PerlMagick Scene attribute

BrentD has asked for the wisdom of the Perl Monks concerning the following question:

I am trying to use PerlMagick to convert PDFs into multiple TIFF images. For the most part everything is working, except for the file numbering. Normally I'd just call

'convert -density 240x240 -compress Group4 -scene 15 test.pdf testp%04d.tif'

to get files tiffp0015.tif though testp0018.tif (for a 4-page PDF). I tried to translate this into PerlMagick with the following code:

#!/usr/bin/perl
use strict;
use warnings;
use Image::Magick;

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

my $filename = "test.pdf";

$image->Read($filename);
$image->Set(scene=>15);
$image->Write(filename=>"testp%04d.tif",
              compression=>'Group4',
              density=>"240x240");
[download]

but it is still outputting testp0000.tif - testp0003.tiff

How do I get it to start with the correct scene number?

Comment on PerlMagick Scene attribute Select or Download Code

Replies are listed 'Best First'.
Re: PerlMagick Scene attribute by syphilis (Archbishop) on Sep 26, 2017 at 23:01 UTC
Have you tried: `$image->Write(filename=>"testp%04d.tif", compression=>'Group4', density=>"240x240", scene=>15);` [download] Untested. Cheers, Rob	[reply] [d/l]
Re^2: PerlMagick Scene attribute by BrentD (Sexton) on Sep 27, 2017 at 15:30 UTC
Yes. Also tried the following variants with the same result: Variant 1: `$image->Read($filename); $image->[0]->Set(scene=>15); $image->Write(filename=>"testp%04d.tif", compression=>'Group4', density=>"240x240");` [download] Variant 2: `$image->Read($filename); $image->Write(filename=>"testp%04d.tif", compression=>'Group4', density=>"240x240", scene=>15);` [download] And just in case the order of attributes made a difference in the "Write" command: Variant 3: `$image->Read($filename); $image->Write(scene=>15, filename=>"testp%04d.tif", compression=>'Group4', density=>"240x240");` [download]	[reply] [d/l] [select]
Re: PerlMagick Scene attribute by BrentD (Sexton) on Sep 27, 2017 at 15:50 UTC
So, trying to narrow down the problem I wanted to verify that "scene" is in fact getting set: `#!/usr/bin/perl use strict; use warnings; use Image::Magick; unlink (glob("*.tif")); my $image = Image::Magick->new; my $filename = "test.pdf"; $image->Read($filename); my $p = $image->Get('scene'); print "\n\nScene1: $p\n"; $image->Set(scene=>15); $p = $image->Get('scene'); print "Scene2: $p\n\n"; $image->Write(filename=>"testp%04d.tif", compression=>'Group4', density=>"240x240");` [download] My output is: `Scene1: 0 Scene2: 15` [download] So it appears as if "scene" is being properly set, but that it's being ignored by the Write method.	[reply] [d/l] [select]
Re^2: PerlMagick Scene attribute by Anonymous Monk on Sep 28, 2017 at 00:57 UTC
`$image[14]->Write...`?	[reply] [d/l]
Re^3: PerlMagick Scene attribute by afoken (Chancellor) on Sep 28, 2017 at 04:49 UTC
Inventing a new syntax won't fix the problem. There is no `@image` array around. Alexander -- Today I will gladly share my knowledge and experience, for there are no sweeter words than "I told you so". ;-)	[reply] [d/l]
Re^4: PerlMagick Scene attribute by Anonymous Monk on Sep 29, 2017 at 00:46 UTC
Re^5: PerlMagick Scene attribute by afoken (Chancellor) on Oct 01, 2017 at 10:48 UTC
Some notes below your chosen depth have not been shown here
Re: PerlMagick Scene attribute by Anonymous Monk on Sep 26, 2017 at 23:16 UTC
Have you tried passing "scene => 15" to ->Set? Also, are you sure compression and compress are related?	[reply]
Re^2: PerlMagick Scene attribute by BrentD (Sexton) on Sep 27, 2017 at 15:33 UTC
Yes, according to the API spec at https://www.imagemagick.org/script/perl-magick.php the compression attribute is the same as -compress. The 4 TIFF files that it outputs have the correct compression, just the wrong filenames.	[reply]


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