Hello, the OOXML format has the attribute 'thresh' in <a:biLevel> element for specifying the threshold value for luminance in black/white effect for images.
Right now, LibreOffice just ignores this attribute as the threshold is hardcoded to 50% here https://opengrok.libreoffice.org/xref/core/vcl/source/gdi/bitmap3.cxx?r=f93a345a#253 However, MSO allows the users to change the threshold to 25% or 75%, so when LibreOffice imports those images, they have a 50% threshold and it causes https://bugs.documentfoundation.org/show_bug.cgi?id=105380 My question is, once the value is parsed in https://opengrok.libreoffice.org/xref/core/oox/source/drawingml/fillproperties.cxx?r=09cd0e36#750, what would be the best way to have it in vcl ? should I just do the same we do with luminance or contrast and have a property called 'AdjustThreshold' or is there any other easier way to do it? I'm asking because luminance and contrast are used throughout the code and this solution seems like using a sledgehammer to crack a nut as the threshold value won't be used anywhere else. Regards -- Xisco Faulí Libreoffice QA Team IRC: x1sc0
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