[magick-users] command line vs. API: postscript UGLY! HELP!

[Anthony Thyssen]

tomg at limacorp.com on  wrote...
| I have done due diligence and must admit defeat on this.  If anyone is
| knowledgeable and able to help graciously, I would very much appreciate
| it!  Please no "RTFM" or "If you had only googled X" messages, as I have
| done all due diligence and have pulled all my hair out at this point.
| Thanks to anyone who helps!
|
Read it all, and you will get the idea.

| Here goes:
|
| Given a postscript file CmdLine-orig.ps (at
| http://www.dentar.com/imagemagick for example), the following command
| lines work exactly as I want:
| convert -trim -density 100 +repage CmdLine-orig.ps CmdLine.png
| convert -trim -density 125 +repage CmdLine-orig.ps CmdLine-1.png
| convert -trim -density 150 +repage CmdLine-orig.ps CmdLine-2.png
| convert -trim -density 300 +repage CmdLine-orig.ps CmdLine.ps
|
Your lucky the above does to what you want!  You could read the image in
before you trim.

This will do it all in one command and at a much higher quality

   convert -density 600 CmdLine-orig.ps -trim +repage \
           \( +clone -resample 100  -write  CmdLine.png   +delete \) \
           \( +clone -resample 125  -write  CmdLine-1.png +delete \) \
           \( +clone -resample 150  -write  CmdLine-2.png +delete \) \
           \( +clone -resample 300  -write  CmdLine.ps    +delete \) \
           null:

See..
  Postscript to Image
    http://www.imagemagick.org/Usage/text/#postscript
  Writing an Images multiple times
    http://www.imagemagick.org/Usage/files/#write

Note writing images to postscript will generate a rasterized postscript
image rather than a resizable postscript that the origial postscript
document.  See
  A word about Vector Image formats
    http://www.imagemagick.org/Usage/formats/#vector

| The TclMagick code below give me the sizes I want, but all the crispness
| is gone.  Just doing "SetDensity" results in files whose sizes don't get
| modified from the original like I want, but resample results in
| ugliness.  Just ReadImage and WriteImage ruins the file's appearance, in
| fact.  Can anyone help?
|

The Tcl script looks is doing the same as the above.
Well almost.

You do not specify the density for the initial read of the image for
the postscript to raster image conversion (see 'word about vector
formats').  As such it is probably defaulting to 'screen density'
or only 72 dpi.   That is a major loss of quality!

| $wa1 ReadImage $TMPFILE
| $wa1 trim
| $wa1 previous

Try to find out how to set Density BEFORE the ReadImage operation.

  Anthony Thyssen ( System Programmer )    <A.Thyssen at griffith.edu.au>
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