LSB Graphics Extensions Specification
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png_set_invert_alpha

Name

png_set_invert_alpha -- invert the level of opacity of a PNG file

#include <png.h>

void png_set_invert_alpha(png_structp png_ptr);

This interface shall invert the level of opacity (alpha) of a PNG file.

The parameter png_ptr shall specify the PNG file for which to invert the opacity.

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png_set_interlace_handling	Up	png_set_invert_mono