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Pay attention on mat data types and convertTo params:

source.convertTo(destination, type)

Fixed code:

Mat maskColor = new Mat( mBitmapPintar.getHeight(), mBitmapPintar.getWidth(), CvType.CV_8UC3);
Mat maskgris = new Mat( maskColor.rows(), maskColor.cols(), CvType.CV_8U );
Mat mask = new Mat( maskColor.rows(), maskColor.cols(), CvType.CV_32F);

Imgproc.cvtColor( maskColor, maskgris, Imgproc.COLOR_BGR2GRAY);
Highgui.imwrite(directoriFitxer + "/maskengris.jpg", maskgris);
maskgris.convertTo(mask, CvType.CV_32F);
mask.convertTo(maskgris, CvType.CV_8U);
Highgui.imwrite(directoriFitxer + "/maskengrisDespConv.jpg", maskgris);