Image conversion black and white

[offline]

How can I turn a picture black and white format.

[JohannesMunk]

You asked this same question two weeks ago!

What about



image = image.convertToFormat(QImage::Format_Mono);


as aamer4yu suggested?

If you want more control look into the sourceCode in qimage.cpp. ConvertToFormat uses an Image_Converter_Map. The one to mono is called "convert_X_to_Mono", which calls "dither_to_Mono" and uses qGray (perceptual mix of RGB) and a treshold of 128.

If that's not what you are looking for, you need to elaborate more!

Johannes