ImageMagick: No decode delegate for this image format `' @ error/constitute.c/ReadImage/504

image bash macos imagemagick imagemagick-convert
Montag picture Montag · Jun 2, 2016 · Viewed 50.7k times · Source

Problem: ImageMagick convert is unable to crop image. It looks like it doesn't recognize the image type?

What I've Tried:

I've searched around online and I've seen several similar issues but not mine. I've attempted their solutions including

  • Uninstalling and reinstalling ImageMagick via brew.
  • identify -list format (JPEG, GIF, PNG, TIFF, etc were all there and all had rw permissions)
  • convert -version (png is is among the built-in delegates)
  • convert pic1.png pic1-jpg.jpg (this worked fine)
  • convert pic1-jpg.jpg pic1-jpg.jpg (this worked fine)
  • convert pic1-jpg.jpg 805X972+34+94 pic1-jpg-crop.jpg (this gave the same error as for png as shown below)

 

I'm working on Mac OSX El Capitan and everything else in terminal works fine. ImageMagick was already installed.

When I run:

$ convert /Users/Innovate/Desktop/crop/2015-04-26-GinaDate13_487.png 805X972+34+94 /Users/Innovate/Desktop/crop/2015-04-26-GinaDate13_487-cropped.png

I get:

convert: unable to open image `805X972+34+94': No such file or directory @ error/blob.c/OpenBlob/2702.

convert: no decode delegate for this image format `' @ error/constitute.c/ReadImage/504.

no decode delegate for this image format `' @ error/constitute.c/ReadImage/504

In the other posts on this issue, people get

convert no decode delegate for this image format `PNG'

Or similar (except with their image type or filename and image type)

 

However, mine doesn't say anything about image file type...

I have not tried uninstalling ImageMagick then installing it manually from sources because I'm not very confident at doing that... (this solution was shown: https://stackoverflow.com/a/34633084/5398660 )

Does anyone know what might be going on?

Also, can anyone help me interpret the @ error/constitute.c/ReadImage/504 part? I'm looking at the code for constitute.c but I'm not sure if I can get useful information from it to solve my problem (I only know a bit of C)

Thank you!

Answer

cfphpflex picture cfphpflex · Feb 25, 2018 
brew remove imagemagick //to delete current version
brew install imagemagick --build-from-source

fixed it for me on mac

Related questions

How can I convert a series of images to a PDF from the command line on linux?

I have a scanning server I wrote in cgi/bash and want to be able to convert a bunch of images (all in one folder) to a pdf from the command line. How can that be done?

Read More
Batch resize images into new folder using ImageMagick

I have a folder of images over 4MB - let's call this folder dsc_big/. I'd like to use convert -define jpeg:extent=2MB to convert them to under 2MB and copy dsc_big/* to a folder dsc_small/ that …

Read More
Batch process .png to .webp

I have around 100 .png images, and all of them have to be converted to .webp (Google's image format). I am using Google's CLI tool. Any idea how to batch process them.

Read More