convert -density 30 -resize 10% output.4.tiff output.5.png | | the resolution of output.5.png is 76 dpi. | | I don't know why the resolution of output.3.png and output.5.png is 76 dpi. | Any cues, comments or suggestions? Thanks! | | P.S. the original input.tiff is obtain from GIMP with no compression. | Do things in the right order. READ YOUR IMAGE FIRST -density can override the input density of an image that has NOT been read in. It depends on image format! Anthony Thyssen ( System Programmer ) <[email protected]> ----------------------------------------------------------------------------- It's how you get rid of cats. You get a 500-pound parakeet and teach it to say, "Here, kitty kitty kitty" -- Rick Cook, "Wizardry Cursed" ----------------------------------------------------------------------------- Anthony's Home is his Castle http://www.cit.gu.edu.au/~anthony/ _______________________________________________ Magick-users mailing list [email protected] http://studio.imagemagick.org/mailman/listinfo/magick-users
