diff --git a/ext/media/media_engine.php b/ext/media/media_engine.php
index 5f1d8a39..bb10ae1e 100644
--- a/ext/media/media_engine.php
+++ b/ext/media/media_engine.php
@@ -55,6 +55,7 @@ abstract class MediaEngine
             MimeType::GIF,
             MimeType::JPEG,
             MimeType::PNG,
+            MimeType::PPM,
             MimeType::PSD,
             MimeType::TIFF,
             MimeType::WEBP,
diff --git a/ext/mime/file_extension.php b/ext/mime/file_extension.php
index 0f093fab..e570ae4d 100644
--- a/ext/mime/file_extension.php
+++ b/ext/mime/file_extension.php
@@ -46,6 +46,7 @@ class FileExtension
     public const PHP5 = 'php5';
     public const PNG = 'png';
     public const PSD = 'psd';
+    public const PPM = 'ppm';
     public const MOV = 'mov';
     public const RSS = 'rss';
     public const SVG = 'svg';
diff --git a/ext/mime/mime_map.php b/ext/mime/mime_map.php
index a434f782..23245ae4 100644
--- a/ext/mime/mime_map.php
+++ b/ext/mime/mime_map.php
@@ -144,6 +144,11 @@ class MimeMap
             self::MAP_EXT => [FileExtension::PNG],
             self::MAP_MIME => [MimeType::PNG],
         ],
+        MimeType::PPM => [
+            self::MAP_NAME => "Portable Pixel Map",
+            self::MAP_EXT => [FileExtension::PPM],
+            self::MAP_MIME => [MimeType::PPM],
+        ],
         MimeType::PSD => [
             self::MAP_NAME => "PSD",
             self::MAP_EXT => [FileExtension::PSD],
diff --git a/ext/mime/mime_type.php b/ext/mime/mime_type.php
index eec112c9..99667a52 100644
--- a/ext/mime/mime_type.php
+++ b/ext/mime/mime_type.php
@@ -38,6 +38,7 @@ class MimeType
     public const PDF = 'application/pdf';
     public const PHP = 'text/x-php';
     public const PNG = 'image/png';
+    public const PPM = 'image/x-portable-pixmap';
     public const PSD = 'image/vnd.adobe.photoshop';
     public const QUICKTIME = 'video/quicktime';
     public const RSS = 'application/rss+xml';
@@ -242,6 +243,9 @@ class MimeType
                     case FileExtension::ANI:
                         $output = MimeType::ANI;
                         break;
+                    case FileExtension::PPM:
+                        $output = MimeType::PPM;
+                        break;
 // TODO: There is no uniquely defined Mime type for the cursor format. Need to figure this out.
 //                    case FileExtension::CUR:
 //                        $output = MimeType::CUR;
diff --git a/ext/transcode/main.php b/ext/transcode/main.php
index 8eb8b016..7fb9b92d 100644
--- a/ext/transcode/main.php
+++ b/ext/transcode/main.php
@@ -22,6 +22,7 @@ class TranscodeImage extends Extension
         "ICO" => MimeType::ICO,
         "JPG" => MimeType::JPEG,
         "PNG" => MimeType::PNG,
+        "PPM" => MimeType::PPM,
         "PSD" => MimeType::PSD,
         "TIFF" => MimeType::TIFF,
         "WEBP" => MimeType::WEBP