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POHow can I center captions in PerlMagick?
 

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  1. POHow can I center captions in PerlMagick?
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    <p>Using ImageMagick on the command line I can say</p> <pre><code>convert -background '#0000' -fill white -stroke black -strokewidth 3 -gravity center -pointsize 78 -size 568x1000 caption:'Lorem ipsum etc etc' -trim +repage out.png </code></pre> <p>And produce the output I'm looking for. What I'd like to do is the same thing but within PerlMagick so that I don't have to keep reading and writing files as I perform various other steps. Here's what I have so far</p> <pre><code>use strict; use warnings; use Image::Magick; my $im = new Image::Magick; my $e = $im-&gt;Set( background =&gt; '#0000', fill =&gt; 'white', stroke =&gt; 'black', strokewidth =&gt; 3, gravity =&gt; 'center', pointsize =&gt; 78, size =&gt; '586x1000', ); die $e if $e; $e = $im-&gt;Read("caption:Lorem ipsum etc etc"); die $e if $e; $e = $im-&gt;Trim(); die $e if $e; $e = $im-&gt;Set(page=&gt;'0x0+0+0'); # +repage die $e if $e; $e = $im-&gt;Write('out.png'); die $e if $e; </code></pre> <p>And this works precisely the same way, except that the resulting text is not centered.</p> <p>Documentation on PerlMagick is almost nonexistent. I based this "read caption" syntax on some MagicWand examples, where it is claimed that this will result in centered text. Clearly something is different for PerlMagick.</p> <p>So, the question: How can I make PerlMagick respect gravity in this case? How do I get multi-line, centered and word-wrapped text via PerlMagick? Note that this requires that I use caption and not annotate or draw. I'd prefer to avoid manual per-line centering, but I would consider it.</p> <p>Alternatively, if someone has a sample of doing word wrapping and with proportional fonts and Annotate then that would work for me.</p> <p>EDIT: Please note that the -caption option to polaroid, though it shares implementation with what I'm doing, is not the same as the caption: pseudo-image. I would still accept an answer using polaroid and -caption if the output closely matches what is given by the example convert command above.</p> <p>EDIT 2: Here's a more minimal example of the problem.</p> <pre><code>use strict; use warnings; use Image::Magick; my $im = new Image::Magick; my $e = $im-&gt;SetAttribute( background =&gt; '#0000', pointsize=&gt;12, size =&gt; '100x100', gravity =&gt; 'center', ); die $e if $e; $e = $im-&gt;ReadImage('caption:The quick brown fox jumps over the lazy dog.'); die $e if $e; $e = $im-&gt;Write('out.png'); die $e if $e; </code></pre> <p>Expected result: The text is centered.</p> <p>Actual result: The text is left-justified.</p> <p>Actual result should be identical to the output of this command:</p> <pre><code>convert -background '#0000' -size 100x100 -pointsize 12 -gravity center caption:'The quick brown fox jumps over the lazy dog.' out.png </code></pre> <p>From looking at the perlmagick source I see nothing that should be intercepting a particular SetAttribute call, so I don't see why gravity is being ignored. How can I get gravity to not be ignored for this? Or, how else can I do word wrapped and centered text with this kind of output?</p>
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    1. COHave not tried this but I wonder if there is something here that can be reused. http://code.google.com/p/image-boxmodel/source/browse/trunk/lib/Image/BoxModel/Backend/IM.pm?r=28#95
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    2. COI will try that in a few hours when I'm home from work. My eventual workaround was to have PerlMagick perform the non-centered rendering repeatedly at different pointsizes until the resulting image is within my box size. I then call out to convert via system() and have it perform the final rendering. It uses many times the CPU power of a real native solution, however, so I'm still trying, but at least I have something I can fall back on.
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