The red, green, and blue channels in an HDR image each use 32-bits to store luminance information. HDRI stands for High Dynamic Range Image. If the red channel has 255 levels, and the same for the green and the blue, the total amount of colors that can be displayed is 256 x 256 x 256 = 16,777,216 distinct colors. That’s a lot of color and works well for most images, especially those displayed on computer monitors and smartphone screens. Okay, back to 8-bit colors, or taken together, a 24-bit image. Rather than go from 1 to 256, computers like to start counting at 0, so for 256 levels, the values go from 0 to 255.
Wait… wait, you just said there are 256 levels, what’s with 255. Ah! It’s the way computers count. Most images you deal with, jpegs, pngs, bmps or tifs store color information in three channels: red, green, and blue. Usually, these file formats allot 8 bits of storage for each channel. That means that each channel can store 256 distinct levels of brightness. If the red, green, and blue all have a value of 0, you get black. If the values are all 255, you get white. First, a couple of bits of information. To get these kinds of images, the Studio renderer uses HDR images (or HDRI) for lighting. So, what is an HDRI?
Now those images are much more interesting! And getting these looks is quite easy to do.
0 kommentar(er)
