no images defined @error/convert.c/ConvertImageCommand/3254

[evanaad]

My home directory contains a file 'mypic.pdf' consisting of a small image. When executing the following command from my home directory:

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convert -density 300 mypic.pdf -quality 90 mypic.png

the following error displays:

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convert: no images defined 'mypic.png' @error/convert.c/ConvertImageCommand/3254.

***

ImageMagick 7.0.6-0 Q16 x86_64 2017-06-12
macOS Sierra 10.12.5

[fmw42]

What is your platform? In IM 7 convert is replace by magick. Does that make it work? Do you have all the delegates installed, especially for libpng?

What do you get from

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magick -version

[evanaad]

> What is your platform?

macOS Sierra 10.12.5

> Do you have all the delegates installed, especially for libpng?

Don't know. How to check?

> What do you get from

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magick -version

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Version: ImageMagick 7.0.6-0 Q16 x86_64 2017-06-12 http://www.imagemagick.org
Copyright: © 1999-2017 ImageMagick Studio LLC
License: http://www.imagemagick.org/script/license.php
Features: Cipher DPC HDRI Modules 
Delegates (built-in): bzlib freetype jng jpeg ltdl lzma png tiff xml zlib

[fmw42]

How did you install it -- from source, from binary or from Macports of Homebrew. Please answer my question about what you get from

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magick -version

That will tell me what delegates you have installed. Your error is not about reading the PDF, but writing the output PNG.

Does this work:

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magick -density 300 mypic.pdf -quality 90 mypic.png

IM 7 uses magick, not convert

[evanaad]

> How did you install it -- from source, from binary or from Macports of Homebrew.

Homebrew.

> Please answer my question about what you get from

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magick -version

I already did. See my previous answer.

> Does this work:

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magick -density 300 mypic.pdf -quality 90 mypic.png

No, it doesn't. It produces the following error messages:

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magick: no images for write '-write' 'mypic.png' at CLI arg 6 @ error/operation.c/CLINoImageOperator/4771.
magick: no image to apply a property "%w" @ warning/property.c/GetMagickPropertyLetter/2561.
magick: unknown image property "%w" @ warning/property.c/InterpretImageProperties/3499.
magick: no image to apply a property "%h" @ warning/property.c/GetMagickPropertyLetter/2449.
magick: unknown image property "%h" @ warning/property.c/InterpretImageProperties/3499.
magick: no image to apply a property "%m" @ warning/property.c/GetMagickPropertyLetter/2480.
magick: unknown image property "%m" @ warning/property.c/InterpretImageProperties/3499.

Extra information

The problems occur when I execute the command from inside the Emacs text editor. When I execute it from Terminal (the macOS command-line console), the command runs successfully.

[GeeMack]

The problems occur when I execute the command from inside the Emacs text editor. When I execute it from Terminal (the macOS command-line console), the command runs successfully.

Sounds like it might be write permissions on the Emacs default directory. Try the command using the full path for your output image.

[evanaad]

> Try the command using the full path for your output image.

The same error displays but with the full path:

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convert: no images defined `/Users/evanaad/mypic.png' @ error/convert.c/ConvertImageCommand/3254.

For those not familiar with Emacs: Emacs has a built-in shell similar to Terminal. I execute the commands in it.

[Bonzo]

Did not read OP's post properly.

[evanaad]

> Sounds like it might be write permissions on the Emacs default directory.

I don't think so:

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echo "Hello, world!" > myfile.txt

works as expected.

[Bonzo]

Have you tried a different type of input file; for instance a jpg?

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magick input.jpg output.png

[evanaad]

> Have you tried a different type of input file; for instance a jpg?

I have now. The command works with input.gif and input.jpg.

[fmw42]

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Delegates (built-in): bzlib freetype jng jpeg ltdl lzma png tiff xml zlib

Your delegates do not show gslib. Do you have Ghostscript installed? Check

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gs --version

Does that return a version number and is it current?

Odd that the message is about png and not pdf!

[evanaad]

> Your delegates do not show gslib.

This is the same list of delegates as the one produced in the Terminal, and Image Magick has no problem converting pdf to png in the Terminal.

> Do you have Ghostscript installed? Check

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gs --version

When run from the Terminal, the output is

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9.21

When run from Emacs, the output is

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/bin/bash: gs: command not found

[evanaad]

I've added the path to the gs executable to the Emacs search path, by adding the following lines to my Emacs init file (~/.emacs) and restarting Emacs:

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(setenv "PATH" (concat (getenv "PATH") ":/usr/local/bin/"))
(setq exec-path (append exec-path '("/usr/local/bin/")))

Now Image Magick can convert pdf to png from Emacs, and my original problem is solved!

Thanks everyone.

[tnaughts]

I am running into a similar issue in converting a pdf into an image. I am trying to convert a pdf to a jpeg image using Rmagick. I am running into some trouble with the following code:

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pdf_link = "https://staging.shurpa.com/deliveries/BtrPsIxl/label.pdf"

file = Tempfile.new(['order', '.jpeg'])
    p pdf_link
    p file.path 
    im = ImageList.new(pdf_link)
    puts "SUPP"
    im.write(file.path.to_s)
    

I recieve this error:

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"https://staging.shurpa.com/deliveries/BtrPsIxl/label.pdf"
"/var/folders/qm/yk_w5d9545j_6wqk6100dhjm0000gq/T/order20170706-43294-
15myct1.png"

Magick::ImageMagickError: unable to open file `/var/folders/qm/yk_w5d9545j_6wqk6100dhjm0000gq/T/magick-43294MCNyzIu4Oenn': No such file or directory @ error/constitute.c/ReadImage/544from/Users/timnaughton/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rmagick-2.16.0/lib/rmagick_internal.rb:1616:in `read'

However the code works perfectly fine when I feed it this pdf_string:

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"https://shippo-delivery-east.s3.amazonaws.com/b2a3e1cd070748cd80b492aa421832a3.pdf?Signature=nf6woycGiOydPI8eSnLcq3r0tEc%3D&Expires=1530816480&AWSAccessKeyId=AKIAJGLCC5MYLLWIG42A"

Version: ImageMagick 6.9.8-10 Q16 x86_64 2017-06-12 http://www.imagemagick.org
Copyright: © 1999-2017 ImageMagick Studio LLC
License: http://www.imagemagick.org/script/license.php
Features: Cipher DPC Modules
Delegates (built-in): bzlib freetype jng jpeg ltdl lzma png tiff xml zlib