diff --git a/graf2d/asimage/src/TASImage.cxx b/graf2d/asimage/src/TASImage.cxx
index 1ad74266445bce3a205450606332ff084aa09ce8..f5d77f49506b0aa4c66feab5d0cb71536f6825cf 100644
--- a/graf2d/asimage/src/TASImage.cxx
+++ b/graf2d/asimage/src/TASImage.cxx
@@ -6047,8 +6047,8 @@ Bool_t TASImage::SetImageBuffer(char **buffer, EImageFileTypes type)
    params.width = 0;
    params.height = 0 ;
    params.filter = SCL_DO_ALL;
-   params.gamma = 1;
-   params.gamma_table = 0;
+   params.gamma = SCREEN_GAMMA;
+   params.gamma_table = nullptr;
    params.compression = 0;
    params.format = ASA_ASImage;
    params.search_path = 0;