颜色与背景 meaning in English

colors and background

When you fill a semitransparent shape , the color of the shape is blended with the colors of the background
在填充半透明形状时，形状的颜色与背景的颜色相混合。
The alpha value indicates the transparency of the color the extent to which the color is blended with the background color
Alpha值指示颜色的透明度，即颜色与背景色的混合程度。
Even worse , if the text color and background color are close to each other , the printout may be impossible to read
更糟糕的是，如果文本颜色与背景颜色接近，打印内容会难以阅读。
When you draw a semitransparent line over a background , the color of the line is blended with the colors of the background
在背景上绘制半透明的线条时，线条的颜色与背景的颜色相混合。
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
Png文件还可为每个像素存储一个alpha值，该值指定了该像素颜色与背景颜色混合的程度。