A PNG file can also store an alpha value for each pixel, which specifies the degree to which the color of that pixel is blended with the background color.是什么意思_A PNG file can also store an alpha value for each pixel, which specifies the degree to which the color of that pixel is blended with the background color.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句