diff -r d7895e68fa21 -r 9400ab00cbfc PNGReader.st
--- a/PNGReader.st	Fri Jan 12 22:10:59 2018 +0100
+++ b/PNGReader.st	Tue Jan 16 16:20:36 2018 +0100
@@ -1,3 +1,5 @@
+"{ Encoding: utf8 }"
+
 "
  COPYRIGHT (c) 1996 by Claus Gittinger
               All Rights Reserved
@@ -53,6 +55,11 @@
         writer can only store mask with depth24 images (for now).
         writer only generates unfiltered non-interlaced data.
         
+    [Special:]
+        the EnforcedImageTypeQuery is asked for;
+        if #rgb is returned AND the image is rgba, then the alpha channel is ignored
+        and an rgb (Depth24Image) is returned instead.
+
     [See also:]
         Image Form Icon
         BlitImageReader FaceReader GIFReader JPEGReader PBMReader PCXReader 
@@ -526,6 +533,9 @@
             ^ false.
         ].
         photometric := #rgba.
+        ImageReader::EnforcedImageTypeQuery query == #rgb ifTrue:[
+            photometric := #rgb
+        ].
         samplesPerPixel := 4.
         bitsPerSample := Array with:bitsPerChannel with:bitsPerChannel with:bitsPerChannel with:bitsPerChannel.
         depth := bitsPerChannel * 4.