diff --git a/lib/icc_profile.js b/lib/icc_profile.js
index cedbcf6..c48637e 100644
--- a/lib/icc_profile.js
+++ b/lib/icc_profile.js
@@ -1,12 +1,12 @@
 class ICCProfile {
-  // store profiles as data and create spaces later?
-  constructor(label, data, channels, alternate) {
+  constructor(label, data, channels, alternate, type) {
     this.label = label;
     this.data = data;
     this.channels = channels;
     this.alternate = alternate;
     this.ref = null;
     this.streamRef = null;
+    this.type = type ?? (channels === 4 ? 'cmyk' : 'rgb');
   }
 
   embed(document) {
diff --git a/lib/mixins/color_space.js b/lib/mixins/color_space.js
index 9f55931..7e00b1d 100644
--- a/lib/mixins/color_space.js
+++ b/lib/mixins/color_space.js
@@ -5,8 +5,8 @@ export default {
     this._colorProfiles = {};
   },
 
-  iccProfile(label, data, channels, alternate) {
-    const profile = new ICCProfile(label, data, channels, alternate);
+  iccProfile(label, data, channels, alternate, type) {
+    const profile = new ICCProfile(label, data, channels, alternate, type);
     profile.embed(this);
     this._colorProfiles[label] = profile;
     return this;
diff --git a/lib/write_svg.js b/lib/write_svg.js
index 99ad795..8fcffe7 100644
--- a/lib/write_svg.js
+++ b/lib/write_svg.js
@@ -689,9 +689,9 @@ export default function (doc, svg, x, y, options) {
     doc.page.xobjects[group.name] = group.xobj;
     doc.addContent('/' + group.name + ' Do');
   }
-  function docApplyMask(group) {
-    let name = 'M' + (doc._maskCount = (doc._maskCount || 0) + 1);
-    let gstate = doc.ref({
+  function docApplyAlphaMask(group) {
+    const name = 'M' + (doc._maskCount = (doc._maskCount || 0) + 1);
+    const gstate = doc.ref({
       Type: 'ExtGState',
       CA: 1,
       ca: 1,
@@ -706,6 +706,28 @@ export default function (doc, svg, x, y, options) {
     doc.page.ext_gstates[name] = gstate;
     doc.addContent('/' + name + ' gs');
   }
+  function docApplyMask(group) {
+    const name = 'M' + (doc._maskCount = (doc._maskCount || 0) + 1);
+    // backdrop should be black
+    let bc = [0, 0, 0];
+    if (doc._activeColorProfile && doc._activeColorProfile.type === 'cmyk') {
+      bc = [1, 1, 1, 1];
+    }
+    const gstate = doc.ref({
+      Type: 'ExtGState',
+      CA: 1,
+      ca: 1,
+      BM: 'Normal',
+      SMask: {
+        S: 'Luminosity',
+        G: group.xobj,
+        BC: bc,
+      },
+    });
+    gstate.end();
+    doc.page.ext_gstates[name] = gstate;
+    doc.addContent('/' + name + ' gs');
+  }
   function applyBlendMode(group, blendMode) {
     // map svg blendMode to pdf
     const key = String(blendMode || '').toLowerCase();
@@ -3297,7 +3319,7 @@ export default function (doc, svg, x, y, options) {
       this.drawChildren(true, false);
       doc.restore();
       docEndGroup(group);
-      docApplyMask(group);
+      docApplyAlphaMask(group);
     };
   };
 
@@ -3321,11 +3343,16 @@ export default function (doc, svg, x, y, options) {
       if (this.attr('maskContentUnits') === 'objectBoundingBox') {
         doc.transform(bBox[2] - bBox[0], 0, 0, bBox[3] - bBox[1], bBox[0], bBox[1]);
       }
+      const maskType = this.attr('mask-type') ?? 'luminance';
       this.clip();
       this.drawChildren(false, true);
       doc.restore();
       docEndGroup(group);
-      docApplyMask(group);
+      if (maskType === 'alpha') {
+        docApplyAlphaMask(group);
+      } else {
+        docApplyMask(group);
+      }
     };
   };
 
diff --git a/package.json b/package.json
index 5c0aaf7..46bd567 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
     "document",
     "vector"
   ],
-  "version": "0.17.56",
+  "version": "0.17.58",
   "homepage": "http://pdfkit.org/",
   "author": {
     "name": "Devon Govett",
diff --git a/types/pdfkit.d.ts b/types/pdfkit.d.ts
index e2a03a4..cbad330 100644
--- a/types/pdfkit.d.ts
+++ b/types/pdfkit.d.ts
@@ -40,6 +40,7 @@ shader(fn: () => any): any;
       data: Uint8Array | Buffer;
       channels: number;
       alternate: string | string[];
+      type?: 'cmyk' | 'rgb'
     }
 }
 
@@ -786,7 +787,7 @@ declare namespace PDFKit.Mixins {
     }
 
     interface PDFColorSpace {
-      iccProfile(label:string, data: Uint8Array | ArrayBuffer, channels: number, alternate: string|string[]): this;
+      iccProfile(label:string, data: Uint8Array | ArrayBuffer, channels: number, alternate: string|string[], type?: 'rgb'|'cmyk'): this;
     }
 
     interface PDFOutputIntent {