Photoshop Photo filter math -

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Photoshop Photo filter math -

photoshop has nice feature called photofilter (adjustments > photo filter). i've tried understand math behind no luck. it's not standard blending , not multiplication. applying specific filter white image i've found has non-linear behavior different each channel. 1 has suggestions ideas how mimic color photo filters? thanks

here few javascript libraries filter effects:

loupe.js grayscaler alphajpeg

math photoshop

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