[HELP] Fragments disappear in hand-drawn animation

[Selur]

a. got no recommendation, parameters have to be adjusted
b. you also can use line darkening filters you thicken and darken black lines

McLean -> mClean

#  +++ Description +++
# Typical spatial filters work by removing large variations in the image on a small scale, reducing noise but also making the image less
# sharp or temporally stable. mClean removes noise whilst retaining as much detail as possible, as well as provide optional image enhancement

# mClean works primarily in the temporal domain, although there is some spatial limiting
# Chroma is processed a little differently to luma for optimal results
# Input must be 8-bit Planar type (YV12, YV16, YV24) or their equivalents in 10, 12, 14, or 16 bits
# Chroma processing can be disabled with chroma=false

#  +++ Artifacts +++
# Spatial picture artifacts may remain as removing them is a fine balance between removing the unwanted artifact whilst not removing detail
# Additional dering/dehalo/deblock filters may be required, but should ONLY be uses if required due the detail loss/artifact removal balance

#  +++ Sharpening +++
# Applies a modified unsharp mask to edges and major detected detail. Range of normal sharpening is 0-20, the default 10. There are 4 additional
# settings, 21-24 that provide 'overboost' sharpening. Overboost sharpening is only suitable typically for high definition, high quality sources.
# Actual sharpening calculation is scaled based on resolution.

# +++ ReNoise +++
# ReNoise adds back some of the removed luma noise. Re-adding original noise would be counterproductive, therefore ReNoise modifies this noise
# both spatially and temporally. The result of this modification is the noise becomes much nicer and it's impact on compressibility is greatly
# reduced. It is not applied on areas where the sharpening occurs as that would be counterproductive. Settings range from 1 to 20, default
# value is 14. The strength of renoise is affected by the the amount of original noise removed and how this noise varies between frames. It's
# main purpose is to reduce the 'flatness' that occurs with any form of effective denoising.

# +++ Deband +++
# This will perceptibly improve the quality of the image by reducing banding effect and adding a small amount of temporally stabilised grain to
# both luma and chroma. The settings are not adjustable as the default settings are suitable for most cases without having a large effect on
# compressibility. Auto balance uses Autoadjust, it calculates statistics of the clip, stabilises temporally and adjusts luminance gain & colour
# balance of the noise reduced clip.
# 0=disabled, 1=deband only, 2=auto balance only, 3=both deband and auto balance, 4=deband and veed, 5=all

# +++ Depth +++
# This applies a modified warp sharpening on the image that may be useful for certain things, and can improve the perception of image depth. Default
# is 0 (disabled), and ranges up to 5. This function will distort the image, for animation a setting of 1 or 2 can be beneficial to improve lines. The
# effect

# +++ Strength +++
# The strength of the denoising effect can be adjusted using this parameter. It ranges from 20 percent denoising effect with strength 1, up to the
# 100 percent of the denoising with strength 20 (default). This function works by blending a scaled percentage of the original image with the processed
# image.

# +++ Outbits +++
# Specifies the bits per component (bpc) for the output for processing by additional filters. It will also be the bpc that mClean will process.
# By default, mClean processes as 12 bits if the input is 8 bit, and converts back to 8 bit. If the input is 10 bits or higher no conversion is
# done unless outbits is specified and is different to the input bpc. If you output at a higher bpc keep in mind that there may be limitations

Cu Selur