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来自「下载来的一个看图软件的源代码」· 代码 · 共 13 行

		if (im->trueColor) {
			a->tweencolor = gdTrueColorAlpha(im,
				(pixel * gdTrueColorGetRed(fg) + npixel * gdTrueColorGetRed(bg)) / NUMCOLORS,
				(pixel * gdTrueColorGetGreen(fg) + npixel * gdTrueColorGetGreen(bg)) / NUMCOLORS,
				(pixel * gdTrueColorGetBlue(fg) + npixel * gdTrueColorGetBlue(bg)) / NUMCOLORS,
				(pixel * gdTrueColorGetAlpha(fg) + npixel * gdTrueColorGetAlpha(bg)) / NUMCOLORS);
		} else {
			a->tweencolor = gdImageColorResolve(im,
				(pixel * im->red[fg] + npixel * im->red[bg]) / NUMCOLORS,
				(pixel * im->green[fg] + npixel * im->green[bg]) / NUMCOLORS,
				(pixel * im->blue[fg] + npixel * im->blue[bg]) / NUMCOLORS);
		}