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--- pmann [2023/01/16 15:20] – [The Pathomation ANNotation interface] angelos
+++ pmann [2023/01/16 15:22] (current) – [The Pathomation ANNotation interface] angelos
@@ Line 13: / Line 13: @@
 You can get the previously set external annotations files for a slide via the [[https://docs.pathomation.com/pma.core.api/#/Api/Slide_GetExternalAnnotationFiles|GetExternalAnnotationFiles]] API call, which returns the array of //Name/Path// tuples for each file associated with any slide
-**Note for image overlays:**
+**Notes for image overlays:**
-When using an image as an annotation layer, PMA.core assumes that the aspect ratio of the overlay and the whole slide image are exactly the same.
+  * Image overlays should have transparency otherwise they will completely hide the whole slide image. Image formats that support alpha channel are PNG and certain TIFF configurations.
+  * When using an image as an annotation layer, PMA.core assumes that the aspect ratio of the overlay and the whole slide image are exactly the same.
 ==== Example ====