diff --git a/docs/api.md b/docs/api.md
index 28e4c6f4..e745c6c6 100644
--- a/docs/api.md
+++ b/docs/api.md
@@ -38,7 +38,7 @@ Fast access to image metadata without decoding any compressed image data.
 
 `callback`, if present, gets the arguments `(err, metadata)` where `metadata` has the attributes:
 
-* `format`: Name of decoder to be used to decompress image data e.g. `jpeg`, `png`, `webp` (for file-based input additionally `tiff`, `magick` and `openslide`)
+* `format`: Name of decoder to be used to decompress image data e.g. `jpeg`, `png`, `webp` (for file-based input additionally `tiff`, `magick`, `openslide`, `ppm`, `fits`)
 * `width`: Number of pixels wide
 * `height`: Number of pixels high
 * `space`: Name of colour space interpretation e.g. `srgb`, `rgb`, `scrgb`, `cmyk`, `lab`, `xyz`, `b-w` [...](https://github.com/jcupitt/libvips/blob/master/libvips/iofuncs/enumtypes.c#L522)
diff --git a/docs/changelog.md b/docs/changelog.md
index 690e7f56..539418a8 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -12,6 +12,10 @@
   [#340](https://github.com/lovell/sharp/issues/340)
   [@janaz](https://github.com/janaz)
 
+* Add support for libvips' PBM, PGM, PPM and FITS image format loaders.
+  [#347](https://github.com/lovell/sharp/issues/347)
+  [@oaleynik](https://github.com/oaleynik)
+
 * Small optimisation when reducing by an integral factor to favour shrink over affine.
 
 * Add support for gamma correction of images with an alpha channel.
diff --git a/docs/index.md b/docs/index.md
index a2f7a19c..ae4287ee 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -24,7 +24,7 @@ to install the libvips dependency.
 ### Formats
 
 This module supports reading JPEG, PNG, WebP, TIFF, OpenSlide,
-GIF and other libmagick-supported formats.
+GIF and most other libmagick-supported formats.
 
 Output images can be in JPEG, PNG and WebP formats as well as uncompressed raw pixel data.
 
diff --git a/src/common.cc b/src/common.cc
index 5b7d2a58..2e25934a 100644
--- a/src/common.cc
+++ b/src/common.cc
@@ -94,6 +94,10 @@ namespace sharp {
         imageType = ImageType::OPENSLIDE;
       } else if (EndsWith(loader, "TiffFile")) {
         imageType = ImageType::TIFF;
+      } else if (EndsWith(loader, "Ppm")) {
+        imageType = ImageType::PPM;
+      } else if (EndsWith(loader, "Fits")) {
+        imageType = ImageType::FITS;
       } else if (EndsWith(loader, "Magick") || EndsWith(loader, "MagickFile")) {
         imageType = ImageType::MAGICK;
       }
diff --git a/src/common.h b/src/common.h
index e3801a7d..276567ac 100644
--- a/src/common.h
+++ b/src/common.h
@@ -15,7 +15,9 @@ namespace sharp {
     WEBP,
     TIFF,
     MAGICK,
-    OPENSLIDE
+    OPENSLIDE,
+    PPM,
+    FITS
   };
 
   // How many tasks are in the queue?
diff --git a/src/metadata.cc b/src/metadata.cc
index bcd933e2..a19877ae 100644
--- a/src/metadata.cc
+++ b/src/metadata.cc
@@ -120,6 +120,8 @@ class MetadataWorker : public AsyncWorker {
         case ImageType::TIFF: baton->format = "tiff"; break;
         case ImageType::MAGICK: baton->format = "magick"; break;
         case ImageType::OPENSLIDE: baton->format = "openslide"; break;
+        case ImageType::PPM: baton->format = "ppm"; break;
+        case ImageType::FITS: baton->format = "fits"; break;
         case ImageType::UNKNOWN: break;
       }
       // VipsImage attributes