如何在Image :: Magick :: Read（）中使用IO :: Scalar？ [英] How can I use IO::Scalar with Image::Magick::Read()?

问题描述

我有一个用 GD :: Image 操纵过的图像我想做使用 Image :: Magick 进一步操作。我想避免将图像写入磁盘，因此Image :: Magick可以读取它.Image :: Magick的Read函数将接受一个文件句柄作为参数，所以我试图将它传递给IO :: Scalar我使用GD :: Image的输出创建的对象。

I have an image I have manipulated with GD::Image and I want to do further manipulations with Image::Magick. I'd like to avoid writing the image out to disk just so Image::Magick can read it in. Image::Magick's Read function will accept a filehandle as a parameter, so I'm trying to pass it an IO::Scalar object I created with the output from GD::Image.

但是，由于IO :: Scalar对象可以被视为字符串，它看起来像Image :: Magick将图像的内容解释为无法找到的文件名，Read（）失败。

However, since an IO::Scalar object can be treated as a string, it looks like Image::Magick is interpreting the contents of the image as a filename which it cannot find, and Read() fails.

是否有另一种方法可以从标量创建一个文件句柄，其行为更像常规文件句柄，或者是否有另一种更简单的方法来完成我在这里尝试做的事情？

Is there another way to create a filehandle from a scalar that behaves more like a regular filehandle, or is there another simpler way to accomplish what I'm trying to do here?

my $FH = new IO::Scalar \$image_bin;
my $magick = Image::Magick->new;
my $response = $magick->Read(file => $FH);

$ response is：

$response is:

"Exception 435: unable to open image `????': No such file or directory"

推荐答案

我认为您正在寻找 BlobToImage ：

#!/usr/bin/perl

use strict;
use warnings;

use File::Slurp;
use Image::Magick;

my $image_bin = read_file 'test.jpg', binmode => ':raw';

my $magick = Image::Magick->new;

$magick->BlobToImage( $image_bin );

$magick->Resize( geometry => '64x64' );

$magick->Write( 'test-out.jpg' );

__END__

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