Problem with font rendering

[zinosat]

Hi,
I'm trying to translate this bash command into c# imagemagick.net

convert -size ${$rectx}x${$recty} xc:black -box black -fill white -stroke none -font $fttf -gravity center -colorspace gray -draw "font-size $f_sz text 0,0 'A' " -depth ${bitsgraylevels} -posterize ${pixmaps_levels} +antialias -flip -crop ${curw}x${recty}+${w_off}+0 +repage GRAY:tmp_d/RBC_font_${$f_sz}

But the resulted bitmap obtained with C# is very low quality compared to the bash equivalent
The font utilized in both cases is Helvetica
This is how I translated the code in c# :

cur_bitmap.Draw(new Drawables()
                            .Density(rbc_font.descriptor.imgs_density.Y)
                            .Font(rbc_font.font_name)
                            .EnableTextAntialias()
                            .FontPointSize(rbc_font.descriptor.height_in_points)
                            .StrokeWidth(0)
                            .FillColor(MagickColors.White)
                            .Gravity(Gravity.Center)
                            .Text(0, 0, "A"));
cur_bitmap.ColorSpace = ColorSpace.Gray;
                        
cur_bitmap.AdaptiveThreshold(4, 4);
// Save the image in grayscale format                        
cur_bitmap.Depth = 1;
cur_bitmap.ColorType = ColorType.Bilevel;

Thank you in advance,
Davide

[dlemstra]

Why are you doing .Density(rbc_font.descriptor.imgs_density.Y) you are not doing that on the command line?