Is there an equivalence of MapRGB for a BufferedImage in Java?
I'm trying to color individual pixels in a BufferedImage
(TYPE_INT_RGB) using setRGB()
, but I'm not sure how to format the RGB values. I want the result as a single integ开发者_Python百科er. Is there a method that will take three int
values (red, green, blue) and return a correctly formatted integer for setRGB()
?
new Color(red, green, blue).getRGB();
Assuming you have ints r
, g
, and b
, you can do:
int pixel = (r << 16) | (g << 8) | b;
This is because pixels in a BufferedImage
are 4-byte ints. The 4-bytes represent Alpha, Red, Green, and Blue, in that order. So, if you shift red left by two bytes and green left by one byte, then bitwise-or r
, g
, and b
, you will get a valid pixel to use with setRGB()
.
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