Scrolling primary color changer

Light filter means for selectively varying the color of light passing in a beam along an optical axis, comprising:

• three hue component saturation filter mans including respective elongated flexible substrate means each having a surface which has a gradient axis and includes
• a first end saturate portion having a respective subtractive primary hue filtering material distributed in a generally uniform concentration at a first end of said gradient axis;
• a second end transparent portion not having filtering material at a second end of said gradient axis;
• and
• a graded portion formed between said end portions by a plurality of successive regions having said hue filtering material in respective successive uniform concentrations, such that said filtering material has a graded average density in beam-size areas around successive points along said gradient axis in said graded portion;
• said three substrate means being movable in directions along their respective gradient axes to position selected density filtering material regions across said optical axis to be serially intersected by light in a beam from which each said component filter means filters corresponding proportions of respective complementary hues of light.

Light filter means for selectively varying the color of light passing in a beam along an optical axis, comprising:

• three hue component saturation filter means including respective flexible substrate means each having a surface which has a gradient axis and includes
• a saturate first end portion having a respective substractive primary hue filtering material in a uniform concentration region adjacent a first end of said gradient axis;
• a transparent second end portion not having filtering material in a region adjacent a second end of said gradient axis;
• and
• a patterned portion connecting said end portions and comprising a connected region-portion having multiple interstices occupied by a disjoint region-portion of multiple discrete regions extending over gradually varying proportions of beam-size areas around successive points along said gradient axis, either one of said connected region-portion and said disjoint region-portion supporting said uniform concentration of the respective selected hue filtering material, whereby said filtering material has a graded average density in said successive beam-size areas between said end portions;
• said three substrate means being concurrently movable in directions along their respective gradient axes to position selected average density filtering material areas across said optical axis to be serially intersected by light in a beam from which each said component filter means subtracts corresponding proportions of respectively complementary hues in order for said light filter means to combine proportioned saturations of the respective hues of light in the beam downstream.