Custom libvips with ImageMagick 7 throws Input file contains unsupported image format. But vipsthumbnail handles the same images perfectly.

[haritonstefan]

I'm trying to build a libvips from source with poppler and image magick, as I need to create .png thumbnails for BMP, PDF, PSD file formats.
After building, vipsthumbnail correctly creates thumbnails for BMP, WEBP, PDF, PSD. But if being used through sharp, it only handles PDF and WEBP, and raises Error: Input file contains unsupported image format for BMP and PSD.
I made this repo to reproduce the described behaviour.

1. Yes to both.
   

2. I've made a repo reproducing the issue: sharp-custom-vips

3. The expected behavior is to have the thumbnails generated

4. Provided the link in answer no. 2

5. Yes, samples are inclued in the repo

6. npx envinfo --binaries --system

npx: installed 1 in 0.897s

  System:
    OS: Linux 5.4 Alpine Linux
    CPU: (12) x64 Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz
    Memory: 367.82 MB / 15.34 GB
    Container: Yes
    Shell: 1.31.1 - /bin/ash
  Binaries:
    Node: 12.18.2 - /usr/local/bin/node
    Yarn: 1.22.4 - /usr/local/bin/yarn
    npm: 6.14.5 - /usr/local/bin/npm

[lovell]

Support for libvips compiled against ImageMagick 7 was added recently via #2258 and will be in the next release.

[haritonstefan]

Thank you @lovell for your answer.

[lovell]

v0.26.0 now available.