Method setTransferFunction

tools/imageio/image.hpp:689–689

    uint32_t getPixelCount() const { return width * height; }
    khr_df_transfer_e getTransferFunction() const { return transferFunction; }
    void setTransferFunction(khr_df_transfer_e tf) { transferFunction = tf; }
    khr_df_primaries_e getPrimaries() const { return primaries; }
    void setPrimaries(khr_df_primaries_e nprimaries) {
        this->primaries = nprimaries;