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255 - [255*(1-0.85) + x*(2*0.85-1)]part, I don't understand how you got that formula.invert()filter, but I must say I still have no clue how you achieved that ^^feComponentTransferand you can read about this one [here] (w3.org/TR/filter-effects/#feComponentTransferElement) and if you continu reading you will end up by thisfeFunc*that is applied to the 3 colors using the [table type] (w3.org/TR/filter-effects/#valdef-type-table) --> with this you can have some clue ;)invert. The simple solution to the problem as you stated it would be tocontrast(1/(1-2*p))the image and theninvert(p)the container; those two transforms compose to the identity transform. The real reason this doesn't work is that a. colors are clipped to [0..255] after each transform and b.invertalways compresses the input range → theimgtransform (which precedesinvert) has to expand the input range and therefore will run into clipping.