math

• add math: mask blur

threshold

• rewrite local blur threshold method

Bicubic

fix Bicubic Resize.

fix ImthresholdGenericLoader

FreeImage: fix ImthresholdGenericLoader

Deskew

0.20210408: Filter: Deskew: PageTools_Radon

Fixed: Win32 version

0.20201128:

• Fixed: Win32 version

Filter: BiMod: componentwise

BiMod make for each color component.

RYB4 colorspace

• Colors: added RYB4 colorspace
• simplify Filer UI
• fix /0 in IMTHistBiMod

Threshold: fix histogram overflow

Threshold:

• fix histogram overflow
• color correct mod

Filter:

• added level norm size method

unified histogram

Threshold:

• unified histogram
• added 'size' method