remove_image_background_not_white_color_with_threshold.sh

ls Resources/*.png | perl -lne '$old = $_; s/(\@\w+)/_inverted$1/; $_ = qx(basename $_); chomp; $_ = qq(Results/$_); $s = qq(convert $old -fuzz 10% -fill none +opaque white $_); print $s; print qx($s);'

# 1. details:
# 2. take png images from directory Resources
# 3. append "_inverted" before \@ symbol.
# 4. convert $old -fuzz 10% -fill none +opaque white $new
# 5. -fuzz add threshold in 10% for white color. Which are NOT white in 10% thresholds would be removed.
# 6. -fill none should fill color with transparent color
# 7. +opaque matches color to be replaced. plus add inversion. So, +opaque matches these colors that SHOULD NOT be replaced.