Open PDF and save as image

[sidz]

Hi guys.

Am I able to open pdf and save it as an image currently?

I've tried to do a simple $image = Vips\Image::newFromFile($pathToPdf); but PHPVips through the following exception:

Similar when I tried to use vips copy "files/test.pdf[n=-1,dpi=300]" a.jpg.

I'm in the Alpine (3.21) based docker container. vips and vips-tools packages have been installed.

[jcupitt]

Hi @sidz,

libvips needs to have been built with PDF support and I guess your package has not. You can test with:

$ vips --vips-config
enable debug: false
enable deprecated: true
enable modules: true
enable C++ binding: true
enable RAD load/save: true
enable Analyze7 load: true
enable PPM load/save: true
enable GIF load: true
FFTs with fftw3: true
SIMD support with libhwy: true
ICC profile support with lcms2: true
deflate compression with zlib: true
text rendering with pangocairo: true
font file support with fontconfig: true
EXIF metadata support with libexif: true
JPEG load/save with libjpeg: true
JXL load/save with libjxl: true (dynamic module: true)
JPEG2000 load/save with libopenjp2: true
PNG load/save with spng: true
image quantisation with imagequant: true
TIFF load/save with libtiff-4: true
image pyramid save with libarchive: true
HEIC/AVIF load/save with libheif: true (dynamic module: true)
WebP load/save with libwebp: true
PDF load with poppler-glib: true (dynamic module: true)
SVG load with librsvg-2.0: true
EXR load with OpenEXR: true
WSI load with openslide: true (dynamic module: true)
Matlab load with matio: true
NIfTI load/save with niftiio: true
FITS load/save with cfitsio: true
GIF save with cgif: true
Magick load/save with MagickCore: true (dynamic module: true)

So I have:

PDF load with poppler-glib: true (dynamic module: true)

ie. I have PDF loading via libpoppler, and it's been configured as a loadable module. libvips can also use PDFium, which can be better in some circumstances.

It's also possible that your libvips has been built correctly, but is unable to find the module at runtime. You can trace startup with:

$ VIPS_INFO=1 vips copy ~/pics/nipguide.pdf x.jpg
VIPS-INFO: 15:40:51.882: VIPSHOME = /home/john/vips
VIPS-INFO: 15:40:51.882: VIPS_PREFIX = /home/john/vips
VIPS-INFO: 15:40:51.882: VIPS_LIBDIR = /home/john/vips/lib
VIPS-INFO: 15:40:51.882: prefix = /home/john/vips
VIPS-INFO: 15:40:51.882: libdir = /home/john/vips/lib
VIPS-INFO: 15:40:51.883: searching "/home/john/vips/lib/vips-modules-8.17"
VIPS-INFO: 15:40:51.883: loading "/home/john/vips/lib/vips-modules-8.17/vips-openslide.so"
VIPS-INFO: 15:40:51.884: loading "/home/john/vips/lib/vips-modules-8.17/vips-heif.so"
VIPS-INFO: 15:40:51.885: loading "/home/john/vips/lib/vips-modules-8.17/vips-jxl.so"
VIPS-INFO: 15:40:51.886: loading "/home/john/vips/lib/vips-modules-8.17/vips-poppler.so"
VIPS-INFO: 15:40:51.891: loading "/home/john/vips/lib/vips-modules-8.17/vips-magick.so"
VIPS-INFO: 15:40:51.903: threadpool completed with 2 workers
VIPS-INFO: 15:40:51.914: threadpool completed with 4 workers

It can give some clues about where it's looking and what might have gone wrong.

[kleisauke]

Did you see https://pkgs.alpinelinux.org/package/v3.21/community/x86_64/vips-poppler ?

[sidz]

Thanks both of you @jcupitt and @kleisauke for a quick reply.

@jcupitt seems like poppler-glib enabled now.

$ vips --vips-config
vips --vips-config
enable debug: false
enable deprecated: true
enable modules: true
enable cplusplus: true
enable RAD load/save: true
enable Analyze7 load/save: true
enable PPM load/save: true
enable GIF load: true
use fftw for FFTs: true
SIMD support with highway: true
accelerate loops with ORC: false
ICC profile support with lcms: true
zlib: true
text rendering with pangocairo: true
font file support with fontconfig: true
EXIF metadata support with libexif: true
JPEG load/save with libjpeg: true
JXL load/save with libjxl: true (dynamic module: true)
JPEG2000 load/save with OpenJPEG: true
PNG load/save with libspng: true
PNG load/save with libpng: false
selected quantisation package: imagequant
TIFF load/save with libtiff: true
image pyramid save with libarchive: true
HEIC/AVIF load/save with libheif: true (dynamic module: true)
WebP load/save with libwebp: true
PDF load with PDFium: false
PDF load with poppler-glib: true (dynamic module: true)
SVG load with librsvg: true
EXR load with OpenEXR: true
OpenSlide load: false (dynamic module: false)
Matlab load with libmatio: false
NIfTI load/save with niftiio: false
FITS load/save with cfitsio: true
GIF save with cgif: true
selected Magick package: MagickCore (dynamic module: true)
Magick API version: magick7
Magick load: true
Magick save: true

Unfortunately I didn't know about --vips-config before. Maybe Vips start working as I've installed some new dependencies.

Anyway with the current Vips config I'm able to open PDF.

Going to close this discussion.

[sidz]

For those who is looking a solution: In Alpine (at least 3.21) you need to install vips and poppler-glib packages