the return of the Leica SCN reader pink image bug, for SCN files generated by the Leica FL 120 instrument

[reasonatrb]

Leica has recently release a new slide scanner hardware that outputs SCN format files, the Aperio FL 120. We just shifted over from the Aperio VERSA instrument that also outputs SCN format files.

We use Bio-Formats to make use of SCN images in ImageJ. We're working with Bio-Formats version 8.1.1.

We now see the same pink images as were earlier reported in #3510 when we attempt to open SCN files created by the Aperio FL 120 in ImageJ using Bio-Formats. The underlying reasons are likely the same, in that this is connected to the YCbCr photometric interpretation.

Looking at the PR for that earlier issue, https://github.com/ome/bioformats/pull/3562/changes it looks like the YCbCr correction is being applied or not applied in LeicaSCNReader.java according to a string related to the instrument designation. I believe that a designation for the new Leica FL 120 instrument now needs to be added to the list.

[melissalinkert]

Thanks, @reasonatrb. Would you be willing to submit at least one sample dataset from the FL 120 to the Bio-Formats community on Zenodo so that we can reproduce this issue and test any potential fixes?

[reasonatrb]

@melissalinkert I submitted a representative SCN slide scan file.

[melissalinkert]

Thank you, it has been accepted as https://zenodo.org/records/19009239.

[reasonatrb]

This patch works to fix the issue in v8.1.1.

diff --git a/components/formats-gpl/src/loci/formats/in/LeicaSCNReader.java b/components/formats-gpl/src/loci/formats/in/LeicaSCNReader.java
index 276cedf8c2..6f387eed87 100644
--- a/components/formats-gpl/src/loci/formats/in/LeicaSCNReader.java
+++ b/components/formats-gpl/src/loci/formats/in/LeicaSCNReader.java
@@ -74,7 +74,7 @@ public class LeicaSCNReader extends BaseTiffReader {
   private static final String SCHEMA_2010_10 =
     "http://www.leica-microsystems.com/scn/2010/10/01";
 
-  private static final String[] MODELS_WITHOUT_CORRECTION = {"versa", "leica scn400"};
+  private static final String[] MODELS_WITHOUT_CORRECTION = {"versa", "leica scn400", "aperio leica biosystems fl"};
 
   // -- Fields --
   LeicaSCNHandler handler;