如何在 PerlMagick 中将字幕居中?
在命令行上使用 ImageMagick 我可以说
convert -background '#0000' -fill white -stroke black -strokewidth 3 -gravity center -pointsize 78 -size 568x1000 caption:'Lorem ipsum etc etc' -trim +repage out.png
并产生我正在寻找的输出。我想做的是同样的事情,但在 PerlMagick 中,这样我就不必在执行各种其他步骤时继续读取和写入文件。到目前为止,
use strict;
use warnings;
use Image::Magick;
my $im = new Image::Magick;
my $e = $im->Set(
background => '#0000',
fill => 'white',
stroke => 'black',
strokewidth => 3,
gravity => 'center',
pointsize => 78,
size => '586x1000',
);
die $e if $e;
$e = $im->Read("caption:Lorem ipsum etc etc");
die $e if $e;
$e = $im->Trim();
die $e if $e;
$e = $im->Set(page=>'0x0+0+0'); # +repage
die $e if $e;
$e = $im->Write('out.png');
die $e if $e;
这就是我所得到的,其工作方式完全相同,只是生成的文本不居中。
PerlMagick 的文档几乎不存在。我将这种“阅读标题”语法基于一些 MagicWand 示例,据称这将导致文本居中。显然 PerlMagick 有所不同。
那么问题来了:在这种情况下我怎样才能让 PerlMagick 尊重重力呢?如何通过 PerlMagick 获得多行、居中和自动换行的文本?请注意,这要求我使用标题而不是注释或绘图。我宁愿避免手动每行居中,但我会考虑它。
或者,如果有人有一个自动换行、使用比例字体和注释的示例,那么这对我有用。
编辑:请注意,宝丽来的 -caption 选项虽然与我正在做的事情共享实现,但与标题不同:伪图像。如果输出与上面的示例转换命令给出的内容非常匹配,我仍然会接受使用宝丽来和 -caption 的答案。
编辑2:这是问题的一个更简单的例子。
use strict;
use warnings;
use Image::Magick;
my $im = new Image::Magick;
my $e = $im->SetAttribute(
background => '#0000',
pointsize=>12,
size => '100x100',
gravity => 'center',
);
die $e if $e;
$e = $im->ReadImage('caption:The quick brown fox jumps over the lazy dog.');
die $e if $e;
$e = $im->Write('out.png');
die $e if $e;
预期结果:文本居中。
实际结果:文本左对齐。
实际结果应该与此命令的输出相同:
convert -background '#0000' -size 100x100 -pointsize 12 -gravity center caption:'The quick brown fox jumps over the lazy dog.' out.png
通过查看 perlmagick 源代码,我看不到任何应该拦截特定 SetAttribute 调用的内容,所以我不明白为什么重力被忽略。我怎样才能让重力不被忽视呢?或者,我还能如何使用这种输出来进行自动换行和居中文本?
Using ImageMagick on the command line I can say
convert -background '#0000' -fill white -stroke black -strokewidth 3 -gravity center -pointsize 78 -size 568x1000 caption:'Lorem ipsum etc etc' -trim +repage out.png
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
use strict;
use warnings;
use Image::Magick;
my $im = new Image::Magick;
my $e = $im->Set(
background => '#0000',
fill => 'white',
stroke => 'black',
strokewidth => 3,
gravity => 'center',
pointsize => 78,
size => '586x1000',
);
die $e if $e;
$e = $im->Read("caption:Lorem ipsum etc etc");
die $e if $e;
$e = $im->Trim();
die $e if $e;
$e = $im->Set(page=>'0x0+0+0'); # +repage
die $e if $e;
$e = $im->Write('out.png');
die $e if $e;
And this works precisely the same way, except that the resulting text is not centered.
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.
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.
Alternatively, if someone has a sample of doing word wrapping and with proportional fonts and Annotate then that would work for me.
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.
EDIT 2: Here's a more minimal example of the problem.
use strict;
use warnings;
use Image::Magick;
my $im = new Image::Magick;
my $e = $im->SetAttribute(
background => '#0000',
pointsize=>12,
size => '100x100',
gravity => 'center',
);
die $e if $e;
$e = $im->ReadImage('caption:The quick brown fox jumps over the lazy dog.');
die $e if $e;
$e = $im->Write('out.png');
die $e if $e;
Expected result: The text is centered.
Actual result: The text is left-justified.
Actual result should be identical to the output of this command:
convert -background '#0000' -size 100x100 -pointsize 12 -gravity center caption:'The quick brown fox jumps over the lazy dog.' out.png
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?
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使用 Annotate() 怎么样?
How about using Annotate()?
版本:ImageMagick 6.5.7-8
更接近,但仍然不水平居中,只是垂直居中。有点没主意了...
Version: ImageMagick 6.5.7-8
Closer but still does not center horizontally, just vertically. Kinda running out of ideas...
这对我来说适用于 Ubuntu 10.04。我只看到有关“标题”与“宝丽来”效果一起使用的文档。
This works on Ubuntu 10.04 for me. I only see documentation for "caption" working with the "polaroid" effect.